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High-resolution spectroscopic observations of Hipparcos red clump giants: Metallicity and mass determinations
Zhao, G; Qiu, HM; Mao, S
2001-04-18
发表期刊ASTROPHYSICAL JOURNAL
卷号551期号:1页码:L85-L88
摘要We obtain high-resolution and high signal-to-noise ratio spectra of 39 red clump giants selected from the Hipparcos Catalogue. We determine their atmospheric parameters, iron abundances, alpha -element enhancements, and masses. We find that the sample can be divided into a metal-poor group and a metal-rich group. The majority of the stars are metal-rich (Z>0.3 Z(.)) with mass around 2 M-., while the metal-poor group has lower surface gravity and lower mass. The variation of alpha -element abundances with [Fe/H] agrees with that of local G and K disk dwarfs. We also show that the metallicity is weakly correlated with the I-band absolute magnitude and the V-I color, in agreement with Udalski's recent findings. We make the high-resolution spectra available over the internet for interested readers.
关键词Stars : Abundances Stars : Distances Stars : Late-type
收录类别SCI
语种英语
WOS记录号WOS:000168153300020
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文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8581
专题光学天文研究部
作者单位1.Chinese Acad Sci, Beijing Astron Observ, Beijing 100012, Peoples R China
2.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China
3.Univ Manchester, Jodrell Bank Observ, Macclesfield SK11 9DL, Cheshire, England
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Zhao, G,Qiu, HM,Mao, S. High-resolution spectroscopic observations of Hipparcos red clump giants: Metallicity and mass determinations[J]. ASTROPHYSICAL JOURNAL,2001,551(1):L85-L88.
APA Zhao, G,Qiu, HM,&Mao, S.(2001).High-resolution spectroscopic observations of Hipparcos red clump giants: Metallicity and mass determinations.ASTROPHYSICAL JOURNAL,551(1),L85-L88.
MLA Zhao, G,et al."High-resolution spectroscopic observations of Hipparcos red clump giants: Metallicity and mass determinations".ASTROPHYSICAL JOURNAL 551.1(2001):L85-L88.
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