The stellar content of the Hamburg/ESO survey: VI. Metallicity distribution of main-sequence turnoff stars in the Galactic halo

dc.contributor.authorLi, H N
dc.contributor.authorChristlieb, N
dc.contributor.authorSchorck, T
dc.contributor.authorNorris, John
dc.contributor.authorBessell, Michael
dc.contributor.authorYong, David
dc.contributor.authorBeers, Timothy C
dc.contributor.authorLee, Young Sun
dc.contributor.authorFrebel, Anna
dc.contributor.authorZhao, G
dc.date.accessioned2015-12-08T22:36:09Z
dc.date.issued2010
dc.date.updated2016-02-24T09:53:40Z
dc.description.abstractWe 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∼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] ∼ -2.0, (the region we scientifically focus on most) both MDFs show a sharp drop at [Fe/H] ∼ -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] ∼ -3.0, and with Zcr = 10-3.4 Z⊙, is able to predict the sharp drop at [Fe/H]∼-3.6.
dc.identifier.issn0004-6361
dc.identifier.urihttp://hdl.handle.net/1885/35132
dc.publisherSpringer
dc.sourceAstronomy and Astrophysics
dc.subjectKeywords: Galactic chemical evolutions; Galactic halo; Galaxy: halo; Mass-loss; Metallicities; stars: abundances; stars: Population II; stars: statistics; Stellar content; Theoretical models; Theoretical prediction; Astrophysics; Distribution functions; Drops; Gala Galaxy: halo; stars: abundances; stars: Population II; stars: statistics; surveys
dc.titleThe stellar content of the Hamburg/ESO survey: VI. Metallicity distribution of main-sequence turnoff stars in the Galactic halo
dc.typeJournal article
local.bibliographicCitation.startpageA10
local.contributor.affiliationLi, H N, Chinese Academy of Sciences
local.contributor.affiliationChristlieb, N, University of Heidelberg
local.contributor.affiliationSchorck, T, University of Heidelberg
local.contributor.affiliationNorris, John, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationBessell, Michael, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationYong, David, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationBeers, Timothy C, Michigan State University
local.contributor.affiliationLee, Young Sun, Michigan State University
local.contributor.affiliationFrebel, Anna, Harvard University
local.contributor.affiliationZhao, G, Chinese Academy of Sciences
local.contributor.authoremailu7401084@anu.edu.au
local.contributor.authoruidNorris, John, u7401084
local.contributor.authoruidBessell, Michael, u6900904
local.contributor.authoruidYong, David, u3207952
local.description.embargo2037-12-31
local.description.notesImported from ARIES
local.identifier.absfor020110 - Stellar Astronomy and Planetary Systems
local.identifier.ariespublicationu3356449xPUB121
local.identifier.citationvolume521
local.identifier.doi10.1051/0004-6361/201014797
local.identifier.scopusID2-s2.0-77958019929
local.identifier.thomsonID000284150900071
local.identifier.uidSubmittedByu3356449
local.type.statusPublished Version

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