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Stellar parameters through high precision parallaxes

Published online by Cambridge University Press:  01 October 2007

C. Jordi
Affiliation:
Departament d'Astronomia i Meteorologia. Universitat de Barcelona-IEECMartí Franqués 1, E-08028 Barcelona, Spain, email: carme@am.ub.es
C. Fabricius
Affiliation:
Departament d'Astronomia i Meteorologia. Universitat de Barcelona-IEECMartí Franqués 1, E-08028 Barcelona, Spain, email: carme@am.ub.es
J. M. Carrasco
Affiliation:
Departament d'Astronomia i Meteorologia. Universitat de Barcelona-IEECMartí Franqués 1, E-08028 Barcelona, Spain, email: carme@am.ub.es
F. Figueras
Affiliation:
Departament d'Astronomia i Meteorologia. Universitat de Barcelona-IEECMartí Franqués 1, E-08028 Barcelona, Spain, email: carme@am.ub.es
E. Masana
Affiliation:
Departament d'Astronomia i Meteorologia. Universitat de Barcelona-IEECMartí Franqués 1, E-08028 Barcelona, Spain, email: carme@am.ub.es
H. Voss
Affiliation:
Departament d'Astronomia i Meteorologia. Universitat de Barcelona-IEECMartí Franqués 1, E-08028 Barcelona, Spain, email: carme@am.ub.es
X. Luri
Affiliation:
Departament d'Astronomia i Meteorologia. Universitat de Barcelona-IEECMartí Franqués 1, E-08028 Barcelona, Spain, email: carme@am.ub.es
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Abstract

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Before Hipparcos, the determination of absolute luminosity was usually done through calibrations based on a few stellar parallaxes measured at the highest precision. The Hipparcos mission meant a giant step on the knowledge of luminosities and fine structure of the HR diagram. The Gaia mission will go an enormous step further. Besides luminosities, Gaia will allow us to derive other stellar parameters like temperature and extinction, gravity, chemical composition, age and mass by the combination of astrometric and spectrometric data. Through simulations during the mission preparation, it has been shown that the astrometric parallax information is essential to deal with the degeneracy between gravity and chemical composition ([Fe/H] and [α/Fe]), that cannot be treated using only spectrophotometry. We show the expected HR diagram for the Gaia domain and the accuracies of stellar parameters.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2008

References

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