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- Implications of Boron Surface Abundances in Massive Stars
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Implications of Boron Surface Abundances in Massive Stars
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The evolution of massive stars can be influenced by rotationally induced internal mixing, for which surface boron abundances can serve as a key indicator. We compare rotating single star models to observational data from massive stars with boron observation. Through a Bayesian analysis, we find that about two-thirds of the stars in our sample are well represented by the models, confirming the existence of rotational mixing in radiative stellar envelopes. They were well represented by the models with 50% weaker rotational mixing than the widely adopted one. However, one-third of the stars, which are mostly boron-depleted slow rotators, do not fit the models, suggesting that these stars may have experienced a different boron depletion mechanism or formation channel, such as a binary merger.
This work is distributed under the Creative Commons CC BY 4.0 Licence.
Paper presented at the 41st Liège International Astrophysical Colloquium on “The eventful life of massive star multiples,” University of Liège (Belgium), 15–19 July 2024.
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About: Harim Jin
email : hjin@astro.uni-bonn.de