Other
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aj.....90.1457h&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 90, Aug. 1985, p. 1457-1463.
Other
32
Galaxies, Infrared Photometry, Infrared Stars, Irregular Galaxies, Stellar Color, Stellar Evolution, Blue Stars, Compact Galaxies, Cool Stars, Early Stars, H Ii Regions, Interstellar Extinction, Metallicity, Red Giant Stars
Scientific paper
The authors present JHK photometry for a sample of blue irregular galaxies, including nearby giant systems and more distant luminous compact galaxies. Four giant H II regions were also observed for comparison. The H II regions exhibit a considerable range in JHK and V-K colors, which the authors attribute to variations in the massive blue and red stellar populations and in the amount of dust. The irregular galaxies, on the other hand, have rather homogeneous colors which are similar to those of spiral and elliptical galaxies. From the infrared colors alone, the authors cannot distinguish between giant stars, asymptotic giants, and supergiants as the dominant source of infrared light in irregulars. However, the uniformity of JHK colors from galaxy to galaxy as compared with individual young stellar systems suggests that young populations are not major contributors to the infrared light. The authors also do not find correlation between metallicity and infrared colors in irregular galaxies.
Gallagher John S. III
Hunter Deidre Ann
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