Modeling of G333.6-0.2 as a spherical H II region

Details Modeling of G333.6-0.2 as a spherical H II region Modeling of G333.6-0.2 as a spherical H II region

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...265..239r&link_type=abstract

Astrophysical Journal, Part 1, vol. 265, Feb. 1, 1983, p. 239-248.

Astronomy and Astrophysics

Astronomy

21

Abundance, Astronomical Models, Density Distribution, H Ii Regions, Nebulae, Galactic Structure, Infrared Spectra, Ionized Gases, Photoionization, Radial Distribution, Radio Sources (Astronomy), Stellar Models, Stellar Radiation

Scientific paper

The radio and IR observations of the H II region G333.6-0.2 are matched with a detailed spherical model with a density distribution which has a uniform-density core of radius 0.05 pc, a power-law intermediate zone, and a uniform-density halo. A stellar radiation field is required that is somewhat different from those predicted by available model atmospheres. Of the stellar models of Kurucz, the Teff = 34,000 K and log g = 3.5 model best fits the observed ratio of helium to hydrogen recombination lines. A good fit to all the observations in obtained with an S(2+) ionizing flux which is a factor of 20 times less than predicted by the Kurucz atmosphere. Current model atmospheres may not be appropriate because a single stable star with Teff = 34,000 K fails by at least an order of magnitude to produce the ionizing luminosity. The small radius of the constant-density core implies a short dynamical lifetime of approximately 5000 years for this spherical model; this may indicate that a nonspherical blister geometry is more appropriate for this H II region.

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