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Differential Rotation and the v sin i Parameter

Published online by Cambridge University Press:  26 May 2016

J. Zorec ,
A. Domiciano de Souza  and
Y. Frémat
J. Zorec
Affiliation:
Institut d'Astrophysique de Paris, CNRS, 98bis Boulevard Arago, F-75014 Paris, France
A. Domiciano de Souza
Affiliation:
Département d'Astrophysique de l'Université de Nice/Sophia-Antipolis, CNRS UMR 6525, France
Y. Frémat
Affiliation:
Place Jules Janssen, F-92195 Meudon Cedex, France

Abstract

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We study the effects of a differential rotation upon the determination of the v sin i parameter. The effects are studied for several values of the ratio t = kinetic energy/gravitational potential energy, which include energy ratios higher than permitted for critical rigid rotation and using an internal conservative rotation law that allows for a latitudinal differential rotation in the stellar surface. Two effects are outstanding: when differential rotation is dependent on the stellar latitude the v sin i parameter does not necessarily correspond to the equatorial rotation velocity; the line width is a double valued function of v sin i and it is dependent on t and the aspect angle i.

Type
Session 1 Observations of Rotating Stars
Information
Symposium - International Astronomical Union , Volume 215: Stellar Rotation , 2004 , pp. 21 - 22
Copyright
Copyright © Astronomical Society of the Pacific 2004