Issue |
A&A
Volume 450, Number 3, May II 2006
|
|
---|---|---|
Page(s) | 1173 - 1179 | |
Section | Stellar atmospheres | |
DOI | https://doi.org/10.1051/0004-6361:20053485 | |
Published online | 19 April 2006 |
Lithium abundances and rotational behavior for bright giant stars
1
Groupe de Recherche en Astronomie et Astrophysique du Languedoc, UMR 5024/ISTEEM (CNRS), Université de Montpellier II, Place Bataillon, 34095 Montpellier, France e-mail: lebre@graal.univ-montp2.fr
2
Observatoire de la Côte d'Azur, Département Cassiopée, UMR 6202 (CNRS), BP 4229, 06304 Nice, France
3
Departamento de Física, Universidade Federal do Rio Grande do Norte, 59072-970 Natal, RN, Brazil
Received:
20
May
2005
Accepted:
16
November
2005
Aims.We study the links possibly existing between the lithium content of bright giant stars and their rotational velocity.
Methods.We performed a spectral analysis of 145 bright giant stars (luminosity class II) spanning the spectral range from F3 to K5. All these stars have homogeneous rotational velocity measurements available in the literature.
Results.For all the stars of the sample, we provide consistent lithium
abundances (ALi), effective temperatures (Teff), projected rotational
velocity (), mean metallicity ([Fe/H]), stellar mass, and an indication
of the stellar multiplicity. The gradual decrease in lithium abundance
with Teff is confirmed for bright giant stars, and it points
to a dilution factor that is at least as significant as in giant stars. From the F
to K spectral types, the ALi spans at least
three orders of magnitude, reflecting the effects of stellar mass
and evolution on dilution.
Conclusions.We find that the behavior of ALi as a function of in bright giant stars
presents the same trend as is observed in giants and subgiants:
stars with high ALi are moderate or fast rotators, while stars with low
ALi show a wide range of
values.
© ESO, 2006
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