Properties of H II region populations in galaxies. I - The first-ranked H II regions

Details Properties of H II region populations in galaxies. I - The first-ranked H II regions Properties of H II region populations in galaxies. I - The first-ranked H II regions

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...334..144k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 334, Nov. 1, 1988, p. 144-158.

Astronomy and Astrophysics

Astrophysics

150

Astronomical Photometry, Galactic Structure, H Ii Regions, Irregular Galaxies, Astronomical Models, H Alpha Line, Spiral Galaxies

Scientific paper

Hα photometry of the brightest H II regions in 95 nearby spiral and irregular galaxies has been used to investigate the dependence of the H II region populations on the properties of their parent galaxies. The first-ranked H II regions span a range of four orders of magnitude in luminosity, and their properties are correlated with luminosities and Hubble types of their parent galaxies. The brightest H II regions in Magellanic irregular galaxies are approximately 50 times brighter than those in early-type spirals of the same absolute magnitude. Similar trends are observed in the diameters of the brightest H II regions and in the magnitudes of the first-ranked stellar associations.

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