Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....110.1155l&link_type=abstract
Astronomical Journal v.110, p.1155
Astronomy and Astrophysics
Astronomy
16
Galaxies: Peculiar, Galaxies: Photometry, Galaxies: Stellar Content
Scientific paper
We present VI CCD photometry of ~1990 stars in the central 6.35' x 6.35' region of the Leo II dwarf spheroidal galaxy, the second most distant among the known satellite galaxies of the Milky Way Galaxy. The color- magnitude diagrams of Leo II show a narrow red giant branch (RGB), a small number of asymptotic giant branch stars, and a strong concentration of red stars with V ~ 22 mag which consist of red horizontal branch, red giant clump, and/or RGB stars. The tip of the RGB is found to be at I_TRGB_= 17.7+/-0.2 mag and (V - I)_TRGB_ = 1.48+/-0.07 mag. From the I magnitude of the tip of the RGB, we estimate the distance modulus of Leo II to be (m - M)_0_ = 21.66+/-0.21 mag, corresponding to a distance of 215+/-20 kpc for an adopted zero extinction. We measure the mean color of the RGB at M_I_ = -3.5 mag (~0.5 mag fainter than the tip of the RGB) to be (V - I)_-3.5_ = 1.28+/-0.06 mag with an intrinsic dispersion of {DELTA}(V - I)_-3.5_ = 0.08 mag. From these values we estimate the mean metallicity of the RGB stars to be [Fe/H]= - 1.97+/-0.13 dex with a dispersion of ~0.3 dex.
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