The 'tip' of the red giant branch as a distance indicator: results from evolutionary models | Zendy

Maurizio Salaris | Zendy; S. Cassisi | Zendy

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The 'tip' of the red giant branch as a distance indicator: results from evolutionary models

Author(s) -

Maurizio Salaris,

S. Cassisi

Publication year - 1997

Publication title -

monthly notices of the royal astronomical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.058

H-Index - 383

eISSN - 1365-8711

pISSN - 0035-8711

DOI - 10.1093/mnras/289.2.406

Subject(s) - cepheid variable , physics , red giant branch , rr lyrae variable , astrophysics , globular cluster , horizontal branch , galaxy , metallicity , cosmic distance ladder , luminosity , red clump , local group , astronomy , dwarf galaxy , stars , redshift

New theoretical evaluations of the Red Giant Branch Tip (TRGB) luminosity, byadopting the most updated physical inputs in computing canonical stellarmodels, are presented. Theoretical relations for the run of the TRGB bolometricand I magnitude with the metallicity are provided together with a comparison ofthe distance scale based on these relations and the RR Lyrae distance scalepresented in Cassisi & Salaris (1996) and the Cepheid distance scale adopted byLee, Freedman & Madore (1993). The result of this comparison - performed byadopting a sample of galactic globular clusters and a sample of resolvedgalaxies - discloses a satisfactory agreement between theory and observationsat the level of 0.1 mag. This occurrence can be regarded as an evidence for theconsistency between theoretical Red Giant, Horizontal Branch stellar models andindependent Cepheid observations, and allows to safely use the provided TRGBluminosity relations as an alternative primary distance indicator for galaxiesin which the stellar component has been resolved.Comment: 9 pages, 4 figures, Tex file, mnrass.sty style included. To appear in MNRA

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