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Line profile variability and magnetic fields of Wolf-Rayet stars: WR 135 and WR 136

  • We have obtained spectropolarimetric observations of two Wolf-Rayet stars, WR 135 (WC8) and WR 136 (WN6), with the 6-m Russian telescope in July 2009 and July 2010. We have studied the He II 5412 angstrom line region, which contains also the C IV 5469 angstrom line (for WR 135 only). Our goals were to investigate the rapid line-profile variability (LPV) in WR star spectra and to search for magnetic fields. We find small amplitude emission peaks moving from the center of He II line to its wings during the night in spectra of both stars. These emission peaks are likely a signature of accelerating clumps in the stellar wind. We obtained upper limits of the magnetic field strength: approximate to 200G for WR 135 and approximate to 50G for WR 136. (C) 2011 WILEY-VCH Verlag GmbH&Co. KGaA, Weinheim

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Metadaten
Author:A. F. Kholtygin, S. N. Fabrika, N. Rusomarov, Wolf-Rainer HamannORCiDGND, D. O. Kudryavtsev, L. M. Oskinova, G. A. Chountonov
DOI:https://doi.org/10.1002/asna.201111595
ISSN:0004-6337 (print)
Parent Title (English):ASTRONOMISCHE NACHRICHTEN
Publisher:WILEY-BLACKWELL
Place of publication:MALDEN
Document Type:Article
Language:English
Year of first Publication:2011
Year of Completion:2011
Release Date:2017/03/26
Tag:stars: Wolf-Rayet; stars: atmospheres; stars: magnetic fields; stars: winds; techniques: polarimetric
Volume:332
Issue:9-10
Pagenumber:4
First Page:1008
Last Page:1011
Funder:Saint-Petersburg University [6.38.73.2011]; Scientific Leading Schools [N 5473.2010.2]