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Constraints on the variations of fundamental couplings by stellar models

Published online by Cambridge University Press:  21 October 2010

A. Coc ,
S. Ekström ,
P. Descouvemont  and
E. Vangioni
A. Coc
Affiliation:
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
S. Ekström
Affiliation:
Geneva Observatory, University of Geneva, Maillettes 51, 1290 Sauverny, Switzerland
P. Descouvemont
Affiliation:
Physique Nucléaire Théorique et Physique Mathématique, C.P. 229, Université Libre de Bruxelles (ULB), B-1050 Brussels, Belgium
E. Vangioni
Affiliation:
Institut dAstrophysique de Paris, UMR-7095 du CNRS, Université Pierre et Marie Curie, 98 bis bd Arago, 75014 Paris, France
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Abstract

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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.

Keywords

cosmology: theoryPop III starsnuclear reactionsnucleosynthesisabundances
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Highlights H15: Highlights of Astronomy , November 2009 , pp. 306
Copyright
Copyright © International Astronomical Union 2010

References

Coc, A., Ekström, S., Descouvemont, P., Meynet, G., Olive, K., Uzan, J.-Ph., & Vangioni, E., proceedings of JD 9 IAU Symposium, Rio 2009, to appear in Mem. S.A. It.Google Scholar
Ekström, S., Coc, A., Descouvemont, P., Meynet, G., Olive, K., Uzan, J.-Ph., & Vangioni, E., 2009 in preparation.Google Scholar