ISO SWS Spectroscopy of WR 146 (WC6+O) |
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| Authors: | AJ Willis Luc Dessart PA Crowther PW Morris KA Van Der Hucht |
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| Institution: | (1) Dept. of Physics & Astronomy, University College London, Gower Street, London, UK;(2) Villafranca del Castillo Satellite Tracking Station, Madrid, Spain;(3) SRON, Sorbonnelaan 2, Utrecht, Netherlands |
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| Abstract: | We have obtained ISO SWS spectroscopy of WR 146 (WC6+O) covering the wavelength range 2.6-20 µm. WC6 wind emission is observed in numerous lines of He II and C IV, as well as in the Ne III] 15.5 µm line, but not in Ne II] 12.81 or Ne V] 14.32 µm. An analysis of these spectra (and complementary radio and optical data) yields for the WC6 star: v∞ = 2700 km s-1; M=2.6×10-5M⊙yr-1; C/He = 0.15; and a neon abundance bound of 3.4×10-3≤Ne/He≤6.8×10-3. The neon abundance is close to that predicted in stellar evolution models of WC stars. |
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