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Astron. Astrophys. 323, L9-L12 (1997)

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Letter to the Editor

A Reestimate of the Protosolar (2H/1H)p ratio from (3He/4He)sw solar wind measurements

D. Gautier 1 and P. Morel 2

1 DESPA, URA CNRS 264, Observatoire de Paris-Meudon, F-92195 Meudon Principal CEDEX, France.
2 Département Cassini, UMR CNRS 6529, Observatoire de la Côte d'Azur, BP 4229, F-06304 Nice CEDEX 4, France.

Received 10 January 1997 / Accepted 1 April 1997

Abstract

We reanalyze the inference of the protosolar abundance of deuterium made by Geiss (1993) from measurements of [FORMULA] in the solar wind. We use an evolutionary solar model with microscopic diffusion, constrained to fit the present age, radius and luminosity, as well as the observed ratio of heavy elements to hydrogen. The protosolar [FORMULA] is obtained from the best fit of [FORMULA]. Taking for the protosolar [FORMULA] the value measured in Jupiter by the Galileo probe (Niemann et al. 1996), we derive [FORMULA] [FORMULA]. Compared to the present interstellar medium value (Linsky et al. 1993), this result is compatible with models of the chemical evolution of the Galaxy in the solar neighborhood; it is also marginally compatible with the Jovian [FORMULA] [FORMULA] ratio measured by Galileo.

Key words: Nuclear reactions, nucleosynthesis, abundances – Sun: abundances – Solar system: formation

Send offprint requests to: gautier@meudon.obspm.fr

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© European Southern Observatory (ESO) 1997

Online publication: June 5, 1998

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