RED CLUMP STARS IN THE SAGITTARIUS TIDAL STREAMS

	RED CLUMP STARS IN THE SAGITTARIUS TIDAL STREAMS
	Carrell, Kenneth 1,2; Wilhelm, Ronald 3; Chen, YuQin1
刊名	ASTRONOMICAL JOURNAL
	2012-07-01
卷号	144 期号:1
关键词	galaxies: interactions Galaxy: halo stars: horizontal-branch
英文摘要	We have probed a section (l similar to 150, b similar to -60) of the trailing tidal arm of the Sagittarius dwarf spheroidal galaxy by identifying a sample of Red Clump (RC) stream stars. RC stars are not generally found in the halo field, but are found in significant numbers in both the Sagittarius galaxy and its tidal streams, making them excellent probes of stream characteristics. Our target sample was selected using photometric data from the Sloan Digital Sky Survey, Data Release 6, which was constrained in color to match the Sagittarius RC stars. Spectroscopic observations of the target stars were conducted at Kitt Peak National Observatory using the WIYN telescope. The resulting spectroscopic sample is magnitude limited and contains both main-sequence disk stars and evolved RC stars. We have developed a method to systematically separate these two stellar classes using kinematic information and a Bayesian approach for surface gravity determination. The resulting RC sample allows us to determine an absolute stellar density of rho = 2.7 +/- 0.5 RC stars kpc(-3) at this location in the stream. Future measurements of stellar densities for a variety of populations and at various locations along the streams will lead to a much improved understanding of the original nature of the Sagittarius galaxy and the physical processes controlling its disruption and subsequent stream generation.
收录类别	SCI
语种	英语
WOS记录号	WOS:000305418600018
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/6225]
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.Texas Tech Univ, Dept Phys, Lubbock, TX 79409 USA 3.Univ Kentucky, Dept Phys & Astron, Lexington, KY 40506 USA
推荐引用方式 GB/T 7714	Carrell, Kenneth,Wilhelm, Ronald,Chen, YuQin. RED CLUMP STARS IN THE SAGITTARIUS TIDAL STREAMS[J]. ASTRONOMICAL JOURNAL,2012,144(1).
APA	Carrell, Kenneth,Wilhelm, Ronald,&Chen, YuQin.(2012).RED CLUMP STARS IN THE SAGITTARIUS TIDAL STREAMS.ASTRONOMICAL JOURNAL,144(1).
MLA	Carrell, Kenneth,et al."RED CLUMP STARS IN THE SAGITTARIUS TIDAL STREAMS".ASTRONOMICAL JOURNAL 144.1(2012).