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Theoretical Expectations for Clump Red Giants as Distance Indicators

Published online by Cambridge University Press:  30 March 2016

Léo Girardi
Léo Girardi*
Affiliation:
Dipartimento di Astronomia, Vicolo dell’Osservatorio 5, 1-35122 Padova, Italy

Abstract

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Variations of ~ 0.4 mag are expected in the I-band absolute magnitude of red clump giants, , as a function of both stellar age and metallicity. This is the case regardless of some potential theoretical uncertainties. The quite large differences in mean ages and metallicities of clump stars among galaxies result in systematic changes (of up to ~ 0.4 mag) in their . These numbers also indicate a distance to the LMC that is not necessarily “short”.

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. 689 - 693
Copyright
Copyright © Astronomical Society of Pacific 2002

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