THE LAMOST SPECTROSCOPIC SURVEY OF STAR CLUSTERS IN M31. II. METALLICITIES, AGES, AND MASSES

	THE LAMOST SPECTROSCOPIC SURVEY OF STAR CLUSTERS IN M31. II. METALLICITIES, AGES, AND MASSES
	Chen, Bingqiu 1; Liu, Xiaowei 1,2; Xiang, Maosheng 3; Yuan, Haibo 4; Huang, Yang 1; Shi, Jianrong; Fan, Zhou; Huo, Zhiying; Wang, Chun 1; Ren, Juanjuan 1,3
刊名	ASTRONOMICAL JOURNAL
	2016-08-01
卷号	152 期号:2
关键词	galaxies: star clusters: general galaxies: star clusters: individual (M31)
英文摘要	We select from Paper. I a sample of 306 massive star clusters observed with the Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) in the vicinity fields of M31 and M33, and determine their metallicities, ages, and masses. Metallicities and ages are estimated by fitting the observed integrated spectra with stellar synthesis population (SSP) models with a pixel-to-pixel spectral fitting technique. Ages for most young clusters are also derived by fitting the multi-band photometric measurements with model spectral energy distributions (SEDs). The estimated cluster ages span a wide range, from several million years to the age of the universe. The numbers of clusters younger and older than 1 Gyr are, respectively, 46 and 260. With ages and metallicities determined, cluster masses are then estimated by comparing the multi-band photometric measurements with SSP model SEDs. The derived masses range from similar to 10(3) to similar to 10(7) M-circle dot, peaking at similar to 10(4.3) and similar to 10(5.7) M-circle dot for young (< 1 Gyr) and old (> 1 Gyr) clusters, respectively. Our estimated metallicities, ages, and masses are in good agreement with available literature values. Old clusters richer than [Fe/H] similar to -0.7 dex have a wide range of ages. Those poorer than [Fe/H] similar to -0.7 dex seem to be composed of two groups, as previously found for Galactic globular clusters-one of the oldest ages with all values of metallicity down to similar to-2 dex and another with metallicity increasing with decreasing age. The old clusters in the inner disk of M31 (0-30 kpc) show a clear metallicity gradient measured at -0.038. +/- 0.023 dex kpc(-1).
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	SPECTRAL ENERGY-DISTRIBUTIONS ; STELLAR POPULATION SYNTHESIS ; EVOLUTIONARY SYNTHESIS MODELS ; NEWTON-TELESCOPE LIBRARY ; COLOR-MAGNITUDE DIAGRAMS ; HALO GLOBULAR-CLUSTERS ; BRIGHT YOUNG CLUSTERS ; DIGITAL SKY SURVEY ; WIDE-FIELD SURVEY ; OUTER HALO
收录类别	SCI
语种	英语
WOS记录号	WOS:000381817500018
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/5274]
专题	国家天文台_光学天文研究部
作者单位	1.Peking Univ, Dept Astron, Beijing 100871, Peoples R China 2.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China 3.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 4.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China 5.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China 6.Chinese Acad Sci, Natl Astron Observ, Nanjing Inst Astron Opt & Technol, Nanjing 210042, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Chen, Bingqiu,Liu, Xiaowei,Xiang, Maosheng,et al. THE LAMOST SPECTROSCOPIC SURVEY OF STAR CLUSTERS IN M31. II. METALLICITIES, AGES, AND MASSES[J]. ASTRONOMICAL JOURNAL,2016,152(2).
APA	Chen, Bingqiu.,Liu, Xiaowei.,Xiang, Maosheng.,Yuan, Haibo.,Huang, Yang.,...&Wang, Yuefei.(2016).THE LAMOST SPECTROSCOPIC SURVEY OF STAR CLUSTERS IN M31. II. METALLICITIES, AGES, AND MASSES.ASTRONOMICAL JOURNAL,152(2).
MLA	Chen, Bingqiu,et al."THE LAMOST SPECTROSCOPIC SURVEY OF STAR CLUSTERS IN M31. II. METALLICITIES, AGES, AND MASSES".ASTRONOMICAL JOURNAL 152.2(2016).