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WR146 - observing the OB-type companion | | Sean M. Dougherty
; P.M. Williams
; D.L. Pollacco
; | | Date: |
3 Mar 2000 | | Journal: | Mon.Not.Roy.Astron.Soc. 316 (2000) 143 | | Subject: | astro-ph | | Affiliation: | 1 and 2), P.M. Williams and D.L. Pollacco (Dept of Physics and Astronomy, University of Calgary, DRAO, Herzberg Institue for Astrophysics, National Research Council of Canada, Institute for Astronomy, University of Edinburgh, Queens University Belf | | Abstract: | We present new radio and optical observations of the colliding-wind system WR146 aimed at understanding the nature of the companion to the Wolf-Rayet star and the collision of their winds. The radio observations reveal emission from three components: the WR stellar wind, the non-thermal wind-wind interaction region and, for the first time, the stellar wind of the OB companion. This provides the unique possibility of determining the mass-loss rate and terminal wind velocity ratios of the two winds, independent of distance. Respectively, these ratios are determined to be 0.20+/-0.06 and 0.56+/-0.17 for the OB-companion star relative to the WR star. A new optical spectrum indicates that the system is more luminous than had been believed previously. We deduce that the ``companion’’ cannot be a single, low luminosity O8 star as previously suggested, but is either a high luminosity O8 star, or possibly an O8+WC binary system. | | Source: | arXiv, astro-ph/0003048 | | Services: | Forum | Review | PDF | Favorites | |
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