AustralieFrV1, Main, Exploration, bibRecord, 007675

ORIGINS OF THE THICK DISK AS TRACED BY THE ALPHA ELEMENTS OF METAL-POOR GIANT STARS SELECTED FROM RAVE

Identifieur interne : 007675 ( Main/Exploration ); précédent : 007674; suivant : 007676

ORIGINS OF THE THICK DISK AS TRACED BY THE ALPHA ELEMENTS OF METAL-POOR GIANT STARS SELECTED FROM RAVE

Auteurs : G. R. Ruchti [États-Unis] ; J. P. Fulbright [États-Unis] ; R. F. G. Wyse [États-Unis] ; G. F. Gilmore [Royaume-Uni] ; O. Bienayme [France] ; J. Binney [Royaume-Uni] ; J. Bland-Hawthorn [Australie] ; R. Campbell [États-Unis] ; K. C. Freeman [Australie] ; B. K. Gibson [Royaume-Uni] ; E. K. Grebel [Allemagne] ; A. Helmi [Pays-Bas] ; U. Munari [Italie] ; J. F. Navarro [Canada] ; Q. A. Parker [Australie] ; W. Reid [Australie] ; G. M. Seabroke [Royaume-Uni] ; A. Siebert [France] ; A. Siviero [Canada, Allemagne] ; M. Steinmetz [Allemagne] ; F. G. Watson [Australie] ; M. Williams [Slovénie] ; T. Zwitter [Slovénie]

Source :

The Astrophysical journal [ 0004-637X ] ; 2010.

RBID : Pascal:10-0473892

Descripteurs français

Pascal (Inist)
- Etoile pauvre en métal, Abondance stellaire, Abondance élément, Etoile brillante, Géante rouge, Etoile branche horizontale, Effondrement, Supernova, Formation stellaire, Région formation stellaire, Mélangeage, Matière interstellaire, Etoile massive, Masse stellaire, Fonction masse initiale, Accrétion stellaire, Etoile naine, Galaxies naines, Galaxies disques, Etoile type avancé.

English descriptors

KwdEn :
- Bright star, Collapse, Disk galaxies, Dwarf galaxies, Dwarf stars, Element abundance, Horizontal-branch stars, Initial mass function, Interstellar matter, Late type stars, Massive stars, Metal-poor stars, Mixing, Red giant stars, Star accretion, Star formation, Stellar abundance, Stellar formation region, Stellar mass, Supernovae.

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.

Affiliations:

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Le document en format XML

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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">ORIGINS OF THE THICK DISK AS TRACED BY THE ALPHA ELEMENTS OF METAL-POOR GIANT STARS SELECTED FROM RAVE</title>
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<author><name sortKey="Reid, W" sort="Reid, W" uniqKey="Reid W" first="W." last="Reid">W. Reid</name>
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<author><name sortKey="Siviero, A" sort="Siviero, A" uniqKey="Siviero A" first="A." last="Siviero">A. Siviero</name>
<affiliation wicri:level="1"><inist:fA14 i1="12"><s1>University of Victoria, P.O. Box 3055, Station CSC</s1>
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<country>Canada</country>
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<author><name sortKey="Watson, F G" sort="Watson, F G" uniqKey="Watson F" first="F. G." last="Watson">F. G. Watson</name>
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<series><title level="j" type="main">The Astrophysical journal</title>
<title level="j" type="abbreviated">Astrophys. j.</title>
<idno type="ISSN">0004-637X</idno>
<imprint><date when="2010">2010</date>
</imprint>
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</biblStruct>
</sourceDesc>
<seriesStmt><title level="j" type="main">The Astrophysical journal</title>
<title level="j" type="abbreviated">Astrophys. j.</title>
<idno type="ISSN">0004-637X</idno>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Bright star</term>
<term>Collapse</term>
<term>Disk galaxies</term>
<term>Dwarf galaxies</term>
<term>Dwarf stars</term>
<term>Element abundance</term>
<term>Horizontal-branch stars</term>
<term>Initial mass function</term>
<term>Interstellar matter</term>
<term>Late type stars</term>
<term>Massive stars</term>
<term>Metal-poor stars</term>
<term>Mixing</term>
<term>Red giant stars</term>
<term>Star accretion</term>
<term>Star formation</term>
<term>Stellar abundance</term>
<term>Stellar formation region</term>
<term>Stellar mass</term>
<term>Supernovae</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Etoile pauvre en métal</term>
<term>Abondance stellaire</term>
<term>Abondance élément</term>
<term>Etoile brillante</term>
<term>Géante rouge</term>
<term>Etoile branche horizontale</term>
<term>Effondrement</term>
<term>Supernova</term>
<term>Formation stellaire</term>
<term>Région formation stellaire</term>
<term>Mélangeage</term>
<term>Matière interstellaire</term>
<term>Etoile massive</term>
<term>Masse stellaire</term>
<term>Fonction masse initiale</term>
<term>Accrétion stellaire</term>
<term>Etoile naine</term>
<term>Galaxies naines</term>
<term>Galaxies disques</term>
<term>Etoile type avancé</term>
</keywords>
</textClass>
</profileDesc>
</teiHeader>
<front><div type="abstract" xml:lang="en">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.</div>
</front>
</TEI>
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<li>États-Unis</li>
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<li>Nouvelle-Galles du Sud</li>
<li>Oxfordshire</li>
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<settlement><li>Cambridge</li>
<li>Groningue (ville)</li>
<li>Heidelberg</li>
<li>Londres</li>
<li>Oxford</li>
<li>Strasbourg</li>
<li>Sydney</li>
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<orgName><li>University College de Londres</li>
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<tree><country name="États-Unis"><noRegion><name sortKey="Ruchti, G R" sort="Ruchti, G R" uniqKey="Ruchti G" first="G. R." last="Ruchti">G. R. Ruchti</name>
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<name sortKey="Wyse, R F G" sort="Wyse, R F G" uniqKey="Wyse R" first="R. F. G." last="Wyse">R. F. G. Wyse</name>
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<country name="Royaume-Uni"><region name="Angleterre"><name sortKey="Gilmore, G F" sort="Gilmore, G F" uniqKey="Gilmore G" first="G. F." last="Gilmore">G. F. Gilmore</name>
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</country>
<country name="France"><region name="Grand Est"><name sortKey="Bienayme, O" sort="Bienayme, O" uniqKey="Bienayme O" first="O." last="Bienayme">O. Bienayme</name>
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<name sortKey="Siebert, A" sort="Siebert, A" uniqKey="Siebert A" first="A." last="Siebert">A. Siebert</name>
</country>
<country name="Australie"><region name="Nouvelle-Galles du Sud"><name sortKey="Bland Hawthorn, J" sort="Bland Hawthorn, J" uniqKey="Bland Hawthorn J" first="J." last="Bland-Hawthorn">J. Bland-Hawthorn</name>
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<name sortKey="Freeman, K C" sort="Freeman, K C" uniqKey="Freeman K" first="K. C." last="Freeman">K. C. Freeman</name>
<name sortKey="Parker, Q A" sort="Parker, Q A" uniqKey="Parker Q" first="Q. A." last="Parker">Q. A. Parker</name>
<name sortKey="Reid, W" sort="Reid, W" uniqKey="Reid W" first="W." last="Reid">W. Reid</name>
<name sortKey="Watson, F G" sort="Watson, F G" uniqKey="Watson F" first="F. G." last="Watson">F. G. Watson</name>
</country>
<country name="Allemagne"><region name="Bade-Wurtemberg"><name sortKey="Grebel, E K" sort="Grebel, E K" uniqKey="Grebel E" first="E. K." last="Grebel">E. K. Grebel</name>
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<name sortKey="Siviero, A" sort="Siviero, A" uniqKey="Siviero A" first="A." last="Siviero">A. Siviero</name>
<name sortKey="Steinmetz, M" sort="Steinmetz, M" uniqKey="Steinmetz M" first="M." last="Steinmetz">M. Steinmetz</name>
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<country name="Pays-Bas"><region name="Groningue (province)"><name sortKey="Helmi, A" sort="Helmi, A" uniqKey="Helmi A" first="A." last="Helmi">A. Helmi</name>
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<country name="Italie"><noRegion><name sortKey="Munari, U" sort="Munari, U" uniqKey="Munari U" first="U." last="Munari">U. Munari</name>
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<name sortKey="Siviero, A" sort="Siviero, A" uniqKey="Siviero A" first="A." last="Siviero">A. Siviero</name>
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<country name="Slovénie"><noRegion><name sortKey="Williams, M" sort="Williams, M" uniqKey="Williams M" first="M." last="Williams">M. Williams</name>
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<name sortKey="Zwitter, T" sort="Zwitter, T" uniqKey="Zwitter T" first="T." last="Zwitter">T. Zwitter</name>
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	Serveur d'exploration sur les relations entre la France et l'Australie
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ORIGINS OF THE THICK DISK AS TRACED BY THE ALPHA ELEMENTS OF METAL-POOR GIANT STARS SELECTED FROM RAVE

ORIGINS OF THE THICK DISK AS TRACED BY THE ALPHA ELEMENTS OF METAL-POOR GIANT STARS SELECTED FROM RAVE

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