Is There an AGB Star in NGC 6791?

被引：0

作者：

Hartig, E. ^{[1
]}

Lebzelter, T. ^{[1
]}

Hinkle, K. H. ^{[2
]}

机构：

[1] Univ Vienna, Dept Astron, A-1010 Vienna, Austria

[2] Natl Opt Astron Observ, Tucson, AZ 85719 USA

来源：

WHY GALAXIES CARE ABOUT AGB STARS II: SHINING EXAMPLES AND COMMON INHABITANTS | 2011年 / 445卷

基金：

奥地利科学基金会;

关键词：

OPEN CLUSTER NGC-6791; OLD;

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Unique in many ways, NGC 6791 is one of the richest and most populous open clusters in our Galaxy, and with an age of 8 - 10 Gyr it is quite possibly the oldest. One of the mysteries of the cluster is the low brightness of its RGB-tip which in combination with other features of the CMD fuels speculation on an enhanced mass loss on the RGB and an evolution avoiding a core-helium flash. We re-investigated the variable star population of the cluster's giant branch to look for AGB star candidates. Time-series images of the cluster were used to identify long-period variable stars. Reanalysis of existing photometric, spectroscopic and proper-motion data was employed to separate cluster and field stars and to characterize the cluster variables.

引用

页码：451 / +

页数：2

共 50 条

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