| Abstract | BVRI photometry of over 2000 stars in two fields in IC 1613 has been obtained from CCD frames taken at the prime focus of the Canada-France-Hawaii telescope. The disk of IC 1613 is seen to contain stars with a range of ages: (1) young stars indicated by a distinctive plume of luminous blue stars, yellow super- giants, Cepheids, and a smaller number of red supergiant candidates at comparable luminosities, (2) intermediate-age stars, typified by very red extended asymptotic-giant-branch stars and carbon stars, and, finally (3) a population consistent with that of an old, red giant population, the bright tip of which is found to resolve at V~21.8 mag. The I photometry of resolved stars defining the tip of this red giant branch yields a distance-modulus estimate for IC 1613 of 24.2 +/- 0.2 mag, in good agreement with previous estimates of this modulus. The metallicity of the giant-branch stars is obtained from its (V-I) color, and this population component is found to be metal poor with [Fe/H] ~ -1.3 dex and a dispersion of about +/- 0.8 dex. A visual inspection of good-seeing CCD frames and plates indicates that the number of clusters in IC 1613 is very low, confirming Baade's original suggestion. Finally, color-magnitude diagrams of ten of the Hodge associations in the two CCD fields are presented. |
