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The stellar content of the Hamburg/ESO survey VI. Metallicity distribution of main-sequence turnoff stars in the Galactic halo
Li, H. N.1,2,3; Christlieb, N.2; Schoerck, T.2; Norris, J. E.4; Bessell, M. S.4; Yong, D.4; Beers, T. C.5,6; Lee, Y. S.5,6; Frebel, A.7; Zhao, G.1
2010-10-01
发表期刊ASTRONOMY & ASTROPHYSICS
卷号521
摘要We determine the metallicity distribution function (MDF) of the Galactic halo based on metal-poor main-sequence turnoff-stars (MSTO) which were selected from the Hamburg/ESO objective-prism survey (HES) database. Corresponding follow-up moderate-resolution observations (R similar to 2000) of 682 stars (among which 617 were accepted program stars) were carried out with the 2.3 m telescope at the Siding Spring Observatory (SSO). Corrections for the survey volume covered by the sample stars were quantitatively estimated and applied to the observed MDF. The corrections are quite small, when compared with those for a previously studied sample of metal-poor giants. The corrected observational MDF of the turnoff sample was then compared with that of the giants, as well as with a number of theoretical predictions of Galactic chemical evolution, including the mass-loss modified simple model. Although the survey-volume corrected MDFs of the metal-poor turnoff and the halo giants notably differ in the region of [Fe/H] > -2.0, below [Fe/H] similar to -2.0, (the region we scientifically focus on most) both MDFs show a sharp drop at [Fe/H] similar to -3.6 and present rather similar distributions in the low-metallicity tail. Theoretical models can fit some parts of the observed MDF, but none is found to simultaneously reproduce the peak as well as the features in the metal-poor region with [Fe/H] between -2.0 to -3.6. Among the tested models only the GAMETE model, when normalized to the tail of the observed MDF below [Fe/H] similar to -3.0, and with Z(cr) = 10(-3.4) Z(circle dot), is able to predict the sharp drop at [Fe/H] similar to -3.6.
关键词Galaxy: Halo Surveys Stars: Population Ii Stars: Statistics Stars: Abundances
DOI10.1051/0004-6361/201014797
收录类别SCI
语种英语
WOS记录号WOS:000284150900071
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被引频次:23[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/7732
专题光学天文研究部
作者单位1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
2.Univ Heidelberg, Zentrum Astron, D-69117 Heidelberg, Germany
3.Chinese Acad Sci, Grad Univ, Beijing 100080, Peoples R China
4.Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
5.Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA
6.Michigan State Univ, JINA, E Lansing, MI 48824 USA
7.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
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Li, H. N.,Christlieb, N.,Schoerck, T.,et al. The stellar content of the Hamburg/ESO survey VI. Metallicity distribution of main-sequence turnoff stars in the Galactic halo[J]. ASTRONOMY & ASTROPHYSICS,2010,521.
APA Li, H. N..,Christlieb, N..,Schoerck, T..,Norris, J. E..,Bessell, M. S..,...&Zhao, G..(2010).The stellar content of the Hamburg/ESO survey VI. Metallicity distribution of main-sequence turnoff stars in the Galactic halo.ASTRONOMY & ASTROPHYSICS,521.
MLA Li, H. N.,et al."The stellar content of the Hamburg/ESO survey VI. Metallicity distribution of main-sequence turnoff stars in the Galactic halo".ASTRONOMY & ASTROPHYSICS 521(2010).
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