AustralieFrV1, Main, Exploration, bibRecord, 005B16

LITHIUM ABUNDANCES IN CARBON-ENHANCED METAL-POOR STARS

Identifieur interne : 005B16 ( Main/Exploration ); précédent : 005B15; suivant : 005B17

LITHIUM ABUNDANCES IN CARBON-ENHANCED METAL-POOR STARS

Auteurs : Thomas Masseron [États-Unis, Belgique] ; Jennifer A. Johnson [États-Unis] ; Sara Lucatello [Italie, Allemagne] ; Amanda Karakas [Australie] ; Bertrand Plez [France] ; Timothy C. Beers [États-Unis] ; Norbert Christlieb [Allemagne]

Source :

The Astrophysical journal [ 0004-637X ] ; 2012.

RBID : Pascal:12-0348956

Descripteurs français

Pascal (Inist)
- Abondance stellaire, Etoile pauvre en métal, Etoile massive, Etoile M, Binaire spectroscopique, Etoile C, Paramètre physique, Luminosité, Modèle, Branche géante asymptotique, Population type II.

English descriptors

KwdEn :
- Asymptotic giant branch, C star, Luminosity, M stars, Massive stars, Metal-poor stars, Models, Physical parameter, Population II, Spectroscopic binary stars, Stellar abundance.

Abstract

Carbon-enhanced metal-poor (CEMP) stars are believed to show the chemical imprints of more massive stars (M ? 0.8 M_◦.) that are now extinct. In particular, it is expected that the observed abundance of Li should deviate in these stars from the standard Spite lithium plateau. We study here a sample of 11 metal-poor stars and a double-lined spectroscopic binary with -1.8 < [Fe/H] < -3.3 observed with the Very Large Telescope/UVES spectrograph. Among these 12 metal-poor stars, there are 8 CEMP stars for which we measure or constrain the Li abundance. In contrast to previous arguments, we demonstrate that an appropriate regime of dilution permits the existence of "Li-Spite plateau and C-rich" stars, whereas some of the "Li-depleted and C-rich" stars call for an unidentified additional depletion mechanism that cannot be explained by dilution alone. We find evidence that rotation is related to the Li depletion in some CEMP stars. Additionally, we report on a newly recognized double-lined spectroscopic binary star in our sample. For this star, we develop a new technique from which estimates of stellar parameters and luminosity ratios can be derived based on a high-resolution spectrum alone, without the need for input from evolutionary models.

Affiliations:

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Le document en format XML

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<front><div type="abstract" xml:lang="en">Carbon-enhanced metal-poor (CEMP) stars are believed to show the chemical imprints of more massive stars (M ? 0.8 M<sub>◦.</sub>
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LITHIUM ABUNDANCES IN CARBON-ENHANCED METAL-POOR STARS

LITHIUM ABUNDANCES IN CARBON-ENHANCED METAL-POOR STARS

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