Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105.1392d&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 105, no. 4, p. 1392-1399.
Astronomy and Astrophysics
Astronomy
10
Astronomical Photometry, Asymptotic Giant Branch Stars, Dwarf Galaxies, Interstellar Extinction, Star Distribution, Stellar Luminosity, Brightness Distribution, Cepheid Variables, Distance, Magellanic Clouds, Metallicity, Star Formation, Stellar Color
Scientific paper
Deep B, V, and I CCD images are used to investigate the stellar content of a field along the major axis of the nearby dwarf galaxy NGC 3109. Stars spanning a wide range of ages are detected, and the youngest have ages between 10 and 30 million years. The total line-of-sight reddening is E(B - V) about 0.14. The distance modulus of NGC 3109 is rederived from published Cepheid photometry; the result is mu0 = 25.05. The luminosity function of upper main-sequence stars follows a well-defined power law with exponent 0.37 +/-0.01. Asymptotic giant branch (AGB) stars have also been detected. The AGB tip occurs near M(bol) about -7.0, indicating that an intermediate-age population is present. Moreover, the bolometric luminosity function of AGB stars is identical to that seen in the SMC, a galaxy with similar integrated absolute brightness. Finally, the locus of the red giant branch is very blue, indicating that the old and intermediate-age populations are extremely metal-poor.
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