Extremely low mass ratio contact binaries -- I. the first photometric and spectroscopic investigations of ten systems

Abstract

The photometric and spectroscopic investigations of ten contact binaries were presented for the first time. It is discovered that the mass ratios of all the ten targets are smaller than 0.15, they are extremely low mass ratio contact binaries. Seven of them are deep contact binaries, two are medium contact binaries, while only one is a shallow contact system. Five of them show O'Connell effect, and a dark spot on one of the two components can lead to a good fit of the asymmetric light curves. The orbital period studies of the ten binaries reveal that they all exhibit long-term period changes, six of them are increasing, while the others are shrinking. The LAMOST spectra were analyzed by the spectral subtraction method, and all the ten targets exhibit excess emissions in the H${}_{\alpha }$ line, indicating chromospheric activity. The evolutionary states of the two components of the ten binaries were studied, and it is found that their evolutionary states are identical to those of the other contact binaries. Based on the study of the relation between orbital angular momentum and total mass, we discovered the ten systems may be at the late evolutionary stage of a contact binary. The initial masses of the two components and the ages of them were obtained. By calculating the instability parameters, we found that the ten contact binaries are relatively stable at present.

arXiv comment19 pages, 8 figures,, and 9 tables, accepted by AJ

References in corpus (39)

• The Transiting Exoplanet Survey Satellite
• The Zwicky Transient Facility: System Overview, Performance, and First Results
• Evolution of binary stars and the effect of tides on binary populations
• The Man Behind the Curtain: X-rays Drive the UV through NIR Variability in the 2013 AGN Outburst in NGC 2617
• First Results from the Catalina Real-time Transient Survey
• The Zwicky Transient Facility: Data Processing, Products, and Archive
• The All-Sky Automated Survey for Supernovae (ASAS-SN) Light Curve Server v1.0
• Achieving better than 1 minute accuracy in the Heliocentric and Barycentric Julian Dates
• The First Data Release (DR1) of the LAMOST general survey
• V1309 Scorpii: merger of a contact binary
• The ASAS-SN Catalog of Variable Stars I: The Serendipitous Survey
• The first WASP public data release
• Automatic Determination of Stellar Atmospheric Parameters and Construction of Stellar Spectral Templates of the Guoshoujing Telescope (LAMOST)
• Physical Properties and Catalogue of EW-type Eclipsing Binaries Observed by LAMOST
• THE MINIMUM MASS RATIO OF W URSAE MAJORIS BINARIES
• Stellar Mergers Are Common
• Dynamical evolution of active detached binaries on log Jo - log M diagram and contact binary formation
• On the origin of W UMa type Contact binaries - a new method for computation of initial masses
• Photometric study and absolute parameters estimation of six totally eclipsing contact binaries
• The dynamical stability of W Ursae Majoris-type systems
• The Evolution of Cool Algols
• Self-consistent Stellar Radial Velocities from LAMOST Medium-Resolution Survey (MRS) DR7
• The short period end of the contact binary period distribution based on the All Sky Automated Survey (ASAS)
• The photometric-amplitude and mass-ratio distributions of contact binary stars
• The Photometric System of Tsinghua-NAOC 80-cm Telescope at NAOC Xinglong Observatory
• ZZ Piscis Austrinus (ZZ PsA): A bright red nova progenitor and the instability mass ratio of contact binary stars
• The first light curve modeling and orbital period change investigation of nine contact binaries around the short period cut-off
• Contact binaries at the short period cut-off I. statistics and the first photometric investigations of ten totally eclipsing systems
• The photometric system of the One-meter Telescope at Weihai Observatory of Shandong University
• Origin of W UMa-type contact binaries - age and orbital evolution
• Combined effects of tidal and rotational distortions on the equilibrium configuration of low-mass, pre-main sequence stars
• On the minimum mass ratio of W UMa binaries
• Evaluating GAIA performances on eclipsing binaries. II. Orbits and stellar parameters for V781 Tau, UV Leo and GK Dra
• LAMOST Observations in 15 \textit{K}2 Campaigns: I. Low resolution spectra from LAMOST DR6
• Photometric and Spectroscopic analysis of four contact binaries
• Photometric and period investigation of the late F-type overcontact binary II UMa
• The first photometric and spectroscopic analysis of the extremely low mass ratio contact binary NSVS 5029961
• Infrared spectroscopy of the merger candidate KIC 9832227
• Long-term photometric and low-resolution spectroscopic analysis of five contact binaries

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• BSN-VII: Photometric Light Curve Study of Three Cool, Large-Amplitude, Low Mass, W-Subtype Contact Binaries