Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...19312201y&link_type=abstract
American Astronomical Society, 193rd AAS Meeting, #122.01; Bulletin of the American Astronomical Society, Vol. 31, p.664
Astronomy and Astrophysics
Astronomy
Scientific paper
CCD Hα images were used to study the properties of H II regions in irregular galaxies. The Hα emission line fluxes were measured and used to construct luminosity functions (LFs) for each galaxy. For most galaxies, the LF is well-represented by a power law. Only two of the galaxies have supergiant H II regions, which is probably a result of the small size and small total numbers of H II regions in irregular galaxies relative to spiral galaxies. Two types of LFs are observed suggesting the possibility of a break in the LF corresponding to a physical difference in H II regions ionized by single stars and H II regions ionized by clusters of stars. Diameters of H II regions were also measured and diamter distributions were constructed for each of the galaxies. The diameter distribution can be fit with an exponential and the characteristic diameter was measured for each galaxy. A weak correlations was found between the characteristic diameter and the absolute blue magnitude of the galaxy.
Hunter Deidre Ann
Youngblood Abigail J.
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