Investigations into the thermal non-equilibrium of W UMa-type contact binaries

作     者：Xiao Xiong Liang Liu Sheng-Bang Qian 

作者机构：Yunnan Observatories Chinese Academy of Sciences Kunming 650011 China Key Laboratory of the Structure and Evolution of Celestial Objects Chinese Academy of Sciences Kunming 650216 China Center for Astronomical Mega-Science Chinese Academy of Sciences Beijing 100101 China University of Chinese Academy of Sciences Beijing 100049 China 

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5期

页      面：83-92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：partly supported by the Yunnan Natural Science Foundation(2016FB004) the Young Academic and Technology Leaders project of Yunnan Province(No.2015HB098) the National Natural Science Foundation of China(Nos.11773066,11403095 and 11325315) the Key Research Programme of the Chinese Academy of Sciences(Grant No.KGZD-EW-603) 

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

摘      要：Traditionally, some physical details（e.g., magnetic braking, energy transfer, angular momentum loss, etc.） have to be taken into consideration during investigations into the evolution of contact binaries. However, the real evolutionary processes which usually contain several of these physical mechanisms are very complicated as a result of strong interaction between components. To avoid dealing with these factors, a linear relationship is applied to the temperatures of components. It is found that the higher the mass ratio（M2/M1） of a contact system, the weaker the deviation from thermal *** this basis, a variation trend of fill-out factor（f） changing with mass ratio can be inferred, which is consistent with observations. Moreover, if we stick to this point of view, it should be natural that the number of semi-detached binaries in the predicted broken-contact phase of relaxation oscillations is less than the number in the contact phase.