The calibration of the RGB Tip as a Standard Candle: Extension to Near Infrared colors and higher metallicity

Details The calibration of the RGB Tip as a Standard Candle: Extension to Near Infrared colors and higher metallicity The calibration of the RGB Tip as a Standard Candle: Extension to Near Infrared colors and higher metallicity

2004-04-29

arxiv.org/abs/astro-ph/0404572v2

Astron.Astrophys. 424 (2004) 199-211

Astronomy and Astrophysics

Astrophysics

A&A latex, 14 pages, 7 .ps figures (fig. 1 and fig. 3 provided in low resolution version). Accepted by Astronomy & Astrophysic

Scientific paper

10.1051/0004-6361:20035910

New empirical calibrations of the Red Giant Branch Tip in the I,J,H and K bands based on two fundamental pillars, namely omega Centauri and 47 Tucanae, have been obtained by using a large optical and near infrared photometric database. Our best estimates give M_I(TRGB)= -4.05 pm 0.12, M_J(TRGB)= -5.20 pm 0.16, M_H(TRGB)= -5.94 pm 0.18 and M_K(TRGB) = -6.04 pm 0.16 at [M/H]=-1.5 (omega Cen) and M_I(TRGB)= -3.91 pm 0.13, M_J(TRGB)= -5.47 pm 0.25, M_H(TRGB)= -6.35 pm 0.30 and M_K(TRGB)= -6.56 pm 0.20 at [M/H]=-0.6 (47 Tuc). With these new empirical calibrations we also provide robust relations of the TRGB magnitude in I, J, H and K bands as a function of the global metallicity ([M/H]). It has also been shown that our calibrations self-consistently provide a distance modulus of the Large Magellanic Cloud in good agreement with the standard value ((m-M)_0 = 18.50)).

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