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

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

2004-06-15

arxiv.org/abs/astro-ph/0406350v1

Astronomy and Astrophysics

Astrophysics

6 pages, 5 figure, Accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2004.08122.x

We derived the distance to the central region of the Sagittarius dwarf spheroidal galaxy from the Red Giant Branch Tip. The obtained distance modulus is $(m-M)_0=17.10\pm0.15$, corresponding to a heliocentric distance $D=26.30\pm1.8$ Kpc. This estimate is in good agreement with the distance obtained from RR Lyrae stars of the globular cluster M~54, located in the core of the Sgr galaxy, once the most accurate estimate of the cluster metallicity and the most recent calibration of the $M_V(RRLy) vs.[Fe/H]$ relation are adopted.

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