【学术报告】
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报告题目：Helium Stars, Heavy Metals, High Velocities and Explosions

报告人：Professor C. Simon Jeffery

报告人单位：Armagh Observatory（英国阿马天文台)

报告时间：2018年11月26日（星期一）上午10:00-11:00

报告地点：主楼427会议室

报告语言：英文

报告摘要： 

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The term “hot subdwarf” refers to stars which are smaller than hydrogen-burning main-sequence stars and larger than white dwarfs. It includes stars in several different advanced stages of evolution. Most of these have surfaces severely depleted in either hydrogen or helium; some explanation exists for most of these. My talk will review the general properties of helium-poor and helium-rich subdwarfs.

I will introduce the extremely rare “intermediate helium subdwarfs”, which pose significant challenges. Several show extraordinary suface abundances of the heavy metals zirconium, yttrium , strontium, germanium and lead. All of these stars are on high-energy galactic orbits. Two pulsate in modes which, until now, were though to be impossible. I shall present new theoretical results which force us towards exciting new conclusions about the origin of these stars.

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本通知也可以在云台学术报告网页看到： 

http://www.ynao.cas.cn/xwzx/xstg/ 

申请安排学术报告的同事请参见台学术报告管理办法： 

http://www.ynao.cas.cn/xwzx/xstg/gzzd/ 

云台邀请团组：

大样本恒星演化研究组  

邀请方联系人：韩占文 0871-63920139

11月16日