报告题目：Wide Binaries in Gaia DR2

报告人：田海俊 副教授（三峡大学理学院）

报告时间：2019年9月27 日（周五）下午3:00

报告地点：物理学院新楼4楼阳光房

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 the precise positions, proper motions, parallaxes and colors in Gaia DR2. These parameters are 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 Varies 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.

报告人简介：

田海俊，副教授，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、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（省杰青年基金），其他课题五项，发表学术论文20余篇，文章被引120余次。现任三峡大学理学院副院长、天文与空间科学研究中心执行主任，湖北省天文学会理事。

邀请人：范锡龙 研究员