Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....96.1248f&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 96, Oct. 1988, p. 1248-1306.
Astronomy and Astrophysics
Astronomy
80
Blue Stars, Charge Coupled Devices, Early Stars, Late Stars, Red Giant Stars, Star Distribution, Astronomical Photometry, Carbon Stars, Color-Magnitude Diagram, Open Clusters
Scientific paper
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 supergiants, 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. The metallicity of the giant-branch stars is obtained from its (V-I) color. 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.
No associations
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