1202.2493 (V. P. Kozhevnikov)
V. P. Kozhevnikov
We report results of photometry of the intermediate polar V515 And. The
observations were obtained over 33 nights in 2008 and 2009. The total duration
of the observations was 233 h. We clearly detected two oscillations with
periods of 465.48493\pm0.00007$ and 488.61822\pm0.00009 s, which may be the
white dwarf spin period and the orbital sideband. The semi-amplitudes of the
oscillations are 25 and 20 mmag, accordingly. The oscillation with a period of
465.48493 s has a stable smooth asymmetric pulse profile whereas the pulse
profile of the oscillation with a period of 488.61822 s reveals significant
changes from a quasi-sinusoidal shape to a shape somewhat resembling a
light-curve of an eclipsing binary. Two detected oscillations imply an orbital
period of 2.73 h. V515 And is one of the most rapidly spinning intermediate
polars with orbital periods less than 3 h and may be not in spin equilibrium.
This can be proved by future observations. For this purpose we obtained
oscillation ephemerises with a formal shelf life of about 100 yr. (a 1 sigma
confidence level).
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http://arxiv.org/abs/1202.2493
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