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Light curve solutions of six eclipsing binaries at the lower limit of periods for W UMa stars

Research in Astronomy and Astrophysics 2015年第9期15卷 1493-1503页

作者： Diana P.Kjurkchieva Dinko P.Dimitrov Sunay I.Ibryamov Department of Physics Shumen University Institute of Astronomy and National Astronomical Observatory Bulgarian Academy of Sciences

Photometric observations are presented in V and I bands of six eclipsing binaries at the lower limit of the orbital periods for W UMa stars. Three of them are newly discovered eclipsing systems. The light curve solutions reveal that all shortperiod targets are contact or overcontact binaries and six new binaries are added to the family of short-period systems with estimated parameters. Four binaries have com- ponents that are equal in size and a mass ratio near 1. The phase variability shown by the V-I colors of all targets may be explained by lower temperatures on their back surfaces than those on their side surfaces. Five systems exhibit the O＇Connell effect that can be modeled by cool spots on the side surfaces of their primary components. The light curves of V1067 Her in 2011 and 2012 are fitted by diametrically opposite spots. Applying the criteria for subdivision of W UMa stars to our targets leads to ambiguous results.

关键词： methods: data analysis -- catalogs -- stars: fundamental parameters-- stars: binaries: eclipsing: individual (1SWASP J173828.46+111150.2 1SWASPJ174310.98+432709.6 ≡ V1067 Her nsvs 11534299 nsvs 10971359 nsvs11234970 nsvs 11504202)

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