主讲人单位 (Speaker's Institute): Universidad de Concepción（康塞普西西大学，智利）

邀请人 (Invited by): 汤柏添 黄志琦

时间 (Time): 星期四，2022/06/23-9：00-10：00

地点 (Location): Zoom/珠海校区天琴中心3416会议室

摘要 (Abstract): 

A major goal of modern astronomy is to obtain an understanding of galaxy formation. Globular clusters (GCs) are among our most powerful cosmological archeology probes. Bulge GCs (BGCs), in particular, very likely include the oldest object in the Galaxy for which we can obtain an accurate age. Unfortunately, until recently we have not been able to unleash the full power of BGCs to help unravel the history of the ancient bulge. The bulge has resisted detailed investigation due to the high foreground extinction that strongly limits optical observations. However, absorption is minimized by observing in the near-IR window, which has recently been opened via appropriate instruments. We report on initial results from our efforts to provide accurate photometry (HST and Gemini-S) and spectroscopy (CAPOS, the bulge Cluster APOgee Survey) for BGCs. The combination of these datasets allows us to investigate metallicities, multiple populations, kinematics, origins and ages for a large sample of BGCs for the first time and provides an unprecedented resource for greatly improving our knowledge of the formation and evolution of BGCs, the bulge and the Galaxy.

主讲人简介 (Speaker's CV): 

Douglas Geisler obtained his PhD in Astronomy in 1983 at the University of Washington, USA, and joined Universidad de Concepción in 1999. In 2019, Dr. Geisler received the title of Professor Emeritus from the Academic Council of the University of Concepción, an honorary degree that is awarded to the outstanding academics of the house of studies. 

His research interests are mainly optical and IR observational astronomy, particularly the study of the composition, age and content of stellar populations in nearby galaxies, especially star clusters.  His work includes both Galactic and extragalactic populations.