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The Tip of the Red Giant Branch as a Population II Distance Indicator

Published online by Cambridge University Press:  25 May 2016

Shoko Sakai
Shoko Sakai*
Affiliation:
Jet Propulsion Laboratory IPAC Caltech 100-22 Pasadena CA 91125 USA

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The period–luminosity (PL) relation of the Cepheid variable stars is the most reliable primary distance indicator for nearby galaxies, and serves as the foundation of the extragalactic distance scale, providing the firm calibration for various secondary distance indicators. However, a major disadvantage of the Cepheid distance scale is that it can only be applied to late–type systems with recent or current star formation. An alternative distance indicator is a Pop II, tip of the red giant branch (TRGB) method, which is extremely attractive because of its applicability to all morphological types of galaxies. As long as a metal–poor RGB stars are present in abundant numbers, the distance can be estimated with an accuracy that is as good as that of the Cepheid PL relation.

Type
I. Cosmological Parameters, H0, q0, Ω0 and Λ
Information
Symposium - International Astronomical Union , Volume 183: Cosmological Parameters and the Evolution of the Universe , 1999 , pp. 48 - 53
Copyright
Copyright © Kluwer 1999 

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