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Absolute parameters and physical nature of two W-UMa type binaries:V1123 Tau and V1128 Tau

Research in Astronomy and Astrophysics 2011年第5期11卷 583-593页

作者： Xiao-BinZhang an-binreni Chang-QingLuc Yang-PingLuo NationalAstronomicalObservatories ChineseAcademyofSciencesBeijing100012China InstituteofTheoreticalPhysics ChinaWestNormalUniversityNanchong637002China NationalAstronomicalObservatories／YunnanObservatory ChineseAcademyofSciencesKunming650011China

We present high-precision, multi-band CCD photometry of two less-studied close binaries V1123 Tau and V1128 Tau. Complete covered light curves and a number of new times of light minima of the two eclipsing systems were obtained, based on which, revised orbital elements and new ephemerides were given. By adopting the Wilson-Devinney method, the light curves were analyzed. The photometric solutions confirm the W UMa-type nature of the binary systems. With the less-massive secondary slightly cooler than the primary, V1123 Tau could be classified as an A- type contact system. While V1128 Tau is typically considered a W-type W UMa star, the surface temperature of its secondary component is determined to be absolutely higher than the primary by about 270 K. Combining with the results of radial-velocity solutions, we determined absolute parameters of the two systems. The mass, radius and luminosity for each component of V1123 Tau were derived as： 1.36 ±0.05M⊙, 1.37 ± 0.02R⊙, and 2.01± O.07L⊙ and 0.40±0.02M⊙, 0.80±0.01R⊙, and 0.67±0.04L⊙, respectively. For V1128 Tau, the absolute parameters were computed to be 1.09±0.03M⊙, 1.01±0.01R⊙, and 1.34±0.06Le and 0.58 ± 0.01M⊙, 0.76±0.01R⊙, and 0.91±0.05L⊙, respectively. Based on these results, the evolutionary status and the physical nature of the two binary systems are discussed, while also connecting with the theoretical models.

关键词： binaries: eclipsing-stars: late-type-stars: activity -stars: individ-ual (V1123 Tau Vl128 Tau)

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