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Date and Time of the Query: 2019-08-24 T20:58:55 PDT
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For refcode 1997MNRAS.289..406S:
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Copyright by Royal Astronomical Society. 1997MNRAS.289..406S The `tip' of the red giant branch as a distance indicator: results from evolutionary models Maurizio Salaris and Santi Cassisi Accepted 1997 March 13. Received 1997 March Sin original form 1996 December 17 ABSTRACT New theoretical evaluations of the red giant branch tip (TRGB) luminosity, obtained by adopting the most recent physical inputs in the computing of canonical stellar models, are presented. Theoretical relations for the variation of the TRGB bolometric and I magnitude with the metallicity are provided, together with a comparison of the distance scale based on these relations the RR Lyrae distance scale presented in Cassisi & Salaris, and the Cepheid distance scale adopted by Lee, Freedman & Madore. This comparison - performed by adopting a sample of Galactic globular clusters and a sample of resolved galaxies - discloses a satisfactory agreement between theory and observations at the level of 0.1 mag. This occurrence can be regarded as evidence for consistency between the theoretical red giant horizontal branch stellar models and independent Cepheid observations, and allows us to safely use the provided TRGB luminosity relations as an alternative primary distance indicator for galaxies in which the stellar component has been resolved. Key words: stars: evolution - stars: interiors - globular clusters: general - galaxies: distances and redshifts.
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