The "Tip" of the Red Giant Branch as a distance indicator: theoretical calibration and the value of H_0

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dc.creatorCassisi, S.
dc.creatorSalaris, M.
dc.date1997-10-15
dc.date.accessioned2026-07-07T02:24:34Z
dc.date.available2026-07-07T02:24:34Z
dc.descriptionUpdated theoretical relations for the run of the bolometric and I magnitude of the Tip of the Red Giant Branch (TRGB) with respect to the metallicity are provided. An analogous relation for the V magnitude of the Zero Age Horizontal Branch at the RR Lyrae instability strip is also provided. A comparison has been performed among our ZAHB and TRGB distances, the Cepheid distance scale by Madore & Freedman (1991) and the HIPPARCOS distances set by local subdwarfs with accurate parallax determinations. The application of our TRGB distance scale to NGC3379 provides a distance to the Leo I group that is about 8% higher than the one obtained by Sakai et al. (1997) adopting the TRGB brightness calibration by Da Costa & Armandroff (1990). Our distance to the Leo I group, coupled with the relative distance Coma cluster-Leo I, provides a determination of H_0 at the Coma cluster: H_0=64_{-9}^{+10} Km s^{-1} Mpc^{-1}.
dc.description10 pages including 4 figures, gzip postscript file, To be published in "Views on distance indicators" MemSaIt 1998
dc.identifierhttps://arxiv.org/abs/astro-ph/9710166
dc.identifierhttp://arxiv.org/abs/astro-ph/9710166
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/11650
dc.subjectAstrophysics
dc.titleThe "Tip" of the Red Giant Branch as a distance indicator: theoretical calibration and the value of H_0
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