Title: 认定球状星团中的奇异双星

Speaker: Yue Zhao

Institute: University of Southampton

Host: Siyi Feng

Time: 14:30-16:30, Thursday, May, 18

Location: Physics Building 552

Abstract: 球状星团是由数以十万至百万计的恒星在引力相互作用下组成的古老恒星群体。其核心极高的恒星数密度可以促成天体间非常频繁的动力学相互作用。又因为球状星团中存在数量可观的致密天体（白矮星、中子星和黑洞），伴有这些致密天体参与的动力学过程会相对容易地形成不同类的密近双星（也称为“奇异双星”）。随着对这些奇异双星的了解的加深，我们可以通过X-射线、紫外、可见光、红外和射电观测来认定和区分不同种类的奇异双星。在这个报告中，我将介绍一些我们近几年来对多个球状星团中的奇异双星的认定。其中对一些星团，我们首次引入了射电巡天的图像数据，进一步地认定了一些脉冲星和恒星质量黑洞的候选。另外，利用射电巡天数据，我们找到了球状星团中射电点源数量和球状星团质量和动力学相互作用率的相关关系，说明这些射电源至少有一部分来自于通过动力学过程形成的奇异双星。

Related papers:

https://ui.adsabs.harvard.edu/abs/2019MNRAS.483.4560Z/abstract

https://ui.adsabs.harvard.edu/abs/2020MNRAS.499.3338Z/abstract

https://ui.adsabs.harvard.edu/abs/2020MNRAS.493.6033Z/abstract

https://ui.adsabs.harvard.edu/abs/2021ApJ...914...77Z/abstract

Bio: Dr. Yue Zhao received his bachelor’s degree in physics from Lanzhou University in 2014 and obtained his PhD in astrophysics from the University of Alberta in 2021. He is currently a research fellow at the University of Southampton, working with Dr. Poshak Gandhi. His research interests include observational studies of supernova natal kicks, multiwavelength observations of exotic binaries in globular clusters, and searches for compact objects in binaries from large surveys.