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Absolute Luminosities of Stellar Candles

Published online by Cambridge University Press:  25 September 2002

O. Bienaymé ,
C. Turon ,
X. Luri ,
F. Figueras  and
J. Torra
X. Luri
Affiliation:
Dept. Astronomia, Universitat de Barcelona, Diagonal 647, 08028 Barcelona, Spain Institut d'Estudis Espacials de Catalunya, Spain
F. Figueras
Affiliation:
Dept. Astronomia, Universitat de Barcelona, Diagonal 647, 08028 Barcelona, Spain Institut d'Estudis Espacials de Catalunya, Spain
J. Torra
Affiliation:
Dept. Astronomia, Universitat de Barcelona, Diagonal 647, 08028 Barcelona, Spain Institut d'Estudis Espacials de Catalunya, Spain
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Abstract

Stellar candles are the basic tools to determine the extragalacticdistance scale. Its use relies on some given fundamentalrelation that allows to estimate the absolute magnitude of an objectfrom observable parameters and from that its distance. The Hipparcosmission greatly contributed to the refinement of these fundamentalrelations, but even with its milliarcsecond-precision data, theuncertainties in the calibration of Stellar Candles are still high. Toimprove these results larger samples and higher astrometric precisionare needed. GAIA, with its microarcsecond, one-billion objectscatalogue, will provide all the necessary data for this task.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 2: GAIA: A European Space Project , 2002 , pp. 171 - 178
Copyright
© EAS, EDP Sciences, 2002

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