报告题目：Wide Binaries in Gaia DR2 

　　报告人：田海俊 教授 

　　报告人简介：湖北省天文学会理事，曾连续三年入选LAMOST Fellow，三峡大学“151”学术带头人，德国马克思普朗克天文所（MPIA）访问学者。近年研究兴趣主要包括：恒星运动学统计、自行测量、双星、银河系结构与演化等。主持国家自然基金三项，参与国家重点基金一项，主持湖北省重点基金一项（省杰出青年基金），发表学术论文30余篇，文章被引120余次。 

　　报告摘要：Gaia, a cornerstone mission of the European Space Agency (ESA), delivered its second release (Gaia DR2) on April 25 2018. More than 1.3 billion stars in the Milk Way were measured precise positions, proper motions, parallaxes and colors in Gaia DR2, which provides us vital observational pieces to choose wide binaries within a large volume.  

　　It has long been recognized that wide binaries provide a powerful tracer of the Galactic gravitational potential on small scales as well as useful constraints for studies of the star formation process. We recently compiled such a catalog including more than 800 thousands of wide binary candidates from Gaia DR2. With this sample, we carry out several scientific applications: 1) The Separation Distribution of Ultra-Wide Binaries across Galactic Populations; 2) Discovery of an equal-mass “twin” binary population reaching 1000+ AU separations; 3) Precise ages of field stars from dwarf companions.  

　　In this talk, I will overview these works in brief. 

　　报告时间：2020年1月13日（星期一）上午10:30 

　　报告地点：仙林园区3-201会议室 

欢迎大家参加！ 

紫金山天文台学术委员会