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The Iron Curtain of WC9 Stars

Published online by Cambridge University Press:  14 August 2015

K.A. van der Hucht ,
P.S. Conti  and
A.J. Willis
K.A. van der Hucht
Affiliation:
1Space Research Laboratory, University of Utrecht
P.S. Conti
Affiliation:
2Joint Institute for Laboratory Astrophysics, Boulder
A.J. Willis
Affiliation:
3Department of Physics and Astronomy, UCL, London

Abstract

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High resolution (Δλ ≈ 0.1å) IUE spectra have been obtained of the two WC9 stars HD 164270 and HD 136488, covering the wavelength range λλ1150–2050. The former star shows P Cygni profiles indicating a stellar wind terminal velocity of v∞ ≈ −1400 km s−1, and the latter v∞ ≈ −1800 km s−1. A common feature in the spectra of both stars is narrow displaced absorptions due to Fe III (UV34) transitions arising from a metastable lower level. These features are displaced at subterminal velocities (−830 km s−1 for HD 164270 and −1030 km s−1 for Hd 136488) and are believed to be formed in the deceleration region of their stellar winds. The properties of these inferred Fe III circumstellar shells derived from these data are discussed.

Type
SESSION 4 — OBSERVATIONS OF WOLF-RAYET BINARIES
Information
Symposium - International Astronomical Union , Volume 99: Wolf-Rayet Stars: Observations, Physics, Evolution , 1982 , pp. 277 - 281
Copyright
Copyright © Reidel 1982 

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