HII regions and OB-star Lyman continuum fluxes.
Abstract
Lyman continuum fluxes for O stars and early B stars (spectral type B0-B2) are derived from Hα and Hβ measurements of HII regions and compared with those predicted by stellar atmospheres models. This is the first extensive application of the Zanstra method to HII regions of B--stars. Diameters and electron densities of observed HII regions are estimated. A number of HII regions, surrounding O and B stars were observed using wide-field Fabry-Perot scanning interferometers. This technique allows to observe extended HII regions of relatively bright stars. Balmer--alpha measurements of HII regions of several selected early type B-stars (B0-B2) were carried out during fall-winter 1992 with University of Wisconsin large aperture Fabry-Perot spectrometer and combined with the results of observations, carried out previously primarily on O stars.
- Publication:
-
American Astronomical Society Meeting Abstracts #182
- Pub Date:
- May 1993
- Bibcode:
- 1993AAS...182.6003K