【学术报告】

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报告题目：　　 Wind Mass Transfer in AGB Binaries

报告人：　　　 陈卓（博士后）

报告人单位：   阿尔伯塔大学

报告时间：　　 2019年12月24日（星期二）上午10:00-11:00     

报告地点：　　 科研楼1号楼228会议室

报告语言：　    英文

报告摘要： 

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The origin of chemically peculiar stars and non-zero eccentricity in evolved close binaries have been long-standing problems in binary stellar evolution. Answers to these questions may trace back to an intense mass transfer during an AGB binary phase. In this talk, I will discuss two mass transfer modes in the AGB binaries and the transition between them. One mass transfer mode is Bondi-Hoyle-Lyttleton (BHL) accretion and the other is Wind-Roche-lobe overflow (WRLOF). We use AstroBEAR to solve radiation-hydrodynamic equations in 3D and calculate mass transfer rates in asymptotic-giant-branch (AGB) binaries with different binary separations. Accretion disks may form around the secondaries. Depending on the binary separation, a circumbinary disk or a spiral structure may appear in the simulation. The resulting mass transfer efficiency in our models is up to a factor of 8 times higher than what the standard BHL accretion scenario predicts, and the outflow gains up to 91% of its initial angular momentum when it reaches 1.3 binary separations. Consequently, some AGB binaries may undergo orbit shrinkage, and some will expand. The high mass transfer efficiency is closely related to the presence of the circumbinary disks.

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云台邀请团组：大样本恒星演化团组

邀请人：韩占文 院士

邀请方联系人：葛宏伟 0871-63924633

12月3日