The binding energy parameter for common envelope evolution  

作　　者：Chen Wang Kun Jia Xiang-Dong Li 

机构地区：[1]Department of Astronomy,Nanjing University [2]Key Laboratory of Modern Astronomy and Astrophysics(Nanjing University),Ministry of Education

出　　处：《Research in Astronomy and Astrophysics》2016年第8期71-78,共8页天文和天体物理学研究（英文版）

基　　金：funded by the National Natural Science Foundation of China(Grant Nos.11133001 and 11333004);the Strategic Priority Research Program of CAS(Grant No.XDB09000000)

摘　　要：Abstract The binding energy parameter A plays a vital role in common envelope evolution. Though it is well known that A takes different values for stars with different masses and varies during stellar evolution, it has been erroneously adopted as a constant in most population synthesis calculations. We have system- atically calculated the values of A for stars of masses 1 - 60 M by use of an updated stellar evolution code, taking into account the contribution from both gravitational energy and internal energy to the binding energy of the envelope. We adopt the criterion for the core-envelope boundary advocated by Ivanova. A new kind of A with an enthalpy prescription is also investigated. We present fitting formulae for the calculated values of various kinds of A, which can be used in future population synthesis studies.Abstract The binding energy parameter A plays a vital role in common envelope evolution. Though it is well known that A takes different values for stars with different masses and varies during stellar evolution, it has been erroneously adopted as a constant in most population synthesis calculations. We have system- atically calculated the values of A for stars of masses 1 - 60 M by use of an updated stellar evolution code, taking into account the contribution from both gravitational energy and internal energy to the binding energy of the envelope. We adopt the criterion for the core-envelope boundary advocated by Ivanova. A new kind of A with an enthalpy prescription is also investigated. We present fitting formulae for the calculated values of various kinds of A, which can be used in future population synthesis studies.

关 键 词：binaries： general -- stars： evolution -- stars： mass-loss 

分 类 号：P152[天文地球—天文学]