Neon abundances from a Spitzer/IRS survey of Wolf-Rayet stars

被引：10

作者：

Ignace, R. ^{[1
]}

Cassinelli, J. P.

Tracy, G.

Churchwell, E.

机构：

[1] E Tennessee State Univ, Dept Phys Astron & Geol, Johnson City, TN 37614 USA

[2] Univ Wisconsin, Dept Astron, Madison, WI 53706 USA

[3] Univ Utrecht, Astron Inst, NL-3584 CC Utrecht, Netherlands

来源：

ASTROPHYSICAL JOURNAL | 2007年 / 669卷 / 01期

关键词：

stars : abundances; stars : mass loss; stars : winds; outflows; stars : Wolf-Rayet;

D O I：

10.1086/521718

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 mu m. Our targets include four WN stars of subtypes 4-7, and four WC stars of subtypes 4-7. We derive ion fraction abundances gamma 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 in excess of solar are obtained for the WC stars.

引用

页码：600 / 605

页数：6

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