Red clump stars from the LAMOST data I: identification and distance

	Red clump stars from the LAMOST data I: identification and distance
	Wan, Jun-Chen1 ; Liu, Chao1 ; Deng, Li-Cai1 ; Cui, Wen-Yuan 2; Zhang, Yong 3; Hou, Yong-Hui 3; Yang, Ming1 ; Wu, Yue1
刊名	RESEARCH IN ASTRONOMY AND ASTROPHYSICS
	2015-08-01
卷号	15 期号:8 页码:1166-1181
关键词	stars: general stars: horizontal-branch stars: statistics stars: distances Galaxy: stellar content
英文摘要	We present a sample of about 120 000 red clump candidates selected from the LAMOST DR2 catalog based on the empirical distribution model in the effective temperature vs. surface gravity plane. Although, in general, red clump stars are considered as standard candles, they do not exactly stay in a narrow range of absolute magnitude, but may have a range of more than one magnitude depending on their initial mass. Consequently, conventional oversimplified distance estimations with the assumption of a fixed luminosity may lead to systematic bias related to the initial mass or age, which can potentially affect the study of the evolution of the Galaxy with red clump stars. We therefore employ an isochrone-based method to estimate the absolute magnitude of red clump stars from their observed surface gravities, effective temperatures and metallicities. We verify that the estimation removes the systematics well and provides initial mass/age estimates that are independent of distance with accuracy better than 10%.
收录类别	SCI
语种	英语
WOS记录号	WOS:000360553400006
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/5619]
专题	国家天文台_光学天文研究部
作者单位	1.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China 2.Hebei Normal Univ, Dept Phys, Shijiazhuang 050024, Peoples R China 3.Chinese Acad Sci, Nanjing Inst Astron Opt & Technol, Natl Astron Observ, Nanjing 210042, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Wan, Jun-Chen,Liu, Chao,Deng, Li-Cai,et al. Red clump stars from the LAMOST data I: identification and distance[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2015,15(8):1166-1181.
APA	Wan, Jun-Chen.,Liu, Chao.,Deng, Li-Cai.,Cui, Wen-Yuan.,Zhang, Yong.,...&Wu, Yue.(2015).Red clump stars from the LAMOST data I: identification and distance.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,15(8),1166-1181.
MLA	Wan, Jun-Chen,et al."Red clump stars from the LAMOST data I: identification and distance".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 15.8(2015):1166-1181.