Aluminium-26 from massive binary stars II. Rotating single stars up to core-collapse and their impact on the early Solar System
arXiv:2109.05842 · doi:10.3847/1538-4357/ac25ea
Abstract
Radioactive nuclei were present in the early Solar System, as inferred from analysis of meteorites. Many are produced in massive stars, either during their lives or their final explosions. In the first paper in this series (Brinkman et al. 2019), we focused on the production of Al in massive binaries. Here, we focus on the production of another two short-lived radioactive nuclei, Cl and Ca, and the comparison to the early Solar System data. We used the MESA stellar evolution code with an extended nuclear network and computed massive (10-80 M), rotating (with initial velocities of 150 and 300 km/s) and non-rotating single stars at solar metallicity (Z=0.014) up to the onset of core collapse. We present the wind yields for the radioactive isotopes Al, Cl, and Ca, and the stable isotopes F and Ne. In relation to the stable isotopes, we find that only the most massive models, 60M and 40M give positive F and Ne yields, respectively, depending on the initial rotation rate. In relation to the radioactive isotopes, we find that the early Solar System abundances of Al and Ca can be matched with by models with initial masses 40M, while Cl is matched only by our most massive models, 60M. Fe is not significantly produced by any wind model, as required by the observations. Therefore, massive star winds are a favoured candidate for the origin of the very short-lived Al, Cl, and Ca in the early Solar System.
18 pages, 8 figures, 3 tables
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