Variable and Non-spherical Stellar Winds in Luminous Hot Stars: Proceedings of the IAU Colloquium No. 169 Held in Heidelberg, Germany, 15–19 June 1998

Alex W. Fullerton (auth.), Bernhard Wolf, Otmar Stahl, Alex W. Fullerton (eds.)3540657029, 9783540657026

There is abundant evidence that essentially all luminous hot-star winds contain time-dependent and anisotropic structures. IAU Colloquium 169 was convened to review the observations of variability and asphericity, to discuss the physical processes that might cause such behavior and to look for evolutionary consequences. The topics included OBA stars, Be stars, Wolf-Rayet stars, Be stars, and luminous blue variables (LBVs). The role played by rotation in shaping the stellar wind was a recurrent theme. Photospheric pulsations and/or magnetic fields are particularly appealing mechanisms for triggering the formation of recurrent wind structures.

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Table of contents :
Rotationally modulated winds of O stars….Pages 2-10
Rotationally modulated winds of BA-type supergiants….Pages 11-18
Using spectropolarimetry to determine envelope geometry and test variability models for hot star circumstellar envelopes….Pages 19-23
Disks of classical be stars….Pages 24-31
Evidence for azimuthal asymmetry in be star winds….Pages 32-35
Short and medium term variability of emission lines in selected southern Be stars….Pages 36-39
Disk winds of B[e] supergiants….Pages 40-48
Polarimetric evidence of non-spherical winds….Pages 49-56
Wolf-rayet wind models: Photometric and polarimetric variability….Pages 57-61
Anisotropic outflows from LBVs and Ofpe/WN9 stars….Pages 62-70
Non-isotropic outflows in the infrared: ISO imaging of LBVs….Pages 71-79
Radio evidence for non-isotropic outflows from hot stars….Pages 80-86
Optical interferometry of non-spherical winds….Pages 87-94
Direct observational evidence for magnetic fields in hot stars….Pages 95-102
HST WFPCII observations of the inner HR car nebula….Pages 103-106
Observing hot stars in all four stokes parameters….Pages 107-110
Inverse spectropolarimetric modelling of hot star wind structure and variability….Pages 111-114
Physics of radiatively driven winds by high angular resolution observations (HARO)….Pages 115-118
Wind-compressed disks….Pages 120-130
Non-spherical radiation-driven wind models….Pages 131-139
Radiation-driven disk winds….Pages 140-143
Radiative fluxes and forces in non-spherical winds….Pages 144-150
Line-driven ablation by external irradiation….Pages 151-154
Extremely luminous atmospheres….Pages 155-158
Disks formed by rotation induced bi-stability….Pages 159-168
The effects of magnetic fields on the winds from luminous hot stars….Pages 169-177
Modeling oblique rotators: Magnetospheres and winds….Pages 178-186
X-ray emission from magnetically confined winds….Pages 187-190
O-star wind variability in the ultraviolet and optical range….Pages 192-200
X-ray evidence for wind instabilities….Pages 201-202
X-ray variability of the O star ζ Puppis….Pages 203-205
On the variable winds of BA supergiants….Pages 206-213
UV wind variability in B supergiants and its implications for wind structures….Pages 214-217
Variability and evidence of non-spherical stellar winds in A-type supergiants….Pages 218-221
Variable winds in early-B hypergiants….Pages 222-229
Wind variations of wolf-rayet stars….Pages 230-238
Spectral analyses of wolf-rayet stars: The impact of clumping….Pages 239-242
The long-term variability of luminous blue variables….Pages 243-248
Blitz model for the eruptions of eta carinae….Pages 249-250
Short-term variations of LBV’s….Pages 251-254
Imaging polarimetry of eta carinae with the hubble space telescope….Pages 255-259
Non-spherical outflows in massive binary systems: Circumbinary disks?….Pages 260-267
Long-term behaviour of the variable wind of P Cygni….Pages 268-271
High-resolution spectroscopy of stellar winds in recently recognized LBV candidates….Pages 272-274
Evidence for wind anisotropies from dust formation by wolf-rayet stars….Pages 275-278
ISO-SWS spectroscopy of B[e] stars….Pages 279-282
The line-driven instability….Pages 284-293
Co-rotating interaction regions in 2D hot-star wind models with line-driven instability….Pages 294-302
Pulsations in O stars….Pages 304-311
Non-radial pulsations of BA supergiants and Be stars….Pages 312-319
Theory of pulsational instabilities of hot stars….Pages 320-328
Non-radially pulsating hot stars: Non-radial pulsations and Be phenomenon….Pages 329-336
Pulsation hydrodynamics of luminous blue variables and pulsation-driven winds….Pages 337-344
Linear strange modes in massive stars….Pages 345-352
Instabilities in LBVs and WR stars….Pages 353-356
The evolution of non-spherical and non-stationary winds of massive stars….Pages 358-367
Rotation and anisotropic losses of mass and angular momentum….Pages 368-376
Rotation and wolf-rayet star formation….Pages 377-380
Dusty LBV nebulae: Tracing the mass loss history of the most massive stars….Pages 381-390
Wolf-rayet and LBV nebulae as the result of variable and non-spherical stellar winds….Pages 391-399
Ring nebulae abundances: Probes of the evolutionary history of luminous blue variable stars….Pages 400-404
The wind momentum — Luminosity relationship of blue supergiants….Pages 405-415
Conference summary: The demise of spherical and stationary winds….Pages 416-422