Empirical bounds for the ionizing fluxes of Wolf-Rayet stars.

Law, David R. and DeGioia-Eastwood, Kathleen and Moore, Kevin L. (2002) Empirical bounds for the ionizing fluxes of Wolf-Rayet stars. Astrophysical Journal, 565 (1239). pp. 1239-1250. ISSN 1538-4357

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Abstract

Hα photometry and spectroscopic data were obtained for 10 Wolf-Rayet nebula, representing a wide variety of WN spectral types. The authors use these data to constrain the ionizing flux of the exciting Wolf-Rayet star, calcg. lower bounds for the Lyman continuum flux (Q0) and for the He0- and He+- ionizing fluxes (Q1 and Q2). Q0 appears independent of WN spectral type, and lower bound ests. tend to cluster around 48 dex. Finally, the authors discuss the effects of potential shock excitation and d. bounding on these nebula and compare the authors' results to recent models. The authors' 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. [on SciFinder(R)]

Item Type:	Article
Publisher’s Statement:	© 2002 The American Astronomical Society. Published by IOP Publishing.
ID number or DOI:	10.1086/337922
Keywords:	atmospheres; classification; emission; fundamental parameters; Galaxies; h-ii region; HII regions; m1-67; ngc-6888; spatially resolved spectroscopy; stars : fundamental parameters; 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 Sep 2015 17:29
URI:	http://openknowledge.nau.edu/id/eprint/404

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