AL Com
AL Com
Coordinates: 2000.0 R.A.= 12:32:25 Dec.= +14:20:48
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AL Com is a dwarf nova of SU UMa subtype. The outbursts of this star were
observed in years 1965, 1974, 1975, 1976, 1995 and 2000.
AL Com was observed in Ostrowik during 9 nights in the spring
of 1995. The results of this
campaign were described in one paper published in Acta Astronomica
and one note in the IAU Circ No. 6161
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CCD Photometry of Dwarf Nova AL Com in Superoutburst
Acta Astronomica , 1995, Vol. 45, pp. 385-398
Wojciech Pych and Arkadiusz Olech
Warsaw University Observatory, Al. Ujazdowskie 4, Warszawa, 00-478, Poland
May 24, 1995
Abstract:
We report a CCD optical photometry of a dwarf nova AL Com in
superoutburst. Before superhumps occurred the light curve was highly
variable with dominant periods about 41 minutes and 81.5 minutes for
different nights. The period of observed superhumps is 82.5 minutes and
seems to be stable. The first harmonic of the basic period is also
present. We detected a weak signal corresponding to period 78.1 minutes.
One of the periods 78.1 or 81.5 is suspected to be a possible signature
of orbital motion in the system.
PDF version of this paper is
available.
IAU Circ. No. 6162
AL COM
"Time-series observations of AL Com were collected with the 0.60-m
telescope (+ Tek512 CCD camera) on three nights (Apr. 10.026-10.104,
10.805-10.896, and 11.783-11.994 UT) at the Ostrowik Observatory of
Warsaw University. Observations were made in the Cousins I (first
night) and V bands. We confirm the presence of coherent periodic
light variations (cf. IAUC 6157). The best period for our entire
data set is 81.5 +/- 0.2 min. Also, the first harmonic period
(40.8 min) is clearly detectable. The peak-to-peak amplitude in
the V and I bands was about 0.05 and 0.06 mag, respectively."