ORIGINS OF THE THICK DISK AS TRACED BY THE ALPHA ELEMENTS OF METAL-POOR GIANT STARS SELECTED FROM RAVE
Identifieur interne : 002193 ( PascalFrancis/Checkpoint ); précédent : 002192; suivant : 002194ORIGINS 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.
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:
- Allemagne, Australie, Canada, France, Italie, Pays-Bas, Royaume-Uni, Slovénie, États-Unis
- Alsace (région administrative), Angleterre, Angleterre de l'Est, Bade-Wurtemberg, District de Karlsruhe, Grand Est, Grand Londres, Groningue (province), Nouvelle-Galles du Sud, Oxfordshire
- Cambridge, Groningue (ville), Heidelberg, Londres, Oxford, Strasbourg, Sydney
- University College de Londres, Université d'Oxford, Université de Cambridge, Université de Groningue, Université de Sydney
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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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<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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<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>
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<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>
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<fA08 i1="01" i2="1" l="ENG"><s1>ORIGINS OF THE THICK DISK AS TRACED BY THE ALPHA ELEMENTS OF METAL-POOR GIANT STARS SELECTED FROM RAVE</s1>
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<fA11 i1="01" i2="1"><s1>RUCHTI (G. R.)</s1>
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<fA61><s0>A</s0>
</fA61>
<fA64 i1="01" i2="1"><s0>The Astrophysical journal</s0>
</fA64>
<fA66 i1="01"><s0>GBR</s0>
</fA66>
<fC01 i1="01" l="ENG"><s0>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.</s0>
</fC01>
<fC02 i1="01" i2="3"><s0>001E03</s0>
</fC02>
<fC03 i1="01" i2="3" l="FRE"><s0>Etoile pauvre en métal</s0>
<s5>26</s5>
</fC03>
<fC03 i1="01" i2="3" l="ENG"><s0>Metal-poor stars</s0>
<s5>26</s5>
</fC03>
<fC03 i1="02" i2="X" l="FRE"><s0>Abondance stellaire</s0>
<s5>27</s5>
</fC03>
<fC03 i1="02" i2="X" l="ENG"><s0>Stellar abundance</s0>
<s5>27</s5>
</fC03>
<fC03 i1="02" i2="X" l="SPA"><s0>Abundancia estelar</s0>
<s5>27</s5>
</fC03>
<fC03 i1="03" i2="3" l="FRE"><s0>Abondance élément</s0>
<s5>28</s5>
</fC03>
<fC03 i1="03" i2="3" l="ENG"><s0>Element abundance</s0>
<s5>28</s5>
</fC03>
<fC03 i1="04" i2="X" l="FRE"><s0>Etoile brillante</s0>
<s5>29</s5>
</fC03>
<fC03 i1="04" i2="X" l="ENG"><s0>Bright star</s0>
<s5>29</s5>
</fC03>
<fC03 i1="04" i2="X" l="SPA"><s0>Estrella brillante</s0>
<s5>29</s5>
</fC03>
<fC03 i1="05" i2="3" l="FRE"><s0>Géante rouge</s0>
<s5>30</s5>
</fC03>
<fC03 i1="05" i2="3" l="ENG"><s0>Red giant stars</s0>
<s5>30</s5>
</fC03>
<fC03 i1="06" i2="3" l="FRE"><s0>Etoile branche horizontale</s0>
<s5>31</s5>
</fC03>
<fC03 i1="06" i2="3" l="ENG"><s0>Horizontal-branch stars</s0>
<s5>31</s5>
</fC03>
<fC03 i1="07" i2="X" l="FRE"><s0>Effondrement</s0>
<s5>32</s5>
</fC03>
<fC03 i1="07" i2="X" l="ENG"><s0>Collapse</s0>
<s5>32</s5>
</fC03>
<fC03 i1="07" i2="X" l="SPA"><s0>Desmoronamiento</s0>
<s5>32</s5>
</fC03>
<fC03 i1="08" i2="3" l="FRE"><s0>Supernova</s0>
<s5>33</s5>
</fC03>
<fC03 i1="08" i2="3" l="ENG"><s0>Supernovae</s0>
<s5>33</s5>
</fC03>
<fC03 i1="09" i2="3" l="FRE"><s0>Formation stellaire</s0>
<s5>34</s5>
</fC03>
<fC03 i1="09" i2="3" l="ENG"><s0>Star formation</s0>
<s5>34</s5>
</fC03>
<fC03 i1="10" i2="X" l="FRE"><s0>Région formation stellaire</s0>
<s5>35</s5>
</fC03>
<fC03 i1="10" i2="X" l="ENG"><s0>Stellar formation region</s0>
<s5>35</s5>
</fC03>
<fC03 i1="10" i2="X" l="SPA"><s0>Región formación estelar</s0>
<s5>35</s5>
</fC03>
<fC03 i1="11" i2="3" l="FRE"><s0>Mélangeage</s0>
<s5>36</s5>
</fC03>
<fC03 i1="11" i2="3" l="ENG"><s0>Mixing</s0>
<s5>36</s5>
</fC03>
<fC03 i1="12" i2="3" l="FRE"><s0>Matière interstellaire</s0>
<s5>37</s5>
</fC03>
<fC03 i1="12" i2="3" l="ENG"><s0>Interstellar matter</s0>
<s5>37</s5>
</fC03>
<fC03 i1="13" i2="3" l="FRE"><s0>Etoile massive</s0>
<s5>38</s5>
</fC03>
<fC03 i1="13" i2="3" l="ENG"><s0>Massive stars</s0>
<s5>38</s5>
</fC03>
<fC03 i1="14" i2="3" l="FRE"><s0>Masse stellaire</s0>
<s5>39</s5>
</fC03>
<fC03 i1="14" i2="3" l="ENG"><s0>Stellar mass</s0>
<s5>39</s5>
</fC03>
<fC03 i1="15" i2="X" l="FRE"><s0>Fonction masse initiale</s0>
<s5>40</s5>
</fC03>
<fC03 i1="15" i2="X" l="ENG"><s0>Initial mass function</s0>
<s5>40</s5>
</fC03>
<fC03 i1="15" i2="X" l="SPA"><s0>Función masa inicial</s0>
<s5>40</s5>
</fC03>
<fC03 i1="16" i2="3" l="FRE"><s0>Accrétion stellaire</s0>
<s5>41</s5>
</fC03>
<fC03 i1="16" i2="3" l="ENG"><s0>Star accretion</s0>
<s5>41</s5>
</fC03>
<fC03 i1="17" i2="3" l="FRE"><s0>Etoile naine</s0>
<s5>42</s5>
</fC03>
<fC03 i1="17" i2="3" l="ENG"><s0>Dwarf stars</s0>
<s5>42</s5>
</fC03>
<fC03 i1="18" i2="3" l="FRE"><s0>Galaxies naines</s0>
<s5>43</s5>
</fC03>
<fC03 i1="18" i2="3" l="ENG"><s0>Dwarf galaxies</s0>
<s5>43</s5>
</fC03>
<fC03 i1="19" i2="3" l="FRE"><s0>Galaxies disques</s0>
<s5>44</s5>
</fC03>
<fC03 i1="19" i2="3" l="ENG"><s0>Disk galaxies</s0>
<s5>44</s5>
</fC03>
<fC03 i1="20" i2="3" l="FRE"><s0>Etoile type avancé</s0>
<s5>45</s5>
</fC03>
<fC03 i1="20" i2="3" l="ENG"><s0>Late type stars</s0>
<s5>45</s5>
</fC03>
<fN21><s1>312</s1>
</fN21>
<fN44 i1="01"><s1>OTO</s1>
</fN44>
<fN82><s1>OTO</s1>
</fN82>
</pA>
</standard>
</inist>
<affiliations><list><country><li>Allemagne</li>
<li>Australie</li>
<li>Canada</li>
<li>France</li>
<li>Italie</li>
<li>Pays-Bas</li>
<li>Royaume-Uni</li>
<li>Slovénie</li>
<li>États-Unis</li>
</country>
<region><li>Alsace (région administrative)</li>
<li>Angleterre</li>
<li>Angleterre de l'Est</li>
<li>Bade-Wurtemberg</li>
<li>District de Karlsruhe</li>
<li>Grand Est</li>
<li>Grand Londres</li>
<li>Groningue (province)</li>
<li>Nouvelle-Galles du Sud</li>
<li>Oxfordshire</li>
</region>
<settlement><li>Cambridge</li>
<li>Groningue (ville)</li>
<li>Heidelberg</li>
<li>Londres</li>
<li>Oxford</li>
<li>Strasbourg</li>
<li>Sydney</li>
</settlement>
<orgName><li>University College de Londres</li>
<li>Université d'Oxford</li>
<li>Université de Cambridge</li>
<li>Université de Groningue</li>
<li>Université de Sydney</li>
</orgName>
</list>
<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>
</noRegion>
<name sortKey="Campbell, R" sort="Campbell, R" uniqKey="Campbell R" first="R." last="Campbell">R. Campbell</name>
<name sortKey="Fulbright, J P" sort="Fulbright, J P" uniqKey="Fulbright J" first="J. P." last="Fulbright">J. P. Fulbright</name>
<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>
</country>
<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>
</region>
<name sortKey="Binney, J" sort="Binney, J" uniqKey="Binney J" first="J." last="Binney">J. Binney</name>
<name sortKey="Gibson, B K" sort="Gibson, B K" uniqKey="Gibson B" first="B. K." last="Gibson">B. K. Gibson</name>
<name sortKey="Seabroke, G M" sort="Seabroke, G M" uniqKey="Seabroke G" first="G. M." last="Seabroke">G. M. Seabroke</name>
</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>
</region>
<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>
</region>
<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>
</region>
<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>
</country>
<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>
</region>
</country>
<country name="Italie"><noRegion><name sortKey="Munari, U" sort="Munari, U" uniqKey="Munari U" first="U." last="Munari">U. Munari</name>
</noRegion>
</country>
<country name="Canada"><noRegion><name sortKey="Navarro, J F" sort="Navarro, J F" uniqKey="Navarro J" first="J. F." last="Navarro">J. F. Navarro</name>
</noRegion>
<name sortKey="Siviero, A" sort="Siviero, A" uniqKey="Siviero A" first="A." last="Siviero">A. Siviero</name>
</country>
<country name="Slovénie"><noRegion><name sortKey="Williams, M" sort="Williams, M" uniqKey="Williams M" first="M." last="Williams">M. Williams</name>
</noRegion>
<name sortKey="Zwitter, T" sort="Zwitter, T" uniqKey="Zwitter T" first="T." last="Zwitter">T. Zwitter</name>
<name sortKey="Zwitter, T" sort="Zwitter, T" uniqKey="Zwitter T" first="T." last="Zwitter">T. Zwitter</name>
</country>
</tree>
</affiliations>
</record>
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