Fulltext

Constraints on the variations of fundamental couplings by stellar models

Coc, A. ; Ekström, S. ; Descouvemont, P. ; Vangioni, E.

In: Proceedings of the International Astronomical Union, 2009, vol. 5, no. H15, p. 306-306

Aggiungi alla tua lista
    Titre
    • Constraints on the variations of fundamental couplings by stellar models
    Auteur
    • Coc, A.. Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), UMR 8609, CNRS/IN2P3 and Université Paris Sud 11, Bâtiment 104, 91405 Orsay Campus, France
    • Ekström, S.. Geneva Observatory, University of Geneva, Maillettes 51, 1290 Sauverny, Switzerland
    • Descouvemont, P.. Physique Nucléaire Théorique et Physique Mathématique, C.P. 229, Université Libre de Bruxelles (ULB), B-1050 Brussels, Belgium
    • Vangioni, E.. Institut dAstrophysique de Paris, UMR-7095 du CNRS, Université Pierre et Marie Curie, 98 bis bd Arago, 75014 Paris, France
    Type de document
    • Postprint
    Langue
    • Inglese
    Publié dans
    • Proceedings of the International Astronomical Union, 2009, vol. 5, no. H15, p. 306-306. Cambridge University Press
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:295096
    Summary
    The effect of variations of the fundamental constants on the thermonuclear rate of the triple alpha reaction, 4He(αα,γ)12C, that bridges the gap between 4He and 12C is investigated. We follow the evolution of 15 and 60 M⊙ zero metallicity star models, up to the end of core helium burning. They are assumed to be representative of the first, Population III stars undergoing a very peculiar evolution due to the absence of initial CNO elements (zero metallicity). The calculated oxygen and carbon abundances resulting from helium burning can then be used to constrain the variations of the fundamental constants