AAS 199th meeting, Washington, DC, January 2002
Session 135. Circumstellar Material and Atmospheres: Hotter
Display, Thursday, January 10, 2002, 9:20am-4:00pm, Exhibit Hall

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[135.08] Empirical Bounds for the Ionizing Fluxes of Wolf-Rayet Stars.

D.R. Law (University of Virginia), K. DeGioia-Eastwood (Northern Arizona University), K.L. Moore (University of California- Berkeley)

H\alpha photometry and spectroscopic data have been obtained for ten 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.

We present these data and compare our results to recent models. Our results are consistent with the predictions of line-blanketed ISA-wind models and non-blanketed CMFGEN models, but are consistent with only some of the line-blanketed CMFGEN models.

DRL would like to acknowledge the support of the NSF grant funding the REU program at NAU.

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