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26 April 2024 |
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Far-UV FUSE spectroscopy of the OVI resonance doublet in Sand2 (WO) | | Paul A. Crowther
; A. W. Fullerton
; D. J. Hillier
; K. Brownsberger
; L. Dessart
; A. J. Willis
; O. De Marco
; M. J.
; Barlow
; J. B. Hutchings
; D.L. Massa
; D. C. Morton
; G. Sonneborn
; | | Date: |
3 May 2000 | | Subject: | astro-ph | | Affiliation: | UCL), A. W. Fullerton (UVic/JHU), D. J. Hillier (Pittsburgh), K. Brownsberger (U. Col), L. Dessart, A. J. Willis, O. De Marco, M. J., Barlow (UCL), J. B. Hutchings (HIA/NRC), D.L. Massa (GSFC), D. C. Morton (HIA/NRC), G. Sonneborn (GSFC | | Abstract: | We present Far-Ultraviolet Spectroscopic Explorer (FUSE) spectroscopy of Sand 2, a LMC WO-type Wolf-Rayet star, revealing the OVI resonance P Cygni doublet at 1032-38A. These data are combined with HST/FOS ultraviolet and Mt Stromlo 2.3m optical spectroscopy, and analysed using a spherical, non-LTE, line-blanketed code. Our study reveals exceptional stellar parameters: T*=150,000K, v_inf=4100 km/s, log (L/Lo)=5.3, and Mdot=10^-5 Mo/yr if we adopt a volume filling factor of 10%. Elemental abundances of C/He=0.7+-0.2 and O/He=0.15(-0.05+0.10) by number qualitatively support previous recombination line studies. We confirm that Sand 2 is more chemically enriched in carbon than LMC WC stars, and is expected to undergo a supernova explosion within the next 50,000 yr. | | Source: | arXiv, astro-ph/0005056 | | Services: | Forum | Review | PDF | Favorites | |
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