DIRECT SPECTROSCOPIC OBSERVATIONS OF CLUMPING IN O-STAR WINDS
نویسندگان
چکیده
منابع مشابه
Direct Spectroscopic Observations of Clumping in O - Star Winds
We report the detection and monitoring of transient substructures in the radiation-driven winds of five massive, hot stars in different evolutionary stages. Clumping in the winds of these stars shows up as variable, narrow subpeaks superposed on their wide, wind-broadened (optical) emission lines. Similar patterns of emission-line profile variations are detected in the Of stars ζ Puppis and HD9...
متن کاملModelling the clumping-induced polarimetric variability of hot star winds
Context. Clumping in the winds of massive stars may significantly reduce empirical mass-loss rates, and which in turn may have a large impact on our understanding of massive star evolution. Aims. Here, we investigate wind-clumping through the linear polarization induced by light scattering off the clumps. Methods. Through the use of an analytic wind clumping model, we predict the time evolution...
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Recent studies of massive O-type stars present clear evidences of inhomogeneous and clumped winds. O-type (H-rich) central stars of planetary nebulae (CSPNs) are in some ways the low mass–low luminosity analogous of those massive stars. In this contribution, we present preliminary results of our on-going multi-wavelength (FUV, UV and optical) study of the winds of Galactic CSPNs. Particular emp...
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We study the influence of clumping on the predicted wind structure of O-type stars. For this purpose we artificially include clumping into our stationary wind models. When the clumps are assumed to be optically thin, the radiative line force increases compared to corresponding unclumped models, with a similar effect on either the mass-loss rate or the terminal velocity (depending on the onset o...
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New constraints on the large-scale wind structures responsible for discrete absorption components are obtained from far-ultraviolet time-series observations of O supergiants in the Large Magellanic Cloud. 1. What Causes DACs? Discrete absorption components (DACs) are optical depth enhancements in the absorption troughs of P Cygni profiles, which (a) occur very commonly in wind profiles of OB-ty...
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ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 2008
ISSN: 0004-6256,1538-3881
DOI: 10.1088/0004-6256/136/2/548