FS Aur - a new class of Cataclysmic Variables or the missing link between Intermediate Polars and SW Sex objects?

Details FS Aur - a new class of Cataclysmic Variables or the missing link between Intermediate Polars and SW Sex objects? FS Aur - a new class of Cataclysmic Variables or the missing link between Intermediate Polars and SW Sex objects?

2003-02-27

arxiv.org/abs/astro-ph/0302562v1

Astronomy and Astrophysics

Astrophysics

12 pages, 1 table, 12 figures, accepted for publication in PASP

Scientific paper

10.1086/375031

FS Aur is a known dwarf nova with an orbital period of about 85.7 minutes. It has been assumed to be a member of the SU UMa subclass of cataclysmic variables (CVs), but previous searches for superhumps and superoutburst have been unsuccessful. We conducted a series of photometric and spectroscopic observations of FS Aur during quiescence. We confirmed its short orbital period from radial velocity measurements. However, the long-term photometry revealed an unexpected result: the system also shows a distinct 0.24 mag modulation in the BVR photometric bands with a period of 205.5 min, which is 2.4 times longer than the orbital period. We discuss various possible causes for such a peculiar behavior.

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