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September 17, 2025The Astrophysical Journal5 citationsOpen Access

The Role of Rotation on the Yields of the Two γ-Ray Emitters 26Al and 60Fe Ejected by Massive Stars

AFAgnese FallaAstronomical Observatory of Rome LRLorenzo RobertiIstituto Nazionale di Fisica Nucleare MLMarco LimongiAstronomical Observatory of Rome

Key Points

Incorporating rotation into stellar models significantly increases the predicted flux ratio of 60Fe to 26Al.
The observed flux ratio of 0.24 ± 0.04 aligns with models that consider rotation, unlike nonrotating ones yielding 0.062.
The models are based on a refined initial velocity distribution of rotating massive stars, enhancing accuracy.
This study suggests rotation is critical for understanding nucleosynthesis in massive stars.

Abstract

Abstract We show that the observed 60 Fe/ 26 Al flux ratio provided by the SPectrometer on INTEGRAL satellite (0.24 ± 0.04) can be reproduced only if rotation is taken into account in the computation of the stellar models. Predictions from nonrotating stellar models yield a significantly lower ratio (0.062), which is incompatible with the observed value. The adopted models and the associated yields are based on a combination of models already published by M. Limongi & A. Chieffi, complemented by additional ones fully consistent with the original grid, allowing a finer resolution in the initial rotational velocity distribution.

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