A Study of the Abundance of Aluminium in Massive Stars

Abstract

Abstract: This study presents the results of the calculation of the mass fractions of isotopes from hydrogen to nickel during the entire core burning phases of a 25 M_⊙ star. A simple stellar model was used, considering four main parameters: temperature, density, initial composition, and time, without accounting for mass loss or mixing. The mass fractions of the isotopes were calculated using the open-source package NucNet Tools and the updated reaction rates from the JINA Reaclib database. A comparison of our results with existing similar data is performed and acceptable agreement is conspicuous. Hydrodynamic conditions in massive stars favor the production of ²⁶Al, therefore particular attention was given to the isotopes ²⁶Al and ²⁷Al and the ratio of their mass fractions  for comparison with the literature. The averaged value of the controversial  during the star's lifetime is found to be 1.68×10^-4.