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Observations of structure in the stellar wind of HD 152408

  • Session 1 Spectroscopic Observations of Structures in Winds of OB Stars
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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 λ5876 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.

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Authors and Affiliations

  1. Department of Physics and Astronomy, University College London, Gower Street, WC1E 6BT, London, UK

    Raman K. Prinja

  2. Bartol Research Institute, University of Delaware, 19716-4793, Newark, DE, USA

    A. W. Fullerton

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  1. Raman K. Prinja
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  2. A. W. Fullerton
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Prinja, R.K., Fullerton, A.W. Observations of structure in the stellar wind of HD 152408. Astrophys Space Sci 221, 67–76 (1994). https://doi.org/10.1007/BF01091142

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  • DOI: https://doi.org/10.1007/BF01091142

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