A new calibration of the RGB Tip as a Standard Candle

Details A new calibration of the RGB Tip as a Standard Candle A new calibration of the RGB Tip as a Standard Candle

2001-10-30

arxiv.org/abs/astro-ph/0110645v1

Astronomy and Astrophysics

Astrophysics

6 pages, 2 .ps figures, latex, hrd_pasp.sty macro included. To appear in "Observed HR diagrams and stellar evolution: the inte

Scientific paper

We have obtained an accurate estimate of the absolute I magnitude of the Tip of the Red Giant Branch (M_I(TRGB)) for the globular cluster Omega Cen, based {\em (a)} on the largest photometric database ever assembled for a globular, by Pancino et al. (2000), and {\em (b)} on a direct distance estimate for \omen, recently obtained by Thompson et al.(2001) from a detached eclipsing binary. The derived value M_I(TRGB) = -4.04\pm 0.12 provides, at present, the most accurate empirical zero-point for the calibration of the \mtip -- [Fe/H] relation, at [Fe/H] ~ -1.7.

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