Galactic Chemical Evolution Through High Resolution Spectroscopy

银河系中元素的产生和分布可以通过附近恒星的高分辨率光谱来最直接地研究。古老的盘状巨星和星族II巨星、金属贫乏的场星和球状星团巨星的元素丰度将被确定。选定恒星的光谱将被用来确定银河系晕中星际云中钙和钠的丰度。虽然在变红的恒星中已经观察到弥漫性星际带很长时间了，但仍未确定其成因。一种涉及轻微变红的恒星的新策略将被用于识别它们。＊＊＊

9315068 Sneden The production and distribution of elements in the Galaxy can be most directly studied through high resolution spectroscopy of nearby stars. The elemental abundances in old disk and population II giants, in metal-poor field stars and in globular cluster giants will be determined. Spectra of selected stars will be used to determine the abundances of calcium and sodium in interstellar clouds in the galactic halo. Although diffuse interstellar bands have been observed in reddened stars for a long time, the agent responsible is still not identified. A new strategy involving lightly reddened stars will be pursued to identify them. ***