AGES OF 70 DWARFS OF THREE POPULATIONS IN THE SOLAR NEIGHBORHOOD: CONSIDERING O AND C ABUNDANCES IN STELLAR MODELS

	AGES OF 70 DWARFS OF THREE POPULATIONS IN THE SOLAR NEIGHBORHOOD: CONSIDERING O AND C ABUNDANCES IN STELLAR MODELS
	Ge, Z. S.1; Bi, S. L.1; Chen, Y. Q.2 ; Li, T. D.3,4,5 ; Zhao, J. K.2 ; Liu, K.1; Fergusion, J. W.6; Wu, Y. Q.1
刊名	ASTROPHYSICAL JOURNAL
	2016-12-20
卷号	833 期号:2
关键词	Galaxy: disk Galaxy: formation Galaxy: halo stars: abundances stars: fundamental parameters
英文摘要	Oxygen and carbon are important elements in stellar populations. Their behavior refers to the formation history of the stellar populations. C and O abundances would also obviously influence stellar opacities and the overall metal abundance Z. With observed high-quality spectroscopic properties, we construct stellar models with C and O elements to give more accurate ages for 70 metal-poor dwarfs, which have been determined to be high-a halo, low-alpha halo, and thick-disk stars. Our results show that high-alpha halo stars are somewhat older than low-alpha halo stars by around 2.0 Gyr. The thick-disk population has an age range in between the two halo populations. The age distribution profiles indicate that high-alpha halo and low-alpha halo stars match the in situ accretion simulation by Zolotov et al., and the thick-disk stars might be formed in a relatively quiescent and long-lasting process. We also note that stellar ages are very sensitive to O abundance, since the ages clearly increase with increasing [O/Fe] values. Additionally, we obtain several stars with peculiar ages, including 2 young thick-disk stars and 12 stars older than the universe age.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	DISTINCT HALO POPULATIONS ; GALACTIC CHEMICAL EVOLUTION ; PROBE WMAP OBSERVATIONS ; GLOBULAR-CLUSTERS ; Y-2 ISOCHRONES ; MILKY-WAY ; F-DWARF ; OXYGEN ABUNDANCES ; DUAL ORIGIN ; THICK DISK
收录类别	SCI
语种	英语
WOS记录号	WOS:000391169600036
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/6812]
专题	国家天文台_光学天文研究部
作者单位	1.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China 3.Univ Sydney, Sch Phys, Sydney Inst Astron SIfA, Sydney, NSW 2006, Australia 4.Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Ny Munkegade 120, DK-8000 Aarhus C, Denmark 5.Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China 6.Wichita State Univ, Dept Phys, Wichita, KS 67260 USA
推荐引用方式 GB/T 7714	Ge, Z. S.,Bi, S. L.,Chen, Y. Q.,et al. AGES OF 70 DWARFS OF THREE POPULATIONS IN THE SOLAR NEIGHBORHOOD: CONSIDERING O AND C ABUNDANCES IN STELLAR MODELS[J]. ASTROPHYSICAL JOURNAL,2016,833(2).
APA	Ge, Z. S..,Bi, S. L..,Chen, Y. Q..,Li, T. D..,Zhao, J. K..,...&Wu, Y. Q..(2016).AGES OF 70 DWARFS OF THREE POPULATIONS IN THE SOLAR NEIGHBORHOOD: CONSIDERING O AND C ABUNDANCES IN STELLAR MODELS.ASTROPHYSICAL JOURNAL,833(2).
MLA	Ge, Z. S.,et al."AGES OF 70 DWARFS OF THREE POPULATIONS IN THE SOLAR NEIGHBORHOOD: CONSIDERING O AND C ABUNDANCES IN STELLAR MODELS".ASTROPHYSICAL JOURNAL 833.2(2016).