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首页> 中文期刊> 《天文和天体物理学研究：英文版》 >Absolute parameters and physical nature of two W-UMa type binaries:V1123 Tau and V1128 Tau

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

         
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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 Atype 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 270K.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 ± 0.07L 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 ± 0.06L 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.

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