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| Paper: |
Diagnosing Small- and Large-Scale Structure in the Winds of
Hot, Massive OB-Stars |
| Volume: |
464, Circumstellar Dynamics at High Resolution |
| Page: |
301 |
| Authors: |
Sundqvist, J. O.; Owocki, S. P. |
| Abstract: |
It is observationally as well as theoretically well established that the winds
of hot, massive OB-stars are highly structured on a broad range of spatial
scales. This paper first discusses consequences of the small-scale
structures associated with the strong instability inherent to the line-driving
of these winds. We demonstrate the importance of a proper treatment of such
wind clumping to obtain reliable estimates of mass-loss rates, and also show
that instability simulations that are perturbed at the lower boundary indeed
display significant clumping quite close to the wind base, in general
agreement with observations.
But a growing subset of massive stars has also been found to possess
strong surface magnetic fields, which may channel the star's outflow
and induce also large-scale wind structures and cyclic
behavior of spectral diagnostics. The paper concludes by showing that
multi-dimensional, magneto-hydrodynamical wind simulations, together
with detailed radiative-transfer modeling, can reproduce remarkably
well the periodic Balmer line emission observed in slowly rotating
magnetic O stars like HD 191612. |
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