Light-ish Elements in Dwarf Galaxies: The Enigmas of Lithium, Carbon, Magnesium, and More
报告人: Prof. Evan Kirby (Caltech)
报告时间: 2016年4月07日 14:00
报告地点: South 727, Mong Man-wei Science Technology Building (蒙民伟科技南楼S727)
Abstract: Dwarf galaxies in the Local Group are good testing grounds for chemical evolution models. First, they are simple, usually short-lived systems. Second, they are near enough for resolved stellar spectroscopy. Multi-object spectrographs, like Keck/DEIMOS, have allowed the chemical characterization of thousands of stars in dwarf galaxies. The lighter elements like lithium and carbon, are windows into stellar evolution. The heavier alpha elements, like magnesium and calcium, trace galactic evolution. I will show DEIMOS measurements of several elements in eight dwarf galaxies. The results will illuminate some mysteries about unexplained mixing processes on the red giant branch as well as the broader chemical evolution of the galaxies over hundreds of millions of years.