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

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

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)33-44
Number of pages12
JournalAstronomy and Astrophysics
Volume346
Issue number1
Publication statusPublished - 1 Dec 1999

Keywords

  • Galaxies: Abundances
  • Galaxies: Evolution
  • Galaxies: Individual: NGC 3109
  • Galaxies: Irregular
  • Infrared: Galaxies
  • Stars: Hertzsprung-Russel (HR) and C-M diagrams

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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