TY  - JOUR
A1  - Kholtygin, A. F.
A1  - Fabrika, S. N.
A1  - Rusomarov, N.
A1  - Hamann, Wolf-Rainer
A1  - Kudryavtsev, D. O.
A1  - Oskinova, Lida
A1  - Chountonov, G. A.
T1  - Line profile variability and magnetic fields of Wolf-Rayet stars: WR 135
 and WR 136
JF  - ASTRONOMISCHE NACHRICHTEN
N2  - 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
KW  - stars: atmospheres
KW  - stars: magnetic fields
KW  - stars: winds
KW  - stars: Wolf-Rayet
KW  - techniques: polarimetric
Y1  - 2011
U6  - https://doi.org/10.1002/asna.201111595
SN  - 0004-6337
VL  - 332
IS  - 9-10
SP  - 1008
EP  - 1011
PB  - WILEY-BLACKWELL
CY  - MALDEN
ER  -