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Luminosity Calibrations with Hipparcos: Theoretical Point of View

Published online by Cambridge University Press:  30 March 2016

Yveline Lebreton
Yveline Lebreton*
Affiliation:
Observatoire de Paris, DASGAL, UMR 8633, 92195 Meudon, France

Abstract

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Hipparcos provided us with valuable observational material that can be used to anchor more firmly the Galactic and extragalactic distance scales. A calibration which is applicable to all stars must allow for differences in chemical composition and other properties, which may require the use of theoretical models. I discuss some difficulties encountered in the calibration procedure that are related (1) to the determinations of stellar temperatures, luminosities and chemical compositions, (2) to remaining weaknesses of theoretical stellar models, and (3) to the transformations of the model outputs from the (Mbol, Teff) plane into any colour-magnitude or colour-colour diagram.

Type
II. Joint Discussions
Information
Highlights of Astronomy , Volume 12: Highlights of Astronomy. As presented at the XXIVth General Assembly of the IAU, 2000 , 2002 , pp. 669 - 672
Copyright
Copyright © Astronomical Society of Pacific 2002

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