Deep CCD Photometry of the Dwarf Spheroidal Galaxy Leo-I

Details Deep CCD Photometry of the Dwarf Spheroidal Galaxy Leo-I Deep CCD Photometry of the Dwarf Spheroidal Galaxy Leo-I

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.266....7d&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 266, NO. 1/JAN, P. 7, 1994

Astronomy and Astrophysics

Astronomy

25

Scientific paper

We present B, V photometry of Leo I obtained with the Lick 2048 X 2048 CCD installed at the prime focus of the CFHT. The colour-magnitude diagram to V = 22.2 shows a wide giant branch and a red clump indicative of the presence of an intermediate-age population. Our observations do not detect any `blue' horizontal branch. The apparent magnitudes of the red clump and of the carbon stars lead to a distance estimate of 205 +/- 25 kpc for Leo I. We deduce, from the mean colour and the width of the giant branch, a value of [Fe/H] = - 1.6 and an upper limit in abundance dispersion of 0.25 dex. V magnitudes and B - V colours of the known carbon stars are given, and two additional carbon star candidates are identified. The Hodge & Wright variables are located, and a short list of magnitudes and colours is presented.

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