Observations and light curve solutions of a selection of middle-contact W UMa binaries

作     者：Diana Petrova Kjurkchieva Velimir Angelov Popov Doroteya Lyubenova Vasileva Nikola Ivanov Petrov 

作者机构：Department of Physics Shumen University IRIDA Observatory Rozhen NAO Institute of Astronomy and NAO Bulgarian Academy of Sciences 

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

年 卷 期：2018年第18卷第4期

页      面：105-114页

核心收录：

学科分类：0709[理学-地质学] 07[理学] 0708[理学-地球物理学] 070402[理学-天体测量与天体力学] 0825[工学-航空宇航科学与技术] 0704[理学-天文学] 

基　　金：supported partly by project DN08/20 of the Scientific Foundation of the Bulgarian Ministry of Education Science as well as by project RD 02-102 of Shumen University project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology funded by the National Aeronautics and Space Administration and the National Science Foundation 

主　　题：binaries close — binaries eclipsing — stars fundamental parameters — stars late-type 

摘      要：Photometric observations in Sloan g′and i′ bands of W UMa binaries NSVS 4340949,T-Dra0–00959,GSC 03950–00707,NSVS 4665041,NSVS 4803568,MM Peg,MM Com and NSVS4751449 are *** light curve solutions revealed that the components of each target are of G and K spectral *** binaries of the sample have middle-contact configurations whose fillout factors are within the range 0.2–*** only exception is NSVS 4751449 which is in deeper contact（fillout factor of 0.55）.It precisely obeys the relation between mass ratio and fillout factor for deep,low mass ratio overcontact *** of the eclipses of almost all targets（except MM Peg）is an occultation and their photometric mass ratios and solutions could be accepted with *** found that the target components have almost equal temperatures but differ considerably in size and *** components of the partially-eclipsed MM Peg have close *** solutions reveal that NSVS 4340949,T-Dra0–00959,NSVS 4803568 and MM Com are of W subtype while GSC 03950–00707,NSVS 4665041,MM Peg and NSVS 4751449 are of A *** subclassification is well-determined for all totallyeclipsed *** targets confirm the trends in which W-subtype systems have smaller periods and lower temperatures than A subtype binaries.