Spot modelling and elements of the RS CVn eclipsing binary WY Cancri

Light curves of the eclipsing binary WY Cancri obtained during 1973-74, 1976-79, and 1984-86 are analyzed. The curves are found to be affected by distortion waves due to spots on the primary component. Modeling of these distortion waves requires the assumption of three or four spot groups of differe...

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Bibliographic Details
Published in:Journal of astrophysics and astronomy 1991-09, Vol.12 (3), p.225-263
Main Authors: Rao, P. Vivekananda, Sarma, M. B. K., Rao, B. V. N. S. Prakash
Format: Article
Language:English
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Summary:Light curves of the eclipsing binary WY Cancri obtained during 1973-74, 1976-79, and 1984-86 are analyzed. The curves are found to be affected by distortion waves due to spots on the primary component. Modeling of these distortion waves requires the assumption of three or four spot groups of different temperatures, sizes, and latitudes on the surface of the hotter component. The rotational periods for the spot groups are derived along with latitudes. After removal of the distortion waves from the light curves at different epochs, the curves stay apart a different levels, suggesting a residual variation of 50 yrs or more. Unified clean normal light curves are obtained using suitable correction and the Wilson-Devinney synthetic light curve method, and absolute elements are derived. The radii of these components, whose spectral types are G5 +/- 1 V and K9 +/- 1 VB, are considerably smaller than their respective Roche lobes. Thus WY Cnc can be classified as a detached binary. (C.D.)
ISSN:0250-6335
0973-7758
DOI:10.1007/BF02702880