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摘要
We present new photometric observations for the eclipsing binary OF CVn, and determined five light minimum times. By using the Wilson-Devinney code, two sets of photometric solutions were deduced from our observations in 2009. The asymmetric light curves obtained on 2009 March 5 were modeled by a dark spot on the more massive component. The results indicate that OF CVn is a W-type weak-contact binary, with a mass ratio of q similar to 0.28 and an overcontact degree of f similar to 20%. From the O - C curve of minimum times, it is found that there exists a cyclic variation, whose period and semi-amplitude are P-3 = 17.2(+/- 0.9) year and A = 0.(d)0070(+/- 0.(d)0008), respectively. This kind of cyclic oscillation may possibly result from the light-time effect due to the presence of an unseen third body. This kind of additional body may extract angular momentum from the central system. The low-amplitude changes of the light curves on a short-time scale (e.g., half a month) may be attributed to the dark spot activity, which may result in angular momentum loss via magnetic breaking. With angular momentum loss, the weak-contact binary DF CVn will evolve into a deep-contact configuration.
- 出版日期2011-4
- 单位淮北师范大学
