Issue |
A&A
Volume 429, Number 2, January II 2005
|
|
---|---|---|
Page(s) | 613 - 624 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361:20041757 | |
Published online | 17 December 2004 |
New estimates of the contribution of Wolf-Rayet stellar winds
to the Galactic
Al
1
Institut d'Astronomie et d'Astrophysique de l'Université Libre de Bruxelles, 226 Bd du Triomphe, 1050 Brussels, Belgium e-mail: palacios@astro.ulb.ac.be
2
Observatoire de Genève, 51 Chemin des Maillettes, 1290 Sauverny, Switzerland e-mail: Georges.Meynet@obs.unige.ch
3
Laboratoire d'Astrophysique de l'EPFL - Observatoire, 1290 Chavannes-des-Bois, Switzerland
4
Centre d'Étude Spatiale des Rayonnements - 9, Av. du Colonel Roche, BP 4346, 31028 Toulouse Cedex 4, France
5
Laboratoire d'Astrophysique de Toulouse-Tarbes, 14 avenue Edouard Belin, 31400 Toulouse, France
6
Instituto de Astrofísica de Andalucía (CSIC) - Camino bajo de Huétor 24, Apdo. 3004, 18080 Granada, Spain
7
INTEGRAL Science Data Center, Chemin d'Ecogia 16, 1290 Versoix, Switzerland
Received:
30
July
2004
Accepted:
13
August
2004
We present new yields of from Wolf-Rayet stellar winds
based on rotating stellar models which account well for numerous
observed properties of massive stars. We study the impacts on the yields
of a change of initial mass, metallicity and initial rotation
velocity. We also consider the effects of a change of mass loss rates
during the Wolf-Rayet phase.
We show that for surface rotation velocities during the core H-burning
phase matching to the observed ones, the quantity of
ejected by a
star of a given initial mass and metallicity is roughly doubled when the
effects of rotation are taken into account. The metallicity dependence
of the yield is, on the other hand, very similar to that obtained from
non-rotating models.
We estimate that at least about 20% to 50% (e.g. ~
) of the live
detected in the Milky-Way originates
from Wolf-Rayet stellar winds. We show the importance of a good
knowledge of the present metallicity gradient and star formation rate in
our galaxy for modeling both the variation of the
surface density
with the galactocentric distance and the global contribution of the
Wolf-Rayet stellar winds to the present galactic mass of
.
Key words: nuclear reactions, nucleosynthesis, abundances / stars: rotation / Galaxy: abundances / stars: Wolf-Rayet / stars: abundances
© ESO, 2005
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