AustralieFrV1, Main, Exploration, bibRecord, 006937

METAL-POOR LITHIUM-RICH GIANTS IN THE RADIAL VELOCITY EXPERIMENT SURVEY

Identifieur interne : 006937 ( Main/Exploration ); précédent : 006936; suivant : 006938

METAL-POOR LITHIUM-RICH GIANTS IN THE RADIAL VELOCITY EXPERIMENT SURVEY

Auteurs : Gregory R. Ruchti [États-Unis] ; Jon P. Fulbright [États-Unis] ; Rosemary F. G. Wyse [États-Unis] ; Gerard F. Gilmore [Royaume-Uni, Arabie saoudite] ; Eva K. Grebel [Allemagne] ; Olivier Bienayme [France] ; Joss Bland-Hawthorn [Australie] ; Ken C. Freeman [Australie] ; Brad K. Gibson [Royaume-Uni, Canada] ; Ulisse Munari [Italie] ; Julio F. Navarro [Canada] ; Quentin A. Parker [Australie] ; Warren Reid [Australie] ; George M. Seabroke [Royaume-Uni] ; Arnaud Siebert [France] ; Alessandro Siviero [Italie, Allemagne] ; Matthias Steinmetz [Allemagne] ; Fred G. Watson [Australie] ; Mary Williams [Allemagne] ; Tomaz Zwitter [Slovénie]

Source :

The Astrophysical journal [ 0004-637X ] ; 2011.

RBID : Pascal:12-0058031

Descripteurs français

Pascal (Inist)
- Vitesse radiale, Etoile pauvre en métal, Abondance stellaire, Géante rouge, Gravité, Amas globulaire, Abondance élément, Mélangeage, Branche géante asymptotique, Enveloppe convective, Etoile enveloppe, Modèle, Etoile type avancé, Population type II, Amas stellaire.

English descriptors

KwdEn :
- Asymptotic giant branch, Convective shell, Element abundance, Globular clusters, Gravity, Late type stars, Metal-poor stars, Mixing, Models, Population II, Radial velocity, Red giant stars, Shell stars, Star clusters, Stellar abundance.

Abstract

We report the discovery of eight lithium-rich field giants found in a high-resolution spectroscopic sample of over 700 metal-poor stars ([Fe/H] < -0.5) selected from the Radial Velocity Experiment survey. The majority of the Li-rich giants in our sample are very metal-poor ([Fe/H] ? -1.9), and have a Li abundance (in the form of 7Li), A(Li) = log(n(Li)/n(H)) + 12, between 2.30 and 3.63, well above the typical upper red giant branch (RGB) limit, A(Li) < 0.5, while two stars, with A(Li) ˜ 1.7-1.8, show similar lithium abundances to normal giants at the same gravity. We further included two metal-poor, Li-rich globular cluster giants in our sample, namely the previously discovered M3-IV101 and newly discovered (in this work) M68-A96. This comprises the largest sample of metal-poor Li-rich giants to date. We performed a detailed abundance analysis of all stars, finding that the majority of our sample stars have elemental abundances similar to that of Li-normal halo giants. Although the evolutionary phase of each Li-rich giant cannot be definitively determined, the Li-rich phase is likely connected to extra mixing at the RGB bump or early asymptotic giant branch that triggers cool bottom processing in which the bottom of the outer convective envelope is connected to the H-burning shell in the star. The surface of a star becomes Li-enhanced as 7Be (which burns to 7Li) is transported to the stellar surface via the Cameron-Fowler mechanism. We discuss and discriminate among several models for the extra mixing that can cause Li production, given the detailed abundances of the Li-rich giants in our sample.

Affiliations:

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Le document en format XML

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</author>
<author><name sortKey="Bienayme, Olivier" sort="Bienayme, Olivier" uniqKey="Bienayme O" first="Olivier" last="Bienayme">Olivier Bienayme</name>
<affiliation wicri:level="1"><inist:fA14 i1="05"><s1>Observatoire de Strasbourg, 11 Rue de l'Université</s1>
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<author><name sortKey="Bland Hawthorn, Joss" sort="Bland Hawthorn, Joss" uniqKey="Bland Hawthorn J" first="Joss" last="Bland-Hawthorn">Joss Bland-Hawthorn</name>
<affiliation wicri:level="4"><inist:fA14 i1="06"><s1>Sydney Institute for Astronomy, School of Physics A28, University of Sydney</s1>
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<country>Australie</country>
<placeName><settlement type="city">Sydney</settlement>
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<orgName type="university">Université de Sydney</orgName>
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<author><name sortKey="Freeman, Ken C" sort="Freeman, Ken C" uniqKey="Freeman K" first="Ken C." last="Freeman">Ken C. Freeman</name>
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<s3>CAN</s3>
<sZ>9 aut.</sZ>
</inist:fA14>
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<wicri:noRegion>Halifax B3H 3C3</wicri:noRegion>
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<author><name sortKey="Navarro, Julio F" sort="Navarro, Julio F" uniqKey="Navarro J" first="Julio F." last="Navarro">Julio F. Navarro</name>
<affiliation wicri:level="1"><inist:fA14 i1="11"><s1>Department of Physics and Astronomy, University of Victoria, P.O. Box 3055, Station CSC</s1>
<s2>Victoria, BC V8W 3P6</s2>
<s3>CAN</s3>
<sZ>11 aut.</sZ>
</inist:fA14>
<country>Canada</country>
<wicri:noRegion>Victoria, BC V8W 3P6</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Parker, Quentin A" sort="Parker, Quentin A" uniqKey="Parker Q" first="Quentin A." last="Parker">Quentin A. Parker</name>
<affiliation wicri:level="1"><inist:fA14 i1="12"><s1>Australian Astronomical Observatory</s1>
<s2>Coonabarabran, NSW 2357</s2>
<s3>AUS</s3>
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<sZ>18 aut.</sZ>
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<country>Australie</country>
<wicri:noRegion>Australian Astronomical Observatory</wicri:noRegion>
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<affiliation wicri:level="1"><inist:fA14 i1="13"><s1>Department of Physics and Astronomy, Macquarie University</s1>
<s2>Sydney, NSW 2109</s2>
<s3>AUS</s3>
<sZ>12 aut.</sZ>
<sZ>13 aut.</sZ>
</inist:fA14>
<country>Australie</country>
<wicri:noRegion>Sydney, NSW 2109</wicri:noRegion>
</affiliation>
<affiliation wicri:level="1"><inist:fA14 i1="14"><s1>Macquarie Research Centre for Astronomy, Astrophysics & Astrophotonics, Macquarie University</s1>
<s2>Sydney, NSW 2109</s2>
<s3>AUS</s3>
<sZ>12 aut.</sZ>
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<country>Australie</country>
<wicri:noRegion>Sydney, NSW 2109</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Reid, Warren" sort="Reid, Warren" uniqKey="Reid W" first="Warren" last="Reid">Warren Reid</name>
<affiliation wicri:level="1"><inist:fA14 i1="13"><s1>Department of Physics and Astronomy, Macquarie University</s1>
<s2>Sydney, NSW 2109</s2>
<s3>AUS</s3>
<sZ>12 aut.</sZ>
<sZ>13 aut.</sZ>
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<country>Australie</country>
<wicri:noRegion>Sydney, NSW 2109</wicri:noRegion>
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</author>
<author><name sortKey="Seabroke, George M" sort="Seabroke, George M" uniqKey="Seabroke G" first="George M." last="Seabroke">George M. Seabroke</name>
<affiliation wicri:level="4"><inist:fA14 i1="15"><s1>Mullard Space Science Laboratory, University College London, Holmbury St. Mary</s1>
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<s3>GBR</s3>
<sZ>14 aut.</sZ>
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<country>Royaume-Uni</country>
<wicri:noRegion>Dorking RH5 6NT</wicri:noRegion>
<orgName type="university">University College de Londres</orgName>
<placeName><settlement type="city">Londres</settlement>
<region type="country">Angleterre</region>
<region type="région" nuts="1">Grand Londres</region>
</placeName>
</affiliation>
</author>
<author><name sortKey="Siebert, Arnaud" sort="Siebert, Arnaud" uniqKey="Siebert A" first="Arnaud" last="Siebert">Arnaud Siebert</name>
<affiliation wicri:level="3"><inist:fA14 i1="05"><s1>Observatoire de Strasbourg, 11 Rue de l'Université</s1>
<s2>67000 Strasbourg</s2>
<s3>FRA</s3>
<sZ>6 aut.</sZ>
<sZ>15 aut.</sZ>
</inist:fA14>
<country>France</country>
<placeName><region type="region" nuts="2">Grand Est</region>
<region type="old region" nuts="2">Alsace (région administrative)</region>
<settlement type="city">Strasbourg</settlement>
</placeName>
</affiliation>
</author>
<author><name sortKey="Siviero, Alessandro" sort="Siviero, Alessandro" uniqKey="Siviero A" first="Alessandro" last="Siviero">Alessandro Siviero</name>
<affiliation wicri:level="1"><inist:fA14 i1="16"><s1>Department of Astronomy, Padova University, Vicolo dell'Osservatorio 2</s1>
<s2>35122 Padova</s2>
<s3>ITA</s3>
<sZ>16 aut.</sZ>
</inist:fA14>
<country>Italie</country>
<wicri:noRegion>35122 Padova</wicri:noRegion>
</affiliation>
<affiliation wicri:level="1"><inist:fA14 i1="17"><s1>Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16</s1>
<s2>14482 Potsdam</s2>
<s3>DEU</s3>
<sZ>16 aut.</sZ>
<sZ>17 aut.</sZ>
<sZ>19 aut.</sZ>
</inist:fA14>
<country>Allemagne</country>
<wicri:noRegion>14482 Potsdam</wicri:noRegion>
<wicri:noRegion>An der Sternwarte 16</wicri:noRegion>
<wicri:noRegion>14482 Potsdam</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Steinmetz, Matthias" sort="Steinmetz, Matthias" uniqKey="Steinmetz M" first="Matthias" last="Steinmetz">Matthias Steinmetz</name>
<affiliation wicri:level="1"><inist:fA14 i1="17"><s1>Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16</s1>
<s2>14482 Potsdam</s2>
<s3>DEU</s3>
<sZ>16 aut.</sZ>
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<country>Allemagne</country>
<wicri:noRegion>14482 Potsdam</wicri:noRegion>
<wicri:noRegion>An der Sternwarte 16</wicri:noRegion>
<wicri:noRegion>14482 Potsdam</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Watson, Fred G" sort="Watson, Fred G" uniqKey="Watson F" first="Fred G." last="Watson">Fred G. Watson</name>
<affiliation wicri:level="1"><inist:fA14 i1="12"><s1>Australian Astronomical Observatory</s1>
<s2>Coonabarabran, NSW 2357</s2>
<s3>AUS</s3>
<sZ>12 aut.</sZ>
<sZ>18 aut.</sZ>
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<country>Australie</country>
<wicri:noRegion>Australian Astronomical Observatory</wicri:noRegion>
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<author><name sortKey="Williams, Mary" sort="Williams, Mary" uniqKey="Williams M" first="Mary" last="Williams">Mary Williams</name>
<affiliation wicri:level="1"><inist:fA14 i1="17"><s1>Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16</s1>
<s2>14482 Potsdam</s2>
<s3>DEU</s3>
<sZ>16 aut.</sZ>
<sZ>17 aut.</sZ>
<sZ>19 aut.</sZ>
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<country>Allemagne</country>
<wicri:noRegion>14482 Potsdam</wicri:noRegion>
<wicri:noRegion>An der Sternwarte 16</wicri:noRegion>
<wicri:noRegion>14482 Potsdam</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Zwitter, Tomaz" sort="Zwitter, Tomaz" uniqKey="Zwitter T" first="Tomaz" last="Zwitter">Tomaz Zwitter</name>
<affiliation wicri:level="1"><inist:fA14 i1="18"><s1>Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19</s1>
<s2>1000 Ljubljana</s2>
<s3>SVN</s3>
<sZ>20 aut.</sZ>
</inist:fA14>
<country>Slovénie</country>
<wicri:noRegion>1000 Ljubljana</wicri:noRegion>
</affiliation>
<affiliation wicri:level="1"><inist:fA14 i1="19"><s1>Center of Excellence SPACE-SI, Askerceva cesta 12</s1>
<s2>1000 Ljubljana</s2>
<s3>SVN</s3>
<sZ>20 aut.</sZ>
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<country>Slovénie</country>
<wicri:noRegion>1000 Ljubljana</wicri:noRegion>
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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="2011">2011</date>
</imprint>
</series>
</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>
</seriesStmt>
</fileDesc>
<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Asymptotic giant branch</term>
<term>Convective shell</term>
<term>Element abundance</term>
<term>Globular clusters</term>
<term>Gravity</term>
<term>Late type stars</term>
<term>Metal-poor stars</term>
<term>Mixing</term>
<term>Models</term>
<term>Population II</term>
<term>Radial velocity</term>
<term>Red giant stars</term>
<term>Shell stars</term>
<term>Star clusters</term>
<term>Stellar abundance</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Vitesse radiale</term>
<term>Etoile pauvre en métal</term>
<term>Abondance stellaire</term>
<term>Géante rouge</term>
<term>Gravité</term>
<term>Amas globulaire</term>
<term>Abondance élément</term>
<term>Mélangeage</term>
<term>Branche géante asymptotique</term>
<term>Enveloppe convective</term>
<term>Etoile enveloppe</term>
<term>Modèle</term>
<term>Etoile type avancé</term>
<term>Population type II</term>
<term>Amas stellaire</term>
</keywords>
</textClass>
</profileDesc>
</teiHeader>
<front><div type="abstract" xml:lang="en">We report the discovery of eight lithium-rich field giants found in a high-resolution spectroscopic sample of over 700 metal-poor stars ([Fe/H] < -0.5) selected from the Radial Velocity Experiment survey. The majority of the Li-rich giants in our sample are very metal-poor ([Fe/H] ? -1.9), and have a Li abundance (in the form of 7Li), A(Li) = log(n(Li)/n(H)) + 12, between 2.30 and 3.63, well above the typical upper red giant branch (RGB) limit, A(Li) < 0.5, while two stars, with A(Li) ˜ 1.7-1.8, show similar lithium abundances to normal giants at the same gravity. We further included two metal-poor, Li-rich globular cluster giants in our sample, namely the previously discovered M3-IV101 and newly discovered (in this work) M68-A96. This comprises the largest sample of metal-poor Li-rich giants to date. We performed a detailed abundance analysis of all stars, finding that the majority of our sample stars have elemental abundances similar to that of Li-normal halo giants. Although the evolutionary phase of each Li-rich giant cannot be definitively determined, the Li-rich phase is likely connected to extra mixing at the RGB bump or early asymptotic giant branch that triggers cool bottom processing in which the bottom of the outer convective envelope is connected to the H-burning shell in the star. The surface of a star becomes Li-enhanced as 7Be (which burns to 7Li) is transported to the stellar surface via the Cameron-Fowler mechanism. We discuss and discriminate among several models for the extra mixing that can cause Li production, given the detailed abundances of the Li-rich giants in our sample.</div>
</front>
</TEI>
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<li>États-Unis</li>
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<li>Angleterre</li>
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<li>Grand Est</li>
<li>Grand Londres</li>
<li>Nouvelle-Galles du Sud</li>
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<settlement><li>Cambridge</li>
<li>Heidelberg</li>
<li>Londres</li>
<li>Strasbourg</li>
<li>Sydney</li>
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<tree><country name="États-Unis"><noRegion><name sortKey="Ruchti, Gregory R" sort="Ruchti, Gregory R" uniqKey="Ruchti G" first="Gregory R." last="Ruchti">Gregory R. Ruchti</name>
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<country name="Royaume-Uni"><region name="Angleterre"><name sortKey="Gilmore, Gerard F" sort="Gilmore, Gerard F" uniqKey="Gilmore G" first="Gerard F." last="Gilmore">Gerard F. Gilmore</name>
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<name sortKey="Gibson, Brad K" sort="Gibson, Brad K" uniqKey="Gibson B" first="Brad K." last="Gibson">Brad K. Gibson</name>
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<country name="Arabie saoudite"><noRegion><name sortKey="Gilmore, Gerard F" sort="Gilmore, Gerard F" uniqKey="Gilmore G" first="Gerard F." last="Gilmore">Gerard F. Gilmore</name>
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<country name="Allemagne"><region name="Bade-Wurtemberg"><name sortKey="Grebel, Eva K" sort="Grebel, Eva K" uniqKey="Grebel E" first="Eva K." last="Grebel">Eva K. Grebel</name>
</region>
<name sortKey="Siviero, Alessandro" sort="Siviero, Alessandro" uniqKey="Siviero A" first="Alessandro" last="Siviero">Alessandro Siviero</name>
<name sortKey="Steinmetz, Matthias" sort="Steinmetz, Matthias" uniqKey="Steinmetz M" first="Matthias" last="Steinmetz">Matthias Steinmetz</name>
<name sortKey="Williams, Mary" sort="Williams, Mary" uniqKey="Williams M" first="Mary" last="Williams">Mary Williams</name>
</country>
<country name="France"><region name="Grand Est"><name sortKey="Bienayme, Olivier" sort="Bienayme, Olivier" uniqKey="Bienayme O" first="Olivier" last="Bienayme">Olivier Bienayme</name>
</region>
<name sortKey="Siebert, Arnaud" sort="Siebert, Arnaud" uniqKey="Siebert A" first="Arnaud" last="Siebert">Arnaud Siebert</name>
</country>
<country name="Australie"><region name="Nouvelle-Galles du Sud"><name sortKey="Bland Hawthorn, Joss" sort="Bland Hawthorn, Joss" uniqKey="Bland Hawthorn J" first="Joss" last="Bland-Hawthorn">Joss Bland-Hawthorn</name>
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<name sortKey="Freeman, Ken C" sort="Freeman, Ken C" uniqKey="Freeman K" first="Ken C." last="Freeman">Ken C. Freeman</name>
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<name sortKey="Parker, Quentin A" sort="Parker, Quentin A" uniqKey="Parker Q" first="Quentin A." last="Parker">Quentin A. Parker</name>
<name sortKey="Parker, Quentin A" sort="Parker, Quentin A" uniqKey="Parker Q" first="Quentin A." last="Parker">Quentin A. Parker</name>
<name sortKey="Reid, Warren" sort="Reid, Warren" uniqKey="Reid W" first="Warren" last="Reid">Warren Reid</name>
<name sortKey="Watson, Fred G" sort="Watson, Fred G" uniqKey="Watson F" first="Fred G." last="Watson">Fred G. Watson</name>
</country>
<country name="Canada"><noRegion><name sortKey="Gibson, Brad K" sort="Gibson, Brad K" uniqKey="Gibson B" first="Brad K." last="Gibson">Brad K. Gibson</name>
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<name sortKey="Navarro, Julio F" sort="Navarro, Julio F" uniqKey="Navarro J" first="Julio F." last="Navarro">Julio F. Navarro</name>
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<country name="Italie"><noRegion><name sortKey="Munari, Ulisse" sort="Munari, Ulisse" uniqKey="Munari U" first="Ulisse" last="Munari">Ulisse Munari</name>
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<name sortKey="Siviero, Alessandro" sort="Siviero, Alessandro" uniqKey="Siviero A" first="Alessandro" last="Siviero">Alessandro Siviero</name>
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<country name="Slovénie"><noRegion><name sortKey="Zwitter, Tomaz" sort="Zwitter, Tomaz" uniqKey="Zwitter T" first="Tomaz" last="Zwitter">Tomaz Zwitter</name>
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<name sortKey="Zwitter, Tomaz" sort="Zwitter, Tomaz" uniqKey="Zwitter T" first="Tomaz" last="Zwitter">Tomaz Zwitter</name>
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</tree>
</affiliations>
</record>

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METAL-POOR LITHIUM-RICH GIANTS IN THE RADIAL VELOCITY EXPERIMENT SURVEY

METAL-POOR LITHIUM-RICH GIANTS IN THE RADIAL VELOCITY EXPERIMENT SURVEY

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