H II regions in NGC 628. III - H-alpha luminosities and the luminosity function

Details H II regions in NGC 628. III - H-alpha luminosities and the luminosity function H II regions in NGC 628. III - H-alpha luminosities and the luminosity function

Oct 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...241..573k&link_type=abstract

Astrophysical Journal, Part 1, vol. 241, Oct. 15, 1980, p. 573-586.

Astronomy and Astrophysics

Astrophysics

69

Astronomical Photometry, Galaxies, H Alpha Line, H Ii Regions, Luminosity, Hydrogen Ions, Photomapping, Star Clusters, Stellar Evolution, Tables (Data)

Scientific paper

A complete photometric mapping of NGC 628 in the light of H-alpha is used to measure the luminosities of 593 H II regions. Isophotometry of a few individual objects is used to derive the basic properties of the H II region population. Both the luminosity and the diameter functions are well represented by steep power laws. The H II region luminosity function is largely independent of radius in NGC 628 and is the same in or out of spiral arms. There exists a marked difference, however, between the populations in or out of spiral arms. The H II region function is used to derive the approximate form of the OB associated mass function.

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