Observations of structure in the stellar wind of HD 152408 |
| |
| Authors: | Raman K Prinja A W Fullerton |
| |
| Institution: | (1) Department of Physics and Astronomy, University College London, Gower Street, WC1E 6BT London, UK;(2) Bartol Research Institute, University of Delaware, 19716-4793 Newark, DE, USA |
| |
| Abstract: | We report on the presence of substantial, low-velocity stellar wind structure in the extreme O supergiant HD 152408, based on optical spectroscopic time-series observations. Systematic variations in the form of migrating optical depth enhancements occur in the absorption trough of the He I  5876 P Cygni profile. These variations start deep in the stellar wind, slowly accelerate bluewards to  0.5v over  1–2 days, and recur at intervals of about 1 day. Sympathetic variations are apparent in the Balmer emission lines. The observations provide constraints on the stability of the low-velocity stellar wind regime, and indicate the presence of large-amplitude perturbations at great depths in the outflow. |
| |
| Keywords: | stars: mass-loss stars: early-type stars: individual: HD 152408 |
| 本文献已被 SpringerLink 等数据库收录！ |
|
