Infrared photometry of the inner regions of the dwarf irregular galaxy NGC 3109

M. Victoria Alonso, Dante Minniti, Albert A. Zijlstra, Eline Tolstoy

Resultado de la investigación: Contribución a una revistaArtículo

5 Citas (Scopus)

Resumen

We present VIJHK photometry for stars in a 0.8×2.0 kpc2 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 logL/L vs logTef f diagram of the galaxy and compare the results with the theoretical isochrones of Bertelli et al. (1994) for Z = 0.004 and Y = 0.24. The comparison suggests that most of the stars detected in the IR are 109 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.

Idioma originalInglés
Páginas (desde-hasta)33-44
Número de páginas12
PublicaciónAstronomy and Astrophysics
Volumen346
N.º1
EstadoPublicada - 1 dic 1999

Áreas temáticas de ASJC Scopus

  • Astronomía y astrofísica
  • Ciencias planetarias y espacial

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