Deep CCD photometry of the dwarf spheroidal galaxy Leo I

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Abstract
We present B, V photometry of Leo I obtained with the Lick |$2048\times2048$| 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 |$205 \pm 25 \ {\rm {kpc}}$| for Leo I. We deduce, from the mean colour and the width of the giant branch, a value of |$[{\rm {Fe/H}}]=-1.6$| 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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