The Carina dwarf spheroidal - an intermediate age galaxy

Details The Carina dwarf spheroidal - an intermediate age galaxy The Carina dwarf spheroidal - an intermediate age galaxy

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...273..530m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 273, Oct. 15, 1983, p. 530-538.

Other

114

Astronomical Photometry, Dwarf Galaxies, Galactic Evolution, Galactic Structure, Star Distribution, Color-Magnitude Diagram, Main Sequence Stars, Mass To Light Ratios, Spheroids, Stellar Color, Stellar Evolution, Stellar Luminosity, Stellar Magnitude, Universe

Scientific paper

Carina dwarf spheroidal galaxy B and V deep frames have yielded a color-magnitude diagram which reaches V = 24 mag, and a main sequence turnoff is apparent at V = 23 mag. A well defined red horizontal branch yields a distance modulus of 19.8, and both isochrone fitting and the horizontal branch turnoff difference yield an age estimate for the bulk of the stellar population of 7.5 + or - 1.5 Gyr. A comparison of the Carina luminosity function with theoretical predictions offers no support for a Population II component in this galaxy, in keeping with other hypotheses suggesting that the fraction of 16 Gyr stars is small. This makes Carina the leading contender for a galaxy which did not form stars until the universe was old.

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