Variation of the Light and Period of the Magnetic Cataclysmic Variable Am Her

Details Variation of the Light and Period of the Magnetic Cataclysmic Variable Am Her Variation of the Light and Period of the Magnetic Cataclysmic Variable Am Her

2008-11-04

arxiv.org/abs/0811.0568v1

Astronomy and Astrophysics

Astrophysics

14 pages, 5 figures

Scientific paper

10.1088/0004-6256/136/6/2367

Ground-based long-term optic variability of AM Her, covering the period between 2003-2008, has been conducted to study the features seen in both low and high states of the system. Low-state analysis shows the presence of short-term, low-amplitude light variations of about 0.02-0.03 mag with a mean power time between 16 s and 226 s. Brightness variations on the order of 0.7--2 mag, which could be due to the stellar activity of the component in the system, are also detected. A total of 30 years times of minimum light given in the literature are combined with nine times of minima obtained in this study. We represented the (observed--calculated) diagram by a parabolic curve and also by two broken lines. Under the assumption of a parabolic variation, we estimate an increase in period, dP/dt=7.5(1.2)x10^{-9} days yr^{-1}, with a mass transfer rate of dM/dt = 8(2)x10^{-9} M_{\odot} yr^{-1}, in agreement with the previous findings by a different method.

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