Registered participants

1. Angeloni, Rodolfo:
   "Symbiotic Stars in OGLE Data. Magellanic Cloud Systems" Show abstract
   In this contribution I will present OGLE long-term light curves of symbiotic stars in the Magellanic Cloud. By careful visual inspection and combined time-series analysis techniques, we have investigated for the first time in a systematic way the photometric properties of these systems, trying in particular to constrain the specific nature of the symbiotic giant component and to link it with the physical parameters of the binary system. We also provide first-order pulsation ephemerides that can be useful for a careful planning of any future follow-up program, either photometric or spectroscopic. Among the most interesting results, there is the discovery of a 20-year-long constant fading of Sanduleak's star, a peculiar symbiotic star known to produce the largest stellar jet ever discovered. I will finally discuss by means of direct examples the crucial need of long-term, multi-band observations for a real understanding of symbiotic and other interacting binary stars, and describe the conceptual design of a multi-band simultaneous imager for the SOAR 4m Telescope, whose advanced feasibility study I am currently leading.
2. Boffin, Henri:
   "Looking at fresh out of the oven Peculiar Red Giants" Show abstract
   The formation channel of Peculiar Red Giants and carbon dwarfs is still a matter of much debate, despite the fact that the binary channel is now clearly established as the only viable. The main issues lie in the actual process at play - common envelope, stable (wind-)Roche lobe, wind mass transfer - and their connection with symbiotic stars. Catching such objects 'fresh out of the oven", that is, while the currently invisible component is still a planetary nebula would provide invaluable understanding. Here we present several cases, recently discovered, of planetary nebulae showing carbon and s-process enhancement and discuss what we can learn about the mass transfer process.
   
   "The interferometry's view on Symbiotic Stars" Show abstract
   A fundamental question posed by symbiotic binaries, but with very wide application to a whole set of different kind of binary systems, is the process of mass transfer at play: Roche-lobe overflow (RLOF), stellar wind, or something in between, such as "wind RLOF"? Moreover, radiation pressure may also change the Roche lobe geometry, complicating things even further. To address this, it is crucial to get a good handle on the size of giants in symbiotic systems, and explain the apparent discrepancy between radius obtained by assuming synchronisation and those deduced from ellipsoidal variability. Optical interferometry is currently the only available technique which can probe directly the deformation of interacting stars. It allows to determine the size and the distortion of the giant star, as well as the orbital parameters of the systems, without any a priori on their characteristics. Here, I will show the amazing results we have already obtained thanks to interferometry and how they are fundamentally changing the game.
3. Booth, Richard:
   "RS Oph as a model for the circumstellar environment of Type Ia Supernovae progenitors" Show abstract
   Observational evidence suggests that a significant fraction of Type Ia Supernovae progenitors shape their environment prior to explosion. One popular model for the for Type Ia Supernova progenitors are recurrent novae, which can be tested by how they shape their CSM. Behaviours seen in the observations show similarities to those in the model, supporting the case for recurrent nova progenitors of at least some Type Ia Supernovae.
4. Bujarrabal, Valentin:
   "Rotating disks around binary post-AGB stars" Show abstract
   Recent observations of CO line emission have revealed the systematic presence of extended rotating disks around binary post-AGB stars. High resolution mapping of some objects have demonstrated the rotating dynamics of the equatorial disks and revealed also the existence of axial outflows. This multiple structure was found to be almost always present in certain kinds of post-AGB objects. We estimate from the observations the main properties of these components: total mass, characteristic temperature, dynamics, and, in some cases, detailed structure.
5. Corradi, Romano:
   "Surveys of the Galactic Plane" Show abstract
   Halpha imaging of the Galactic plane and the bulge provide an opportunity to improve the census of symbiotic stars in the Milky Way. We have completed the Northern part of the survey (IPHAS), from which nearly twenty new symbiotic stars have been discovered. In the meanwhile, the Southern extension of the survey (VPHAS+) has started at the 2.6mVST telescope at ESO Paranal. It will also cover a fraction of the bulge, where a large number of new symbiotic stars are waiting to be discovered. Perspectives and implications on the knowledge of the total population of symbiotic stars in the Galaxy are discussed.
6. Davis, Philip:
   "Mass Transfer and Evolution in Eccentric Binary Systems" Show abstract
   Studies of Roche lobe-overflow (RLOF) in binary systems typically assume that efficient tidal interaction causes the orbit to circularize, and the donor star to rotate synchronously with the orbital motion, by the time RLOF commences. However, mounting observational evidence, such as the detection of eccentric ellipsoidal variables, suggests that this may not always be the case. Using the state-of-the-art binary evolution code, BINSTAR, we investigate RLOF in eccentric binary systems with a giant donor star. Results are presented, showing the impact of tides, stellar rotation and mass transfer on the structure and evolution of the two stars. We also highlight the influence of stellar rotation and eccentricity on the Roche geometry, which in turn affects the mass transfer rate. Implications for post-asymptotic giant branch stars are discussed.
7. Drozd, Katarzyna:
   "Similarities and differences between V407 Cyg & RS Oph" [poster] Show abstract
   V407 Cyg and RS Oph are two similar but isolated case of objects. One can say, they are individual type of stars. During the quite state they seem to be symbiotic stars. However both of them showed nova-like outbursts in their history. We would like to look closer and compare those two unique objects.
8. Espey, Brian:
   "Ultraviolet and far-Ultraviolet Observations of Symbiotic Binaries" Show abstract
   I shall review observations of mass-loss and mass-transfer within and outside symbiotic binary systems, paying attention to UV and far-UV diagnostics of both cool and hot material, as well as the results from radio measurements of the more extended material. Observations with the Far Ultraviolet Spectroscopic Explorer and Hubble Space Telescope provide powerful diagnostics of the details of mass-loss from red giants at scales finer than can be probed by other means, and useful insights into the structure required from models, although the imminent demise of HST will limit similar work in the future. We shall report on a comparison of photoionisation simulations for a number of models with observations and their implications. On a larger scale, estimates of total mass-loss can be obtained from radio data, and tested more rigorously using the new generation of radio instruments. We will present predictions for a number of symbiotic systems.
9. Gałan, Cezary:
   "Chemical abundances in the atmospheres of the symbiotic giants" Show abstract
   TBD
10. Gładkowski, Marcin:
    "Comparison between 30 micron post-AGB sources in different galaxies" Show abstract
    Origin of 30 micron feature is still unknown. I will present the results of my research on post-AGB objects from different galaxies, which I think have 30 micron features in their Spitzer spectra. I found a photometry from several infrared surveys for each object and I made SEDs diagrams, which were necessary to fit a reasonable continuum in their spectra. This was helpful to estimate the feature strength and peak wavelength of the feature for each object.
11. Gorlova, Nadya:
    "The accretion processes in post-AGB binaries" Show abstract
    Post-AGB stars are far away and are not yet hot enough to excite their nebulae, which makes it much harder to study their circumstellar environment. Nevertheless, the studies with the Hubble Space Telescope have revealed plenty of examples of asymmetric nebulocities around post-AGB stars. This is surprising, given a spherical geometry of the wind-driven mass-loss on the AGB. It was proposed that the change in the wind morphology could be due to the presence of a companion. Indeed, new binaries have been routinely discovered among post-AGB stars. No clear evidence, however, has been presented of the process itself of the companion re-shaping the circumstellar environment, until a recent spectroscopic discovery of a pair of the wide-angle jets in the Red Rectangle nebula. The jets emanate from the companion's accretion disk and are thought to be responsible for carving the bi-conical cavity within the spherical AGB outflow. In the course of the dedicated survey with the HERMES echelle spectrograph on the Mercator telescope, we obtained, often for the first time, series of high-resolution spectra for several dozen post-AGB stars with dusty disks. In several systems we discovered a similar behavior of the Halpha profile with the orbital phase as in the Red Rectangle. We will present some observational, as well as modeling data that support the accretion jet interpretation in these systems.
12. Gromadzki, Mariusz:
    "Studies of symbiotic binaries based on publicly available data" Show abstract
    The most important difficulty connected with studies of symbiotic binaries is their very complex variability with various time-scales, from minutes to centuries. Symbiotic stars show a huge variety of physical phenomena: thermonuclear outbursts, pulsations, dust condensation and obscuration, orbital related variations, etc. Usually, good understanding of these phenomena requires observations over several decades. In this presentation we show the most interesting examples of our careful analysis of publicly available data from photometric surveys, literature and other historical data.
13. Hachisu, Izumi:
    "The UBV Color Evolution of Classical and Symbiotic Novae" Show abstract
    We found a general evolutionary course in the $U-B$ versus $B-V$ color-color diagram of classical and symbiotic nova outbursts. Novae do not follow any of three known sequences, the blackbody, supergiant, and main-sequence sequence, in the color-color diagram. In an early phase of a nova outburst, i.e., the premaximum phase, it starts from a point near the blackbody sequence and evolves downward (redward in $U-B$) toward the supergiant sequence. In the halfway it turns off into a new sequence, which is parallel to but $\Delta (U-B)\approx -0.3$ mag bluer than the supergiant sequence, and goes redward further along the new sequence. We call this "nova-giant sequence".
14. Hajduk, Marcin:
    "Planetary nebula Hen 2-260 and its variable central star" Show abstract
    We discovered the central star of the planetary nebula Hen 2-260 to be variable. The photometric monitoring of Hen 2-260 revealed non-periodic variations on a timescale of hours or days. There is no direct indication for the central star binarity in the spectrum nor for strong stellar wind. Variability is most likely caused by the pulsations of the star. The nebula is relatively dense and young. The central star is at the point to start O+ ionization (Teff ^Y= 30000K). We report the 50% increase of the [OIII] 5007A line flux between 2001 and 2012. The central star evolves to higher temperatures at the rate of (38 ± 7) K yr^-1, consistent with the post-AGB evolutionary tracks for the final mass of about 0.63Msun.
15. He, Jinhua:
    "Observed co-evolution of CO and dust around post-AGB stars" Show abstract
    A CO2-1 line survey is performed toward a sample of 58 high Galactic latitude post-AGB stars. A complete compilation of literature CO2-1 line data of all known post-AGB stars is also done to provide additional information. The integrated CO2-1 line flux to IRAS 25?m flux density ratio (CO-IR flux ratio) is defined, and its relationship with the IRAS color C23 (defined with the 25 and 60 ?m flux densities) is called a CO-IR diagram. The post-AGB stars segregate into three groups that show simple but distinct correlations on the CO-IR diagrams: groups-I, II, and III. The distinct physical characteristics such as chemical types, spectral types, binarity, circumstellar envelope expansion velocities, and post-AGB sub-types are also illustrated on the CO-IR diagram. The CO-IR diagram is proven to be a powerful tool to investigate the co-evolution of circumstellar gas and dust during the fast evolving post-AGB stage.
16. Hillen, Michel:
    "An interferometric study of the post-AGB binary 89 Herculis: a geometric and radiative transfer analysis of the optical and near-IR circumstellar environment" Show abstract
    The results of our multi-wavelength high angular resolution study of the prototypical object 89 Herculis will be presented. Several interferometric data sets, collected during the past decade, and covering optical to mid-IR wavelengths, are analysed in combination with the SED and flux-calibrated optical spectra. First, simple geometric models are applied to re-assess the energy budget of the post-AGB star and its circumstellar environment. A large fraction of the total optical flux (35-40%) turns out to be spatially resolved, with an emission region corresponding to the size of the inner rim of the circumbinary dusty disk. The latter dominates in the K-band by thermal emission, and is also compact. The optical circumstellar flux is interpreted to arise from a scattering process, and based on the geometric models two possible configurations are proposed: 1) the scatterers are located in the inner rim of the then extremely puffed-up circumbinary disk, or 2) a large fraction of the scatterers is located above the orbital plane, either in a bipolar outflow or in a kind of halo. The first configuration is further explored with MCMax radiative transfer models, from which it becomes clear that the near-IR and optical observational constraints on the emission morphology can not be reconciled within such a geometry. Therefore, we conclude that there is likely a highly collimated optically-visible bipolar outflow present in the, presumed naked, 89 Her post-AGB binary system.
17. Hinkle, Ken:
    "D-symbiotics, wind interaction, and infrared spectroscopy" Show abstract
    Near infrared spectra have been obtained for D-symbiotics including five of the six known D-type symbiotic novae. K and H band spectra originating from the photosphere of the Mira show line weakening during dust obscuration events. This is attributed to scattering and continuum emission by 1000 K dust. In the most heavily obscured system the 4.6 micron CO spectrum is formed in emission in 1000 K gas with an optically thick dust continuum. Spectral features that are typically produced in either the cool molecular region or the expanding circumstellar region of late-type stars can not be detected in the D-symbiotic novae and are weakened in normal D-symbiotic stars. This is in accord with colliding wind models for interaction between the white dwarf and Mira. Arguments are presented that the 1000 K gas and dust are not Mira circumstellar material but are in the wind interaction region of the colliding winds.
18. Iłkiewicz, Krystian
    
19. Jones, David:
    "The formation of jets in planetary nebulae: pre-CE mass transfer" Show abstract
    Mass transfer has long been believed to be important in the formation and evolution of planetary nebulae - particularly in forming axisymmetric structures. Our recent discoveries confirm this hypothesis and allow us to reconstruct the mass transfer history of these systems. I will highlight the most interesting cases, including the many objects we have identified as having formed jet-like structures during a mass transfer episode prior to the common-envelope phase. I will also discuss the importance of the growing sample of "fresh out of the oven" post-common-envelope central stars, and their importance in constraining theories of the poorly understood common-envelope phase of binary evolution.
20. Jorissen, Alain:
    "Algols, sdBs and PN central stars with long orbital periods: Challenging binary evolution" Show abstract
    The HERMES spectrograph attached to the Mercator 1.2m telescope at the Roque de los Muchachos Observatory (Raskin et al. 2011) has been very successful in delivering long-period orbits (P ~ 1000~d) for a variety of post-mass-transfer binaries previously believed to harbour only short-period systems. We will report on the long-period binaries found so far among sdB stars (Ostensen et al. 2011, 2012, Vos et al. 2012, Deca et al. 2012, Barlow et al. 2012), as well as among *He* WD + main-sequence (IP Eri) and PN + GIII (LoTr 5) systems. We will present evolutionary channels predicted by the BINSTAR code (Siess et al. 2012) to account for them.
    
    "The morphology of circumstellar envelopes around binary AGB stars" Show abstract
    We discuss the morphology of the circumstellar envelopes around the AGB binaries R Aqr, W Aql, pi1 Gru and theta Aps as probed through Herschel/PACS images, VISIR images and MIDI/VLTI observations, which probe angular scales from milliarcseconds up to a few arcminutes.
    
    "A radial-velocity monitoring of Li-rich K giants surrounded by dust" Show abstract
    We report on the results of a radial-velocity monitoring of Li-rich K giant surrounded by dust, from the de La Reza et al. sample, performed withe the HERMES spectrograph attached to the Mercator 1.2m telescope at the Roque de los Muchachos Observatory (Raskin et al. 2011).
21. Jurkic, Tomislav:
    "Properties of circumstellar dust in symbiotic Miras" Show abstract
    Symbiotic binaries with a cool Mira component are characterized by the presence of substantial dust and by the appearance of near-IR obscuration intervals. To understand such symbiotic Miras, their evolution, mutual interactions between the components and circumstellar matter, the influence of stellar winds and mass transfer mechanism, it is essential to determine the properties of circumstellar dust and their temporal evolution. We have determined the physical properties of circumstellar dust in different obscuration intervals and in different stages after the nova outburst, with special emphasis on two probably best observed symbiotic Miras, HM Sge and RR Tel. Publicly available near- and mid-IR observations were used including infrared spectra from IRAS and ISO, as well as long-term ground-based photometry from SAAO and Crimean observatory. The spectral energy distribution in the near- and mid-IR spectral range (1-15 microns) was obtained for epochs with different obscuration levels and stages of post-nova evolution. The DUSTY code was used to solve the radiative transfer through the dust and to determine the circumstellar dust properties of the inner dust regions around the Mira component. Dust temperature, maximum grain size, dust density distribution, mass-loss rate, terminal wind velocity and optical depth have been determined. We have also performed an analysis of pulsations in epochs with and without pronounced near-IR obscuration. These obscuration intervals can be fully understood by increased mass loss and by condensation of new amounts of dust near the sublimation radius which leads to the observed increased optical depth.
22. Kato, Mariko:
    "Light curve models of two eclipsing symbiotic stars: SMC3 and PU Vul" Show abstract
    PU Vul is a slow nova consisting of a WD and a RG. I will present a composite light-curve model that consists of the outbursting WD, its hot nebula, the RG and its cool winds and determine the distance and extinction. I also present a light curve model of SMC3, an eclipsing X-ray source. The V light curve can be explained as the oribtal variation of irradiated RG, and X-ray variation is explained as eclipse by swollen RG.
23. Kotnik-Karuza, Dubravka
    
24. Liimets, Tiina:
    "New insights into the jet of R Aquarii" Show abstract
    Since 1991 we have been monitoring the evolution in the plane of the sky of the jet and nebulosity of R Aquarii with the 3.6m New Technology Telescope, the 2.6m Nordic Optical Telescope and more recently with the 8m VLT. Images have been taken with narrow band filters in the [OI]6300, [OII]3728, [OIII]5007, [NII]6583, and Ha+[NII]6548,6583 emission lines. A preliminary analysis of data has highlighted complex motions in the jets. The full spatiokinematical analysis, which will also take advantage of Doppler-shift velocities from long-slit spectra, will be presented at the conference.
25. Mampaso, Antonio:
    "New symbiotic stars in the Galactic Plane from the IPHAS Survey" [poster] Show abstract
    IPHAS has surveyed a 10 degree strip around the northern Galactic Plane and measured over 200 million sources in H-alpha, R and I bands. From IPHAS and 2MASS photometry we have selected around 5000 symbiotic stars candidates and studied spectroscopically over 200 of them, discovering a score of new symbiotics and doubling the number known in that region so far. The results from a recent spectroscopic campaign with the GTC 10.4m telescope where five new symbiotic stars have been discovered are presented.
26. Mayer, Andreas:
    "The large-scale enviroments of binary AGB stars probed by Herschel" Show abstract
    Herschel observed 78 RSGs and AGB stars as part of the MESS guaranteed time key program. Among this sample are 18 physical binaries which offer an insight to the shaping mechanisms of the companion on the dusty winds of AGB stars. These interactions are crucial to understand the morphologies of the ejected envelopes during the following Planetary Nebula phase. However, the outcome of such interactions were so far mostly studied in simulations since observation facilities lacked sensitivity and resolution. In this talk, observations of the dusty environments of /o /Ceti, R Aqr, W Aql, ? Gru and ?Aps are presented which all show different wind morphologies caused by the companion.
27. Mikolajewska, Joanna:
    "On the nature of white dwarf in RS Oph" Show abstract
    TBD
28. Min, Cheulhong:
    "VERA observations of SiO masers in Symbiotic Star R Aquarii" Show abstract
    I will report my study toward symbiotic star R Aquarii (R Aqr) using multi-epoch phase-referencing VERA (VLBI Exploration of Radio Astrometry) observations. First, I will present our parallax measurement. Second, I will show preliminary results of orbital parameters using our VERA astrometry data.
29. Miszalski, Brent:
    "Mining the sky for new Galactic and Magellanic symbiotic stars" Show abstract
    We have conducted a large systematic Halpha emission line object survey for new symbiotic stars towards the Galactic Bulge. Deep spectroscopy of new Halpha emission line candidates, as well as planetary nebulae, was obtained using 2dF/AAOmega. We combined our deep spectroscopy with long-term lightcurves from the OGLE and MACHO surveys to greatly strengthen our capability to identify new symbiotics. This approach helped properly characterise several rare objects including the fourth known Galactic symbiotic carbon-Mira (P=3D410 days) and the fourth known planetary nebula central star to show R Coronae Borealis star-like dust obscuration events. In total, ~21 new symbiotics and over a dozen candidate symbiotics were identified, in addition to a variety of other objects such as novae, Wolf-Rayet and B[e] stars. We will also give an overview of similar work in the Magellanic Clouds that combines near-infrared photometry from the VISTA Magellanic Cloud (VMC) survey with OGLE lightcurves and SALT spectroscopy.
30. Mohammed, Hastyar:
    "Wind accretion in Symbiotic Binaries" Show abstract
    I will be present the results of 3-D smooth particle hydrodynamics simulations of wind accretion in symbiotic stars. The simulations incorporate stellar wind velocity profiles following various the beta-laws and with acceleration regions extending beyond the binary separation. I will present results covering the effect of wind velocity on the mass capture fraction and accretion disc formation, including disc misalignment and precession with respect to orbital plane.
31. Mróz, Przemek:
    "TBD" Show abstract
    TBD
32. Otulakowska-Hypka, Magdalena:
    "The latest look at the symbiotic star RW Hydrae" Show abstract
    TBD
33. Pavlenko, Yakiv:
    "Modelling of spectra of post-AGB of late spectral classes and related objects." Show abstract
    Problems of modelling of post-AGB giants of late spectral classes and related objects are discussed. We present some results of the determination of the fundamental parameters of some R CrB like stars and related objects from the comparison of observed and computed specrta. Our model atmospheres and spectral energy distributions are computed in the framework of classical approach non-solar anbundances are adopted. We consider the case of symbioptic spectra formed in the close binary systems WD+RG+AC.
34. Podsiadlowski, Philipp:
    "TBD" Show abstract
    TBD
35. Ragan, Elzbieta:
    "Similarities and differences between V407 Cyg & RS Oph" [poster] Show abstract
    V407 Cyg and RS Oph are two similar but isolated case of objects. One can say, they are individual type of stars. During the quite state they seem to be symbiotic stars. However both of them showed nova-like outbursts in their history. We would like to look closer and compare those two unique objects.
36. Schmidt, Mirek:
    "Circumstellar C2 in carbon-rich post-AGB star IRAS22272+5435" Show abstract
    Observations of circumstellar envelopes of post-Asymptotic Giant Branch (post-AGB) stars provide information about mass loss history during AGB phase and chemistry inside envelope after that phase. We analyse visual observations of C$_{2}$ molecule in absorption and milimeter and submilimeter observations of CO molecule in emission with the aim to determine physical and chemical conditions in the circumstellar shell of the carbon-rich post-AGB star IRAS\,22272+5435. Thermal and density structure of post-AGB shell (AGB remnant) is constrained by multi level radiative transfer modelling of CO emission lines. Chemical structure of the envelope is computed and then applied for the multi-level radiative transfer in C$_2$ for comparison with observed column densities. We estimate the column density of C$_{2}$ to be 3.2$\times$10$^{15}$ cm$^{-2}$. From the chemical model we estimate peak abundance of C$_{2}$ as 7$\times$10$^{-6}$ relative to molecular hydrogen. Excitation temperature of the lowest levels 58 K is consistent with the gas kinetic temperature from the CO modelling. C$_{2}$ molecule is a promissing tool to probe the temperature structure of the envelopes of post-AGB objects and indirectly to determine chemical abundance of acetylene.
37. Siess, Lionel:
    "Critically rotating Algols" Show abstract
    We investigate the evolution of the rotational velocity of stars in an Algol system. As expected, soon after the beginning of mass transfer, the spin of gainer reaches its critical keplerian value. In that regime, mass should not be accreted anymore unless some physical mechanisms act to spin down the star's rotation. We explore how magnetic braking, tidal interactions and the coupling between the star and its accretion disk via a boundary layer impact on the amount of mass that can be transferred to the gainer and on the evolution of the orbital parameters.
38. Sion, Edward:
    "Far Ultraviolet Spectroscopic Analyses of the Hot Components of Six Symbiotic Variables" Show abstract
    We have carried out synthetic spectral analyses of the far ultraviolet archival IUE/HST spectra of six symbiotic variables: V443 Her, LT Del, BD-21 3873, StHa190, CQ Dra and RW Hya. Two systems, LT Del and BD-21 3873, are yellow symbiotic systems which have no recorded outburst phase while V443 Her, an S-type symbiotic with an M4III companion has also never had a recorded outburst. Two other symbiotics, StHa190 and CQ Dra are more strongly interacting with an outburst history. We have studied these systems during their quiescence in order to shed light on the nature of their hot components. LT Del exhibits peculiar abundance patterns and strong and variable nebular emission while BD-21 3873 has peculiar abundances and rapidly variable bi-polar outflow, yet previous work on both systems (Skopal 2005; Munari et al. 2001) reveal no evidence of an accretion disk and negligible nebular contributions to their FUV continuum fluxes. We assumed the values of reddening for LT Del and BD-21 3873 to be E(B-V) = 0.20 (Skopal 2005). We treated the white dwarf mass and orbital inclination as free parameters in the model fitting of white dwarf photospheres and optically thick accretion disks. Our results will be reported at this conference.
39. Siódmiak, Natasza:
    "TBD" Show abstract
    TBD
40. Siviero, Alessandro:
    "A new multi-epoch spectrophotometric atlas of Symbiotic Stars: years 2003-2013" [poster] Show abstract
    authors: Siviero, A. and Munari, U. abstract: We present a multi-epoch, low resolution spectra atlas of about 40 symbiotic stars observed since 2003 with the 1.22m+B&C+CCD telescope in Asiago. The targets are essentially all known symbiotics north of -15 deg declination. The spectra are flux calibrated and typically extend from 3400 to 8000 Ang at a dispersion of 2.3 Ang/pix, which makes for an useful companion to the extensive Munari and Zwitter (2002) spectral atlas of symbiotic stars of both emispheres.
41. Stute, Matthias:
    "What can we learn from modelling jets in Symbiotic Stars" Show abstract
    TBD
42. Szczerba, Ryszard:
    "Search for Disks in Binary Systems with White Dwarf" Show abstract
    Circumstellar disks seem to be present at every stage of stellar evolution, beginning from proto-stellar cores, through evolutionary advanced stages, like first-ascent, asymptotic giant branch (AGB) stars, post-AGB objects, and ending on isolated white dwarfs (WDs). WDs are relatively recent addition to this track. The nature of disks around evolutionary advanced objects is still a matter of debate. A circumstellar disks containing dust, gas, planetesimals and asteroids orbit the star, having variety of shapes: torus, ring or pancake. Such disks provide the material for planets formation around pre-main sequence stars. We do not know yet, however, whether proto-planets can be formed in disks around evolutionary advanced stars. Therefore, understanding the creation, evolution and survival of such disks is a matter of primary importance. During this talk I will review our recent knowledge about disks around isolated white dwarfs. Additionally, I will describe our results of search for disks in binary systems with WD and discuss possible relation between them and the postulated exo-plantes on the circumbinary orbits.
43. Tsvetkova, Tatiana
    
44. Tylenda, Romek
    
45. Van Winckel, Hans:
    "A survey of Post-AGB binaries in the LMC and SMC" Show abstract
    Galactic Post-AGB stars in binaries have distinct observational properties which can be used to find similar objects in the LMC and SMC. We review the properties of Galactic post-AGB binaries and deduced from these colour-criteria which we used to obtain candidate optically bright post-AGB binaries in both the SMC and LMC. The selection is performed using a combination of colour criteria (which combines optical photometry and infrared photometry obtained by Spitzer) and luminosity criteria. We then performed a low-resolution spectral survey of all candidates. In this contribution I will review the status of this project and present the first detailed studies of individual objects. The main aim of this project is to investigate the luminosity distribution of post-AGB binaries, which will impact on our understanding of binary evolution channels with luminous components.