Time：3:00pm May 12th (Thursday)

Tecent Meeting ID：352-311-503，password：6360

Speaker：Prof. Chengyuan Li（Sun Yat-sen University）

Title：The multiple stellar populations problem and the role of the Chinese Space Station Telescope

Abstract：The detection of star-to-star chemical variations found in almost all globular clusters, has strongly challenged the consensus of the star and star cluster formation scenario, which implicates that star clusters are "simple"-stellar populations. This so-called "multiple stellar populations" problem, has significant impacts on various astrophysical aspects, including star formation, stellar nucleosynthesis, as well as galaxy formation and evolution. In this talk, I will first review the progress of this active field -- multiple stellar populations in star clusters. In particular, I will introduce the significant role of the Hubble Space Telescope (HST) in the field. The Chinese Space Station Telescope (CSST), has many parameters similar to the Hubble Space Telescope, with a significantly larger field of view. It is therefore a suitable instrument for studying multiple stellar populations in star clusters, as well. I will introduce our analyses of the CSST's capacity of searching for multiple stellar populations, based on the multi-channel imager. We find that CSST has comparable efficiency for disentangling multiple stellar populations through photometry to the HST. We conclude that CSST can take over the role of the HST in the study of multiple stellar populations in the next decade.

报告视频（蔻享链接）