Issue |
A&A
Volume 486, Number 2, August I 2008
|
|
---|---|---|
Page(s) | 505 - 509 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361:200809721 | |
Published online | 22 May 2008 |
Cyclic brightening in the short-period WZ Sge-type cataclysmic variable SDSS J080434.20+510349.2 *,**
1
Observatorio Astronómico Nacional SPM, Instituto de Astronomía, Universidad Nacional Autónoma de México, Ensenada, BC, México e-mail: zhar@astrosen.unam.mx
2
Centre for Astronomy, National University of Ireland, Galway, Newcastle Rd., Galway, Ireland
3
Instituto de Astronomía, Universidad Nacional Autónoma de México, D.F., México
4
Department of Astronomy, Kazan State University, Russia
5
Crimean Astrophysical Observatory, Nauchny, Ukraine
6
Bohyunsan Optical Astronomy Observatory, South Korea
Received:
4
March
2008
Accepted:
23
March
2008
Aims. We observed a new cataclysmic variable (CV) SDSS J080434.20+510349.2 to study the origin of long-term variability found in its light curve.
Methods. Multi-longitude, time-resolved, photometric observations were acquired to analyze this uncommon behavior, which has been found in two newly discovered CVs.
Results. This study of SDSS J080434.20+510349.2 concerns primarily the understanding of
the nature of the observed, double-humped, light curve and its relation to a
cyclic brightening that occurs during quiescence. The observations were obtained
early in 2007, when the object was at about , about 0.4 mag brighter than the pre-outburst magnitude. The light curve shows a sinusoidal variability with an amplitude of about 0.07 mag and a periodicity of 42.48 min, which is half of the orbital period of the system.
We observed in addition two “mini-outbursts” of the system of
up to 0.6 mag, which have a duration of about 4 days each. The “mini-outburst” has
a symmetric profile and is repeated in approximately every 32 days. Subsequent
monitoring of the system shows a cyclical behavior
of such “mini-outbursts” with a similar recurrence period. The origin
of the double-humped light curve and the periodic
brightening is discussed in the light of the evolutionary
state of SDSS J080434.20+510349.2.
Key words: stars: dwarf novae / stars: novae, cataclysmic variables / methods: observational / techniques: photometric
© ESO, 2008
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