The Depletion of the Red Supergiant Envelope Radiative Zone During Common Envelope Evolution  

作　　者：Tamar Cohen Noam Soker 

机构地区：[1]Department of Physics,Technion,Haifa,3200003,Israel

出　　处：《Research in Astronomy and Astrophysics》2023年第6期252-259,共8页天文和天体物理学研究（英文版）

基　　金：supported by a grant from the Israel Science Foundation(769/20)。

摘　　要：We conduct one-dimensional stellar evolution simulations of red supergiant(RSG)stars that mimic common envelope evolution(CEE)and find that the inner boundary of the envelope convective zone moves into the initial envelope radiative zone.The envelope convection practically disappears only when the RSG radius decreases by about an order of magnitude or more.The implication is that one cannot split the CEE into one stage during which the companion spirals-in inside the envelope convective zone and removes it,and a second slower phase when the companion orbits the initial envelope radiative zone and a stable mass transfer takes place.At best,this might take place when the orbital separation is about several solar radii.However,by that time other processes become important.We conclude that as of yet,the commonly used alpha-formalism that is based on energy considerations is the best phenomenological formalism.

关 键 词：stars:massive (stars:)binaries(including multiple):close stars:mass-loss 

分 类 号：P153[天文地球—天文学]