Origins of the thick disk as traced by the alpha elements of metal-poor giant stars selected from RAVE
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Ruchti, Gregory R; Fulbright, J.P.; Wyse, Rosemary F G; Gilmore, Gerard; Bienayme, O; Binney, J; Bland-Hawthorn, Joss; Campbell, R; Freeman, Kenneth; Gibson, Bradley K; Grebel, E.; Helmi, Amina; Munari, U; Navarro, J F; Parker, Quentin A; Reid, W; Steinmetz, Matthias; Watson, Fred G
Description
Theories of thick-disk formation can be differentiated by measurements of stellar elemental abundances. We have undertaken a study of metal-poor stars selected from the RAVE spectroscopic survey of bright stars to establish whether or not there is a significant population of metal-poor thick-disk stars ([Fe/H] ≲ -1.0) and to measure their elemental abundances. In this Letter, we present abundances of four α-elements (Mg, Si, Ca, and Ti) and iron for a subsample of 212 red giant branch and 31...[Show more]
dc.contributor.author | Ruchti, Gregory R | |
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dc.contributor.author | Fulbright, J.P. | |
dc.contributor.author | Wyse, Rosemary F G | |
dc.contributor.author | Gilmore, Gerard | |
dc.contributor.author | Bienayme, O | |
dc.contributor.author | Binney, J | |
dc.contributor.author | Bland-Hawthorn, Joss | |
dc.contributor.author | Campbell, R | |
dc.contributor.author | Freeman, Kenneth | |
dc.contributor.author | Gibson, Bradley K | |
dc.contributor.author | Grebel, E. | |
dc.contributor.author | Helmi, Amina | |
dc.contributor.author | Munari, U | |
dc.contributor.author | Navarro, J F | |
dc.contributor.author | Parker, Quentin A | |
dc.contributor.author | Reid, W | |
dc.contributor.author | Steinmetz, Matthias | |
dc.contributor.author | Watson, Fred G | |
dc.date.accessioned | 2015-12-10T22:38:47Z | |
dc.identifier.issn | 0004-637X | |
dc.identifier.uri | http://hdl.handle.net/1885/56882 | |
dc.description.abstract | Theories of thick-disk formation can be differentiated by measurements of stellar elemental abundances. We have undertaken a study of metal-poor stars selected from the RAVE spectroscopic survey of bright stars to establish whether or not there is a significant population of metal-poor thick-disk stars ([Fe/H] ≲ -1.0) and to measure their elemental abundances. In this Letter, we present abundances of four α-elements (Mg, Si, Ca, and Ti) and iron for a subsample of 212 red giant branch and 31 red clump/horizontal branch stars from this study. We find that the [α/Fe] ratios are enhanced, implying that enrichment proceeded by purely core-collapse supernovae. This requires that star formation in each star-forming region had a short duration. The relative lack of scatter in the [α/Fe] ratios implies good mixing in the interstellar medium prior to star formation. In addition, the ratios resemble that of the halo, indicating that the halo and thick disk share a similar massive star initial mass function. We conclude that the α-enhancement of the metal-poor thick disk implies that direct accretion of stars from dwarf galaxies similar to surviving dwarf galaxies today did not play a major role in the formation of the thick disk. | |
dc.publisher | IOP Publishing | |
dc.source | Astrophysical Journal, The | |
dc.subject | Keywords: Galaxy: abundances; Galaxy: disk; Stars: abundances; Stars: late-type | |
dc.title | Origins of the thick disk as traced by the alpha elements of metal-poor giant stars selected from RAVE | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.identifier.citationvolume | 721 | |
dc.date.issued | 2010 | |
local.identifier.absfor | 020104 - Galactic Astronomy | |
local.identifier.ariespublication | f2965xPUB379 | |
local.type.status | Published Version | |
local.contributor.affiliation | Ruchti, Gregory R, Johns Hopkins University | |
local.contributor.affiliation | Fulbright, J.P., Johns Hopkins University | |
local.contributor.affiliation | Wyse, Rosemary F G, Johns Hopkins University | |
local.contributor.affiliation | Gilmore, Gerard, University of Cambridge | |
local.contributor.affiliation | Bienayme, O, Observatoire de Strasbourg | |
local.contributor.affiliation | Binney, J, University of Oxford | |
local.contributor.affiliation | Bland-Hawthorn, Joss, University of Sydney | |
local.contributor.affiliation | Campbell, R, Western Kentucky University | |
local.contributor.affiliation | Freeman, Kenneth, College of Physical and Mathematical Sciences, ANU | |
local.contributor.affiliation | Gibson, Bradley K, University of Central Lancashire | |
local.contributor.affiliation | Grebel, E., Universitat Heidelberg | |
local.contributor.affiliation | Helmi, Amina, University of Groningen | |
local.contributor.affiliation | Munari, U, INAF-Osservatorio Astronomico di Padova | |
local.contributor.affiliation | Navarro, J F, University of Victoria | |
local.contributor.affiliation | Parker, Quentin A, Macquarie University | |
local.contributor.affiliation | Reid, W, Macquarie University | |
local.contributor.affiliation | Steinmetz, Matthias, Astrophysical Institute Potsdam | |
local.contributor.affiliation | Watson, Fred G, Anglo-Australian Observatory | |
local.description.embargo | 2037-12-31 | |
local.bibliographicCitation.issue | 2 PART 2 | |
local.bibliographicCitation.startpage | L92 | |
local.bibliographicCitation.lastpage | L96 | |
local.identifier.doi | 10.1088/2041-8205/721/2/L92 | |
dc.date.updated | 2016-02-24T08:28:04Z | |
local.identifier.scopusID | 2-s2.0-78649264102 | |
local.identifier.thomsonID | 000282192200004 | |
Collections | ANU Research Publications |
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