The distance to the Leo I dwarf spheroidal galaxy from the Red Giant Branch Tip

Details The distance to the Leo I dwarf spheroidal galaxy from the Red Giant Branch Tip The distance to the Leo I dwarf spheroidal galaxy from the Red Giant Branch Tip

2004-07-21

arxiv.org/abs/astro-ph/0407444v1

Astronomy and Astrophysics

Astrophysics

6 pages, 5 figures, Fig. 1 and 2 provided in low resolution version. Latex. Accepted for publication by MNRAS

Scientific paper

10.1111/j.1365-2966.2004.08226.x

We present V and I photometry of a 9.4 arcmin X 9.4 arcmin field centered on the dwarf spheroidal galaxy Leo I. The I magnitude of the tip of the Red Giant Branch is robustly estimated from two different datasets (I^{TRGB}=17.97 +0.05/-0.03). From this estimate, adopting [M/H]=-1.2 from the comparison of RGB stars with Galactic templates, we obtain a distance modulus (m-M)_0=22.02 +/- 0.13, corresponding to a distance D=254 +16/-19 Kpc.

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