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Empirical bounds for the ionizing gluxes of Wolf-Rayet stars

Law, David R. and DeGioia-Eastwood, Kathleen and Moore, Kevin L. (2002) Empirical bounds for the ionizing gluxes of Wolf-Rayet stars. The Astrophysical Journal, 565 (2). pp. 1239-1250. ISSN 0004-637X


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Publisher’s or external URL: http://adsabs.harvard.edu/abs/2002ApJ...565.1239L


Hα photometry and spectroscopic data have been obtained for 10 Wolf-Rayet nebulae, representing a wide variety of WN spectral types. We use these data to constrain the ionizing flux of the exciting Wolf-Rayet star, calculating lower bounds for the Lyman continuum flux (Q0) and for the He0- and He+-ionizing fluxes (Q1 and Q2). We find that Q0 appears independent of WN spectral type, and lower bound estimates tend to cluster around 48 dex. Finally, we discuss the effects of potential shock excitation and density bounding on these nebulae and compare our results to recent models. Our results are consistent with the predictions of line-blanketed ISA-wind models and nonblanketed CMFGEN models but are consistent with only some of the line-blanketed CMFGEN models.

Item Type: Article
Publisher’s Statement: Copyright 2002. The American Astronomical Society
ID number or DOI: 10.1086/337922
Keywords: atmospheres; classification; emission; fundamental parameters; Galaxies; h-ii region; HII regions; ISM: H II Regions; m1-67; ngc-6888; spatially resolved spectroscopy; stars : fundamental parameters; stars: fundamental parameters; stars : Wolf-Rayet; Stars: Wolf-Rayet; wr ring nebulae
Subjects: Q Science > QB Astronomy
NAU Depositing Author Academic Status: Faculty/Staff
Department/Unit: College of Engineering, Forestry, and Natural Science > Physics and Astronomy
Date Deposited: 30 Mar 2016 16:52
URI: http://openknowledge.nau.edu/id/eprint/1337

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