VARIATION OF THE LIGHT AND PERIOD OF THE MAGNETIC CATACLYSMIC VARIABLE AM Her
Makaleler > Tam Makale · 2008
Yazarlar: Belinda Kalomeni, Kadri Yakut
The Astronomical Journal, Uluslararası, Wos, 2008, cilt 136, ss 2367-2372
DOI: 10.1088/0004-6256/136/6/2367
Özet
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, days yr −1 , with a mass transfer rate of M ☉ yr −1 , in agreement with the previous findings by a different method.