Photometric investigation of eight ultra-short period eclipsing binaries from OGLE

作     者：Shanti Priya D. Ravi Raja P. Rukmini J. Raghu Prasad M. Vineet S.Thomas Shanti Priya D.;Ravi Raja P.;Rukmini J.;Raghu Prasad M.;Vineet S. Thomas

作者机构：Department of AstronomyOsmania UniversityHyderabad-500007TelanganaIndia The University of AkronAkronOH44325USA 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2020年第20卷第8期

页      面：113-120页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：Funding for this project was provided in part by a DST-SERB grant(Project No.EEQ/2017/000411) Government of India 

主　　题：stars:low-mass stars:evolution stars:low-mass binaries:eclipsing binaries:close 

摘      要：We performed a detailed photometric analysis of eight ultra-short period eclipsing binaries(USPEBs) using the Wilson-Devinney method. We present the modeled light curves and derived photometric solutions. The USPEBs with period(P)≤0.21 d considered in our study belong to W-subtype having shallow contact factor(f)~0.7 and later spectral types. The absolute parameters for these short-period binaries were derived applying empirical relations. We discuss the evolutionary stage of these USPEBs using the mass-radius, color-density and period-color diagrams. The objects showed poor metallicities, and some objects were even found to be existing around fully convective limits. The period distribution of USPEBs exhibited a sharp cut-off at 0.22 d;however, we observed significant deficits for our objects in the literature. We examined the statistics of USPEBs studied to date(in terms of the distribution of period, mass ratio and component temperatures of USPEBs) and observed that a dominant distribution of component temperatures for these USPEBs was towards lower temperatures.