The Spin-up of a Star Gaining Mass in a Close Binary System on the Thermal Time Scale  

作　　者：Evgeny Staritsin 

机构地区：[1]K.A.Barkhatova Kourovka Astronomical Observatory,B.N.Yeltsin Ural Federal University,pr.Lenina 51,Ekaterinburg 620000,Russia

出　　处：《Research in Astronomy and Astrophysics》2022年第10期158-164,共7页天文和天体物理学研究（英文版）

基　　金：supported by the Ministry of Science and Education,FEUZ-2020-0030。

摘　　要：We investigate the exchange of mass in a binary system as a channel through which a Be star can receive a rapid rotation.The mass-transfer phase in a massive close binary system in the Hertzsprung-gap is accompanied by the spinning up of the accreting component.We consider a case when the mass of the accreting component increases by 1.5 times.The component acquires mass and angular momentum while in a state of critical rotation.The angular momentum of the component increases by 50 times.Meridional circulation effectively transports angular momentum inside the component during the mass-transfer phase and during the thermal timescale after the end of the mass-transfer phase.As a result of mass transfer,the component acquires the rotation typical of classical Be stars.

关 键 词：(stars:)binaries(including multiple) close-stars emission-line Be-stars rotation-stars EARLY-TYPE 

分 类 号：P15[天文地球—天文学]