报告题目：Wide Binaries in Gaia DR2
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.