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Stars in the age of micro-arc-second astrometry

Published online by Cambridge University Press:  01 October 2007

Y. Lebreton
Y. Lebreton*
Affiliation:
GEPI, UMR 8111, Observatoire de Paris-Meudon, 92195 Meudon, France email: Yveline.Lebreton@obspm.fr
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Abstract

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The understanding and modelling of the structure and evolution of stars is based on statistical physics as well as on hydrodynamics. Today, a precise identification and proper description of the physical processes at work in stellar interiors are still lacking (one key point being that of transport processes) while comparison of real stars to model predictions, which implies conversions from the theoretical space to the observational one, suffers from uncertainties in model atmospheres. This results in uncertainties on the prediction of stellar properties needed for galactic studies or cosmology (as stellar ages and masses). In the next decade, progress is expected from the theoretical, experimental and observational sides. I illustrate some of the problems we are facing when modelling stars and possible ways toward their solutions. I discuss how future observational ground-based or spatial programs (in particular those dedicated to micro-arc-second astrometry, asteroseismology and interferometry) will provide precise determinations of the stellar parameters and contribute to a better knowledge of stellar interiors and atmospheres in a wide range of stellar masses, chemical composition and evolution stages.

Keywords

stars: interiorsstars: evolutionstars: fundamental parametersstars: oscillations
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S248: A Giant Step: from Milli- to Micro-arcsecond Astrometry , October 2007 , pp. 411 - 416
Copyright
Copyright © International Astronomical Union 2008

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