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Astron. Astrophys. 330, L25-L28 (1998)


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Letter to the Editor

A first HIPPARCOS contribution to the light elements problem *

F. Crifo , M. Spite and F. Spite

Observatoire de Paris, Section de Meudon, DASGAL, URA 335 du CNRS, Place Janssen, F-92195 Meudon, France

Received 26 May 1997 / Accepted 5 August 1997

Abstract

The interpretation of the observations of the light elements requires the knowledge of the evolutionary status of the observed stars. The HIPPARCOS accurate parallaxes solve several cases of ambiguous status. For example, it is shown that, since HD 84937 is a subgiant, its [FORMULA] abundance is compatible with the predictions of the standard models of Big Bang nucleosynthesis and of stellar evolution. Also the non-detection of [FORMULA] in Population II dwarfs is in agreement with these predictions. In order to reach more precise lithium abundances, more reliable temperature scales, and, more generally, better stellar models, are necessary.

Key words: stars: abundances – stars: atmospheres – astrometry

* Based on data from the ESA Hipparcos astrometry satellite

© European Southern Observatory (ESO) 1998

Online publication: January 16, 1998
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