New estimates of the contribution of Wolf--Rayet stellar winds to the Galactic 26Al

Abstract

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 Msun) 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.

arXiv comment12 pages, 8 figures. Replaced version with corrected typos and references, and figure 4 replaced. To be published in Astronomy & Astrophysics

References in corpus (18)

• Mass-loss predictions for O and B stars as a function of metallicity
• Nucleosynthesis in Massive Stars With Improved Nuclear and Stellar Physics
• The evolution of rotating stars
• Stellar evolution with rotation VIII: Models at Z = 10^{-5} and CNO yields for early galactic evolution
• Stellar evolution with rotation XI: Wolf-Rayet star populations at different metallicities
• Stellar evolution with rotation X: Wolf-Rayet star populations at solar metallicity
• Presupernova Evolution of Rotating Massive Stars II: -- Evolution of the Surface Properties
• Stellar evolution with rotation VII: Low metallicity models and the blue to red supergiant ratio in the SMC
• Evolution, Explosion and Nucleosynthesis of Core Collapse Supernovae
• Morphology of the Interstellar Cooling Lines Detected by COBE
• Stellar and Wind Properties of LMC WC4 stars - A metallicity dependence for Wolf-Rayet mass-loss rates
• 26Al and 60Fe From Supernova Explosions
• Spatial distribution of Galactic HII regions
• Stellar Iron Abundances at the Galactic Center
• On the relative frequencies of core-collapse supernovae sub-types: the role of progenitor metallicity
• Gamma-ray line emission from OB associations and young open clusters. II. The Cygnus region
• Radioactive Al26 and Fe60 in the Milky Way: implications of the RHESSI detection of Fe60
• 26Al yields from rotating Wolf--Rayet star models

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