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Mapping WR140 from infrared spectroscopy and imaging | P. M. Williams
; W. P. Varricatt
; A. P. Marston
; N. M. Ashok
; | Date: |
16 Nov 2004 | Subject: | astro-ph | Affiliation: | Institute for Astronomy, University of Edinburgh, Joint Astronomy Centre, Hilo, European Space Research and Technology Center, Noordwijk and Physical Research Laboratory, Navrangpura | Abstract: | Observations of the 1.083-micron He I line in WR140 (HD 193793) show P-Cygni profiles which varied as the binary system went through periastron passage. A sub-peak appeared on the normally flat-topped emission component and then moved across the profile consistent with its formation in the wind-collision region. Variation of the absorption component provided constraints on the opening angle (theta) of the wind-collision region. Infrared (2-10 micron) images observed with a variety of instruments in 2001-04 resolve the dust cloud formed in 2001, and show it to be expanding at a constant rate. Owing to the high eccentricity of the binary orbit, the dust is spread around the orbital plane in a ’splash’ and we compare the dust images with the orientation of the orbit. | Source: | arXiv, astro-ph/0411440 | Services: | Forum | Review | PDF | Favorites |
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