Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011newa...16..173d&link_type=abstract
New Astronomy, Volume 16, Issue 3, p. 173-176.
Astronomy and Astrophysics
Astronomy
Scientific paper
We present new photometric observations for the eclipsing binary DF 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 DF CVn is a W-type weak-contact binary, with a mass ratio of q ˜ 0.28 and an overcontact degree of f ˜ 20%. From the O - C curve of minimum times, it is found that there exists a cyclic variation, whose period and semi-amplitude are P3 = 17.2(±0.9) year and A = 0.d0070(±0.d0008), 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.
Dai Hai-Feng
Yang Yuan-Gui
Yin X.-G.
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