Bibcode
DOI
Knapen, J. H.; Arnth-Jensen, Nina; Cepa, Jordi; Beckman, J. E.
Bibliographical reference
Astronomical Journal (ISSN 0004-6256), vol. 106, no. 1, p. 56-65.
Advertised on:
7
1993
Citations
37
Refereed citations
34
Description
We present a new H-alpha image of high quality of the grand-design
galaxy NGC 6814, and describe statistical properties of the H II region
population. We have determined positions, angular sizes, and calibrated
fluxes of 735 individual H II regions. We construct luminosity functions
(LFs) for the complete sample, separately for arm and interarm regions,
and for H II regions within and outside the limiting radius
corresponding to the bright optical disk. The slope of the LF for the
complete sample agrees well with values published for other Sbc and Sc
galaxies. LFs for H II regions in the arms, in the interarm regions, in
the inner part, and in the outer part of the galaxy all have the same
slopes. We show and discuss the diameter distribution of the H II
regions, both for the complete sample and for the separate arm,
interarm, inner, and outer disk samples. There is no evidence for a
different population of H II regions in the spiral arms, nor is there
evidence for the existence of a significant population of
density-bounded H II regions. We discuss implications for massive star
forming processes in this galaxy, and discuss possible differences from
other grand-design spirals.