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4月18日: Open clusters and the radial abundance gradient of Galactic disc
2008年04月18日

题 目:Open clusters and the radial abundance gradient of Galactic disc

报告人:中国科学院上海天文台陈力 研究员

摘 要: Open clusters (OCs) have long been used to trace the structure and evolution of the Galactic disk. Based on a most complete open clusters sample with metallicity, age, distance data as well as kinematic information available, some statistical analysis on spatial and metallicity distributions have been made. Especially, an radial abundance gradient about - 0.058 dex/kpc has been derived and by dividing clusters into age groups, we show that the disk abundance gradient was steeper in the past. This may constrain the disk chemical evolution model as that in the early stage of disk formation it had a steeper abundance gradient, while later on this gradient became flatten out. For the overall gradient along the disk, from our data, a continuous linear gradient is more favorable. And based on the great advantages of LAMOST facility, we have proposed a detailed program of open cluster survey with LAMOST (the LOCS). The aim, feasibility, and the present development of the LOCS are also briefly summarized.

时 间:2008年4月18日上午10:30

地 点:(北京西路2号)紫台大楼四楼会议室

紫金山天文台学术委员会学术交流工作委员会

2008年4月7日

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