Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...346...33a&link_type=abstract
Astronomy and Astrophysics, v.346, p.33-44 (1999)
Astronomy and Astrophysics
Astrophysics
5
Stars: Hertzsprung-Russel (Hr) And C-M Diagrams, Galaxies: Abundances, Galaxies: Evolution, Galaxies: Individual: Ngc 3109, Galaxies: Irregular, Infrared: Galaxies
Scientific paper
We present VIJHK photometry for stars in a 0.8x2.0 kpc(2) inner field of the dwarf irregular galaxy NGC 3109. The infrared photometry reaches 3 magnitudes fainter than previous work. Optical and infrared color-color and color-magnitude diagrams, and a bolometric luminosity function are constructed, confirming the presence of an intermediate-age stellar population. We also present a log{L/Lsun} vs log{Teff} diagram of the galaxy and compare the results with the theoretical isochrones of Bertelli et al. ( te{bertelli}) for Z=0.004 and Y=0.24. The comparison suggests that most of the stars detected in the IR are 10(9) yr or younger. We compare the infrared color-magnitude diagrams of NGC 3109 with the composite color-magnitude diagrams of LMC clusters and of the outer disk of the Scd galaxy M33. They show similar stellar content in these late-type systems. Based on observations collected at La Silla Observatory
Alonso Maria Victoria
Tolstoy Eline
Zijlstra Albert A.
~Minniti Dante
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