Photometric and spectroscopic studies of the long period low mass ratio deep contact binary KN Per

Abstract

The photometric analysis and spectroscopic study of the long period low mass ratio deep contact binary KN Per were executed. The light curves of BV(RI)${}_c$-band were from the Ningbo Bureau of Education and Xinjiang Observatory Telescope (NEXT) at the Xingming Observatory. Through the analysis of Wilson-Devinney (W-D) program, KN Per was found as an A-type low mass ratio deep contact binary (q=0.236, f=53.4\%). A cool spot applied on the primary component was introduced to explain the unequal maxima of the light curve. Based on the O-C analysis, we found that the rate of the increasing orbital period is $\dot{P}$ = 5.12 $\pm$ (0.30) $\times$ 10${}^{-7}$ d/yr, meaning the mass transfer from the secondary component to the primary one. By analyzing the spectroscopic data, we detected chromospheric activity emission line indicators, which is corresponding to the light-curve analysis. 71 long period (P $>$ 0.5 days) contact binaries including our target were collected. The evolutionary states of all collected stars were investigated by the illustrations of mass-radius, mass-luminosity, and log M${}_T$ - log J${}_o$. The relations of some physical parameters were also determined. With the instability parameters of KN Per, we determined that it is a stable contact binary system at present.

20 pages, 11 figures,, and 10 tables, accepted by PASP

References in corpus (25)

• The Transiting Exoplanet Survey Satellite
• Determining stellar atmospheric parameters and chemical abundances of FGK stars with iSpec
• The first WASP public data release
• Physics Of Eclipsing Binaries. II. Towards the Increased Model Fidelity
• Modern stellar spectroscopy caveats
• Physical Properties and Catalogue of EW-type Eclipsing Binaries Observed by LAMOST
• Dynamical evolution of active detached binaries on log Jo - log M diagram and contact binary formation
• The dynamical stability of W Ursae Majoris-type systems
• A catalog of chromospherically active binary stars (third edition)
• Luminosity function of contact binaries based on the ASAS survey
• Radial Velocity Studies of Close Binary Stars. XI
• Contact binaries at the short period cut-off I. statistics and the first photometric investigations of ten totally eclipsing systems
• Radial Velocity Studies of Close Binary Stars. XII
• Radial Velocity Studies of Close Binary Stars.XIII
• Radial Velocity Studies of Close Binary Stars. XV
• New low mass ratio contact binaries in the Catalina Sky Survey
• A low-mass-ratio and deep contact binary as the progenitor of the merger V1309 Sco
• Radial Velocity Studies of Southern Close Binary Stars.II
• Physical Parameters of Some Close Binaries: ET Boo, V1123 Tau, V1191 Cyg, V1073 Cyg and V357 Peg
• Photometric analysis of overcontact binaries AK Her, HI Dra, V1128 Tau and V2612 Oph
• LAMOST Spectrograph Response Curves: Stability and Application to flux calibration
• V606 Cen: A Newly Formed Massive Contact Binary in a Hierarchical Triple System
• 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
• The Interacting Early-Type Binary V382 Cyg