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New constraints on the origin of the short-term cyclical variability of the wolf-rayet star WR 46

Hénault-Brunet, V, St-Louis, N, Marchenko, SV, Pollock, AMT, Carpano, S and Talavera, A (2011) New constraints on the origin of the short-term cyclical variability of the wolf-rayet star WR 46 Astrophysical Journal, 735 (1).

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Abstract

The Wolf-Rayet star WR 46 is known to exhibit a very complex variability pattern on relatively short timescales of a few hours. Periodic but intermittent radial velocity shifts of optical lines as well as multiple photometric periods have been found in the past. Non-radial pulsations, rapid rotational modulation, or the presence of a putative low-mass companion have been proposed to explain the short-term behavior. In an effort to unveil its true nature, we observed WR 46 with the Far Ultraviolet Spectroscopic Explorer (FUSE) over several short-term variability cycles. We found significant variations on a timescale of 8hr in the far-ultraviolet (FUV) continuum, in the blue edge of the absorption trough of the OVI λλ1032, 1038 doublet P Cygni profile and in the SVI λλ933, 944 P Cygni absorption profile. We complemented these observations with X-ray and UV light curves and an X-ray spectrum from archival X-ray Multi-Mirror Mission-Newton Space Telescope (XMM-Newton) data. The X-ray and UV light curves show variations on a timescale similar to the variability found in the FUV. We discuss our results in the context of the different scenarios suggested to explain the short-term variability of this object and reiterate that non-radial pulsations is the scenario most likely to occur. © 2011. The American Astronomical Society. All rights reserved..

Item Type: Article
Authors :
NameEmailORCID
Hénault-Brunet, VUNSPECIFIEDUNSPECIFIED
St-Louis, NUNSPECIFIEDUNSPECIFIED
Marchenko, SVUNSPECIFIEDUNSPECIFIED
Pollock, AMTUNSPECIFIEDUNSPECIFIED
Carpano, SUNSPECIFIEDUNSPECIFIED
Talavera, AUNSPECIFIEDUNSPECIFIED
Date : 1 July 2011
Identification Number : 10.1088/0004-637X/735/1/13
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 12:54
Last Modified : 17 May 2017 12:54
URI: http://epubs.surrey.ac.uk/id/eprint/837177

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