2004/09/27 by S. V. Zharikov, G. H. Tovmassian, Zharikov, S. V. +7
Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0409647
2 pages, 2 figures, needs asp2004.sty, to appear in: The astrophysics of cataclysmic variables and related objects, ASP Conf. Ser., eds. J.M. Hameury and J.P. Lasota
arxiv created 2004/09/27 · arxiv updated 2009/12/01
We present simultaneous spectral and photometric observations of SDSS J123813.73-033933.0. From Ha radial velocity measurements we determined the orbital period of the system to be 0.05592+/-0.00002 days (80.53 min). The spectrum shows double Balmer emission lines flanked by strong, broad absorption, indicating a dominant contribution from the white dwarf. The photometric light curve shows complex variability. The system undergoes cyclic brightening up to 0.4 mag which are semi-periodical on short time scales with periods of the order of 7-12 hours. We also detect 40.25 min variability (~0.15 mag) in the light curve, that corresponds to half the orbital period. Its amplitude increases with the cyclic brightening of the system.