Near-infrared photometry and stellar populations in dwarf elliptical and irregular galaxies

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astronomical Photometry, Dwarf Galaxies, Elliptical Galaxies, Irregular Galaxies, Near Infrared Radiation, Star Distribution, Abundance, Color-Color Diagram, Compact Galaxies, Dwarf Stars, Stellar Evolution, Tables (Data), Virgo Galactic Cluster

Scientific paper

Studies of three different types of dwarf galaxies have been conducted, taking into account low surface brightness (LSB) dwarf irregular (dI) galaxies, dwarf elliptical (dE) galaxies, and blue compact dwarf galaxies (BCDGs). Near-infrared observations for a large sample of BCDGs have been reported by Thuan (1983). The present paper is concerned with complementary near-infrared observations for a large sample of LSB dI and dE galaxies, and, in addition, with a few additional BCDG observations. In a discussion of dwarf elliptical galaxies, attention is given to an infrared color-color diagram, optical-infrared colors and burst ages, and the UVK color plane. Low surface brightness dwarf irregular galaxies and blue compact dwarf galaxies are considered along with the possible evolutionary scenarios which may link LSB dIs, BCDGs, and dEs.

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