The metallicity of the old open cluster NGC 6791

被引：83
|
作者：
Gratton, R
Bragaglia, A
Carretta, E
Tosi, M
机构：
[1] Osserv Astron Padova, INAF, I-35122 Padua, Italy
[2] Osservatorio Astron Bologna, INAF, I-40127 Bologna, Italy
来源：
ASTROPHYSICAL JOURNAL | 2006年 / 642卷 / 01期
关键词：
galaxy : disk; open clusters and associations : general; open clusters and associations : individual NGC 6791); stars : abundances;
D O I：
10.1086/500729
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We have observed four red clump stars in the very old, metal-rich open cluster NGC 6791 to derive its metallicity using the high-resolution spectrograph SARG mounted on the Galileo National Telescope (TNG). Using a spectrum synthesis technique, we obtain an average value of [Fe/H] = +0.47 (+/- 0.04, rms 0.08) dex. Our method was tested on mu Leo, a well-studied, metal-rich field giant. We also derive average oxygen and carbon abundances for NGC 6791 from synthesis of [O I] at 6300 angstrom and C-2 at 5086 angstrom, finding O/Fe similar or equal to -0.3 and [C/Fe] similar or equal to 0.2.
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收藏
页码：462 / 469
页数：8
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