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| Paper: |
Validity of Clumping Approximations for Mass-Loss Rates
Determination |
| Volume: |
465, Four Decades of Massive Star Research - A Scientific Meeting in Honor of Anthony J. Moffat |
| Page: |
128 |
| Authors: |
Kubát, J.; Šurlan, B. |
| Abstract: |
Clumping in stellar winds of hot stars is a possible consequence of
radiative-acoustic instability appearing in solutions of
radiative-hydrodynamical equations. However, clumping is usually
included into stellar atmosphere modeling and radiative transfer
calculations in a highly approximate way via a global free parameter
called the clumping factor. Using different values of clumping factors,
many researchers succeeded to fit the observed spectra better and to
correct empirical mass-loss rates. This usually leads to a conclusion
that the stellar wind is clumped.
To understand how clumping may influence theoretical predictions of
mass-loss rates, different clumping properties have to be taken into
account.
If clumping appears already below the critical point, the mass-loss
rate is changed. |
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