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OBSERVATIONS OF STRUCTURE OF THE STELLAR WIND OF HD-152408

PRINJA, RK; FULLERTON, AW; (1994) OBSERVATIONS OF STRUCTURE OF THE STELLAR WIND OF HD-152408. In: ASTROPHYSICS AND SPACE SCIENCE. (pp. 67 - 76). KLUWER ACADEMIC PUBL

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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 lambda 5876 P Cygni profile. These variations start deep in the stellar wind, slowly accelerate bluewards to greater than or equal to 0.5 v(infinity) over similar to 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.

Type:Proceedings paper
Title:OBSERVATIONS OF STRUCTURE OF THE STELLAR WIND OF HD-152408
Event:International Workshop on Instability and Variability of Hot-Star Winds
Location:ISLE AUX COUDRES, CANADA
Dates:1993-08-23 - 1993-08-27
Keywords:STARS, MASS-LOSS, STARS, EARLY-TYPE, STARS, INDIVIDUAL, HD 152408
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Physics and Astronomy

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