首页 | 本学科首页   官方微博 | 高级检索  
     检索      


Erratum: the 2.27 day period of WR-134 (HD 191765)
Authors:Stephan R McCandliss  Bruce Bohannan  Carmelle Robert  Anthony F J Moffat
Institution:(1) Dept. of Physics and Astronomy, The Johns Hopkins University, 21218 Baltimore, MD, Canada;(2) Kitt Peak National Observatory, 950 N. Cherry Ave, 85726-6732 Tucson, AZ, Canada;(3) Space Telescope Science Institute, 3700 San Martin Dr, 21218 Baltimore, MD, Canada;(4) Département Physique, Université de Montréal, C.P. 6128, Succ. ldquoArdquo, H3C 3J7 Montréal, Qc, Canada
Abstract:The original temporal analysis of a 12 night spectral timeseries of WR-134 has been found to be flawed and a re-analysis shows that the line profile variations are indeed periodic. When combined with a 4 night timeseries taken 45 days earlier, a period near 2.27 d is found in periodograms of the Heii lambda5412 line centroid,rms line width, and line skew variations. When the emission line residuals are ordered as a function of phase, a sinuous feature appears to ldquosnakerdquo about the line center with an amplitude of ± 500 km s–1. This is ap 20 larger than the line centroid amplitude; the calculation of which is heavily weighted by static portions of the line profile. In addition to the ldquosnake,rdquo emission residuals appear that move away from line center on unbound trajectories and are thought to result from the interaction of a periodic driver with the unstable flow of the radiation driven wind. The nature of the periodic driver is a topic for discussion.
Keywords:Line: Profiles  Stars: Variable  Stars: Wolf-Rayet
本文献已被 SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号