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

Details 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

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011raa....11..583z&link_type=abstract

Research in Astronomy and Astrophysics, Volume 11, Issue 5, pp. 583-593 (2011).

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

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&sun;, 1.37 ± 0.02R&sun;, and 2.01 ± 0.07L&sun; and 0.40 ± 0.02M&sun;, 0.80 ± 0.01R&sun;, and 0.67 ± 0.04L&sun;, respectively. For V1128 Tau, the absolute parameters were computed to be 1.09 ± 0.03M&sun;, 1.01 ± 0.01R&sun;, and 1.34 ± 0.06L&sun; and 0.58 ± 0.01M&sun;, 0.76 ± 0.01R&sun;, and 0.91 ± 0.05L&sun;, 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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