Bibcode
Palacios, A.; Meynet, G.; Vuissoz, C.; Knödlseder, J.; Schaerer, D.; Cerviño, M.; Mowlavi, N.
Bibliographical reference
Astronomy and Astrophysics, v.429, p.613-624 (2005)
Advertised on:
1
2005
Journal
Citations
69
Refereed citations
61
Description
We present new yields of 26Al 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
26Al 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. ˜0.6-1.4
M⊙) of the live 26Al 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
26Al surface density with the galactocentric distance and the
global contribution of the Wolf-Rayet stellar winds to the present
galactic mass of 26Al.