Testing OB-Star Atmosphere Models Using Single-Star HII Regions

Details Testing OB-Star Atmosphere Models Using Single-Star HII Regions Testing OB-Star Atmosphere Models Using Single-Star HII Regions

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21533207z&link_type=abstract

American Astronomical Society, AAS Meeting #215, #332.07; Bulletin of the American Astronomical Society, Vol. 42, p.431

Astronomy and Astrophysics

Astronomy

Scientific paper

HII region emission-line diagnostics are essential for quantifying stellar populations, probing the interstellar medium, and measuring abundances in galaxies. Single-star HII regions offer ideal systems to test the stellar atmosphere models upon which HII region spectral analyses critically depend. We use spatially resolved longslit observations of LMC single-star HII regions to evaluate predictions from widely-used stellar atmosphere models. We have a sample 12 ionizing stars with spectral types ranging from O6.5V to B0V with one B0.5Ib and one B1.5Ib. For each star, stellar atmosphere models from the CoStar, TLUSTY and WM-basic grids are used as the ionizing source in the photoionization code CLOUDY. In addition to testing the stellar atmosphere models, we critically examine optical emission-line diagnostic ratios.

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