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On the circumstellar environment of SS433

Clark, J. S.; Barnes, A. D. and Charles, P. A. (2007). On the circumstellar environment of SS433. Monthly Notices of the Royal Astronomical Society, 380(1) pp. 263–269.

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We present new 8200-8900 Å high-resolution spectroscopic observations of the unusual accreting source SS433. The spectra are highly variable on a night-to-night basis, and are dominated by emission from the Paschen series and O iemission. Differences in line profiles between the two species suggest that they arise in kinematically distinct and highly variable circumstellar regions. Moreover, the strength of O iemission argues against identifying the mass donor as a Wolf-Rayet star since we might expect oxygen to be depleted by the CNO cycle in such a star. Weak N iabsorption lines are present, which, if arising in the photosphere of the mass donor would imply a spectral type of B5 or later. However, no evidence was found for orbital modulation in their radial velocity curves suggesting that they too arise in the accretion-driven outflow. Finally, by analogy to the massive close binary RY Scuti, we suggest that the recent detection of a mid-infrared excess attributed to warm dust may arise in a circumbinary disc, implying that SS433 hosts a rich, highly structured circumstellar environment driven by the high mass-transfer rate from the mass donor.

Item Type: Journal Article
ISSN: 1365-2966
Keywords: binaries: close; stars: individual: SS433; stars: individual: V1343 Aquilae; X-rays: binaries
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 12371
Depositing User: Astrid Peterkin
Date Deposited: 26 Nov 2008 12:16
Last Modified: 11 Jul 2013 15:25
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