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Neon Abundances From A Spitzer/Irs Survey Of Wolf-Rayet Stars., R. Ignace, J. P. Cassinelli, G. Tracy, E. Churchwell, H. J. G. L. M. Lamers

Richard Ignace

We report on neon abundances derived from Spitzer high resolution spectral data of eight Wolf-Rayet (WR) stars using the forbidden line of [Ne III] 15.56 μm. Our targets include four WN stars of subtypes 4–7, and four WC stars of subtypes 4–7. We derive ion fraction abundances γ of Ne²⁺ for the winds of each star. The ion fraction abundance is a product of the ionization fraction Q_i in stage i and the abundance by number A_E of element E relative to all nuclei. Values generally consistent with solar are obtained for the WN stars, and values …