Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...274..611r&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 274, Nov. 15, 1983, p. 611-631.
Astronomy and Astrophysics
Astrophysics
55
Galactic Structure, H Ii Regions, Nebulae, Spiral Galaxies, Star Formation, Density Wave Model, H Alpha Line, Luminosity, Size Distribution, Spatial Distribution, Stochastic Processes
Scientific paper
A catalog of 296 H II regions in M83 is compiled from the Hα observations of Talbot, Jensen, and Dufour. Giant H II regions (excitation parameter U > 115 pc cm-2) differ from nongiant H II regions in both azimuthal and radial distribution in the plane of the galaxy. Using published data on H II regions, a similar result is found for M33. In each of these galaxies nongiant H II regions are less concentrated in a two-armed pattern and show a broader distribution as a function of galactocentric radius than giant H II regions. The observed radial distributions are compared with the predictions of a stochastic star formation model and a spiral density-wave model. These comparisons suggest that in M83 and M33 stochastic star formation and star formation by a spiral density wave both occur in the same galaxy. Stochastic processes are more relevant for producing massive stars in nongiant H II regions.
Kaufman Maike
Rumstay Kenneth S.
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