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On the stellar gravity and effective temperature dependence of the ratio ofterminal to escape velocities in stellar winds

Published online by Cambridge University Press:  12 April 2016

Luis Carrasco
Luis Carrasco*
Affiliation:
Landessternwarte, Heidelberg-Königstuhl and Instituto de Astronomia, UNAM, México

Extract

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Contrary to the results of some investigators, the ratio of terminal to escape velocities (V∞/Vesc) observed for the winds in early-type stars is found to be linearly correlated with log Γ - Γ being the ratio of stellar to Eddington's luminosities.

Although the determination of terminal velocities for O-type main sequence stars from edge velocity information may be somewhat questionable (Lamers, 1980). The determined values for the β and γ fitting parameters for the observed profiles by Conti and Garmany (1980) are tipically on the order of one for these stars. Hence, from the grid of profiles by Castor and Lamers (1979), we estimate that at most a 10% error is introduced by adopting the edge velocities as representative values of the terminal velocities of main sequence O-type stars.

Type
Session I - Winds from Early Type Stars: Observations
Information
International Astronomical Union Colloquium , Volume 59: Effects of Mass Loss on Stellar Evolution , 1981 , pp. 75 - 78
Copyright
Copyright © Reidel 1981

References

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