The Deep and Low-Mass-Ratio Contact Binary CSS J022914.4+044340 with A Luminous Additional Companion

Abstract

The first B-, V-, Rc-, and Ic-band light curves of CSS J022914.4+044340 are presented and analyzed. It is found that CSS J022914.4+044340 is a low mass ratio (0.198 +- 0.005) deep (63.7 +- 7.9%) contact binary, indicating that it has been already at the end evolutionary stage of tidally-locked evolution via magnetized wind. Because of the totally eclipsing character, the photometric solutions are reliable. The temperature and the metallicity are determined from the spectroscopic data as T = 5855 +- 15 K, and [Fe/H] = -0.842 +- 0.031, respectively. Based on the parallax of Gaia EDR3, the physical parameters of CSS J022914.4+044340 are estimated as M1 = 1.44 (+0.25,-0.22) solar mass, M2 = 0.29 (+0.05,-0.05) solar mass, R1 = 1.26 (+0.08,-0.06) solar radius, R2 = 0.65 (+0.03,-0.04) solar radius, L1 = 1.718 (+0.186,-0.191) solar luminosity, L2 = 0.416 (+0.039,-0.050) solar luminosity. Combined the fraction in light of the third body via the photometric solution (54%), the luminosity of the third body is estimated as 2.705 solar luminosity. The third body may be inferred as a subgiant. Thus, it is explained that why the primary component of CSS J022914.4+044340 has higher mass among the similar systems, and why its metallicity is so poor.

arXiv commentAccepted

References in corpus (25)

• Gaia Data Release 2. Summary of the contents and survey properties
• The Gaia mission
• Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties
• V1309 Scorpii: merger of a contact binary
• The Catalina Surveys Periodic Variable Star Catalog
• ULySS: A Full Spectrum Fitting Package
• Evolution in Binary and Triple Stars, with an application to SS Lac
• Contact Binaries with Additional Components.I. The Extant Data
• An Empirical UBVRIJHK Color-Temperature Calibration for Stars
• Coude-feed stellar spectral library - atmospheric parameters
• Physical Properties and Catalogue of EW-type Eclipsing Binaries Observed by LAMOST
• Contact Binaries with Additional Components. II. A Spectroscopic Search for Faint Tertiaries
• The most plausible explanation of the cyclical period changes in close binaries: the case of the RS CVn-type binary WW Dra
• Contact binaries with additional components. III. The adaptive optics detections
• The First U.S. Naval Observatory Robotic Astrometric Telescope Catalog (URAT1)
• W UMa-type Binary Stars in Globular Clusters
• Physical Properties and Evolutionary States of EA-type Eclipsing Binaries Observed by LAMOST
• Contact binaries at the short period cut-off I. statistics and the first photometric investigations of ten totally eclipsing systems
• Evolution of the progenitor binary of V1309 Scorpii before merger
• A Solar-type Stellar Companion to a Deep Contact Binary in a Quadruple System
• Contact binary stars of the W UMa type as distance tracers
• The asymptotic evolution of the stellar merger V1309 Sco: a Blue Straggler in the making?
• The first photometric analysis of the overcontact binary MQ UMa with an additional component
• Absolute Magnitude Calibration for W UMa-Type Systems Based on Gaia Data
• The contact binary V344 Lacertae: is it a triple system?