Issue |
A&A
Volume 433, Number 3, April III 2005
|
|
---|---|---|
Page(s) | 1013 - 1022 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361:20041554 | |
Published online | 29 March 2005 |
Yields of rotating stars at solar metallicity
Geneva Observatory, 1290 Sauverny, Switzerland e-mail: raphael.hirschi@obs.unige.ch
Received:
29
June
2004
Accepted:
30
November
2004
We present a new set of stellar yields obtained from
rotating stellar models at solar metallicity covering the
massive star range (12-60 ). The stellar models were
calculated with
the latest version of the Geneva stellar evolution code
described in Hirschi et al. (2004).
Evolution and nucleosynthesis are in general followed up to silicon
burning.
The yields of our non-rotating models are consistent
with other calculations and differences can be understood in the light
of the treatment of convection and the rate used for
12C
O. This verifies the accuracy of our
calculations and gives a safe basis for studying the effects of rotation
on the yields.
The contributions from stellar winds and
supernova explosions to the stellar yields are presented separately.
We then add the two contributions to compute the total stellar yields.
Below
, rotation increases the
total metal yields, Z, and in particular the yields of carbon and oxygen
by a factor of 1.5-2.5.
As a rule of thumb, the yields of a rotating 20
star are similar
to the yields of a non-rotating 30
star, at least for the light
elements considered in this work.
For very massive stars (
),
rotation increases the yield of helium but does not significantly
affect the yields of heavy elements.
Key words: stars: abundances / stars: evolution / stars: rotation / stars: Wolf-Rayet / stars: supernovae: general
© ESO, 2005
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