2005A&A...443..243P -
Astronomy and Astrophysics, volume 443, 243-250 (2005/11-3)
The thermonuclear production of 19F by Wolf-Rayet stars revisited.
PALACIOS A., ARNOULD M. and MEYNET G.
Abstract (from CDS):
New models of rotating and non-rotating stars are computed for initial masses between 25 and 120M
☉ and for metallicities Z=0.004, 0.008, 0.020, and 0.040 with the aim of reexamining the wind contribution of Wolf-Rayet (WR) stars to the
19F enrichment of the interstellar medium. Models with an initial rotation velocity υ
i=300km/s are found to globally eject less
19F than the non-rotating models. We compare our new predictions with those of Meynet & Arnould (
2000A&A...355..176M), and demonstrate that the
19F yields are very sensitive to the still uncertain
19F(α,p)
22Ne rate and to the adopted mass loss rates. Using the recommended mass loss rate values that take into account the clumping of the WR wind and the NACRE reaction rates, when available, we obtain WR
19F yields that are significantly lower than predicted by Meynet & Arnould (
2000A&A...355..176M) and that would make WR stars non-important contributors to the galactic
19F budget. In view, however, of the large nuclear and mass loss rate uncertainties, we consider that the question of the WR contribution to the galactic
19F remains quite open.
Abstract Copyright:
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Journal keyword(s):
stars: interiors - stars: rotation - stars: abundances - nucleosynthesis, nuclear reactions, abundances
Simbad objects:
1
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