On the Nature of the Core of alpha Centauri A: The Impact of the Metallicity Mixture

• Type: Article in International Scientific Journal
• Date: 2019

Authors

Nsamba, B (Author) Other; Campante, TL (Author) Other; Monteiro, MJPFG (Author) FCUP; Cunha, MS (Author) Other; Sousa, SG (Author) Other

Journal

Title: Frontiers in Astronomy and Space Sciences

Vol. 6

Publisher: FRONTIERS MEDIA SA

Indexing

ISI Web of Knowledge - 5 Citations

Scopus - 4 Citations

Other information

Authenticus ID: P-00Q-HGA

DOI: 10.3389/fspas.2019.00025

Abstract (EN): Forward asteroseismic modeling plays an important role toward a complete understanding of the physics taking place in deep stellar interiors. With a dynamical mass in the range over which models develop convective cores while in the main sequence, the solar-like oscillator a Centauri A presents itself as an interesting case study. We address the impact of varying the metallicity mixture on the determination of the energy transport process at work in the core of a Centauri A. We find that greater than or similar to 70% of models reproducing the revised dynamical mass of alpha Centauri A have convective cores, regardless of the metallicity mixture adopted. This is consistent with the findings of Nsamba et al., where nuclear reaction rates were varied instead. Given these results, we propose that a Centauri A be adopted in the calibration of stellar model parameters when modeling solar-like stars with convective cores.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8