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Titolo:
LITHIUM ABUNDANCE OF HALO DWARFS REVISED
Autore:
MOLARO P; PRIMAS F; BONIFACIO P;
Indirizzi:
OSSERV ASTRON TRIESTE,VIA G B TIEPOLO 11 I-34131 TRIESTE ITALY UNIV TRIESTE,DIPARTIMENTO ASTRON I-34131 TRIESTE ITALY
Titolo Testata:
Astronomy and astrophysics
fascicolo: 3, volume: 295, anno: 1995,
pagine: 47 - 50
SICI:
0004-6361(1995)295:3<47:LAOHDR>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
STARS;
Keywords:
STARS; ABUNDANCES; STARS, POPULATION II; STARS, FUNDAMENTAL PARAMETERS; GALAXY, HALO; COSMOLOGY, OBSERVATIONS;
Tipo documento:
Letter
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
14
Recensione:
Indirizzi per estratti:
Citazione:
P. Molaro et al., "LITHIUM ABUNDANCE OF HALO DWARFS REVISED", Astronomy and astrophysics, 295(3), 1995, pp. 47-50

Abstract

Lithium abundances in a sample of halo dwarfs have been redetermined by using the new T(eff) derived by Fuhrmann et al (1994) from modelling of the Balmer lines. These T(eff) are reddening independent, homogeneous and of higher quality than those based on broad band photometry. Abundances have been derived by generating new atmospheric models by using the ATLAS-9 code by Kurucz (1993) with enhanced alpha-elements and without the overshooting option. The revised abundances show a remarkably flat plateau in the Li-T(eff) plane for T(eff) > 5700 K with no evidence of trend with T(eff) or falloff at the hottest edge. Li abundances are not correlated with metallicity for [Fe/H]< -1.4 in contrastwith Thorburn (1994). All the determinations are consistent with the same pristine lithium abundance and the errors estimated for individual stars fully account for the observed dispersion. The weighted average Li value for the 24 stars of the plateau with T(eff) > 5700 K and [Fe/H] less-than-or-equal-to -1.4, is [Li] = 2.210 +/- 0.013, or 2.224 when non-LTE corrections by Carlsson et al (1994) are considered.

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Documento generato il 24/09/20 alle ore 01:40:38