Volume 534, October 2011
|Number of page(s)||3|
|Published online||12 October 2011|
Improved velocity law parameterization for hot star winds
Ústav teoretické fyziky a astrofyziky PřF MU, 611 37 Brno, Czech Republic
2 Astronomický ústav, Akademie věd České republiky, 251 65 Ondřejov, Czech Republic
Received: 9 February 2011
Accepted: 29 August 2011
The velocity law of hot star winds is usually parameterized via the so-called beta velocity law. Although this parameterization stems from theoretical considerations, it is not the most accurate description of the wind velocity law that follows from hydrodynamical calculations. We show that the velocity profile of our hydrodynamical wind models is described much better by polynomial approximation. This approximation provides a better fit than the beta velocity law already for the same number of free parameters.
Key words: stars: winds, outflows / stars: mass-loss / stars: early-type / hydrodynamics / stars: atmospheres
© ESO, 2011
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