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Title:
Angular momentum loss and stellar spin-down in magnetic massive stars
Authors:
ud-Doula, Asif; Owocki, Stanley P.; Townsend, Richard H. D.
Affiliation:
AA(Department of Physics, SUNY-Morrisville State College, Morrisville, NY 13408, USA e-mail: ), AB(Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, USA), AC(Department of Physics, University of Wisconsin-Madison, Madison, WI 53706, USA)
Publication:
Cosmic Magnetic Fields: From Planets, to Stars and Galaxies, Proceedings of the International Astronomical Union, IAU Symposium, Volume 259, p. 423-424
Publication Date:
04/2009
Origin:
CUP
Keywords:
MHD, Stars: winds, Stars: magnetic fields, Stars: early-type, Stars: rotation, Stars: mass loss
DOI:
10.1017/S174392130903097X
Bibliographic Code:
2009IAUS..259..423U

Abstract

We examine the angular momentum loss and associated rotational spin-down for magnetic hot stars with a line-driven stellar wind and a rotation-aligned dipole magnetic field. Our analysis here is based on our previous 2-D numerical MHD simulation study that examines the interplay among wind, field, and rotation as a function of two dimensionless parameters, W(=Vrot/Vorb) and ‘wind magnetic confinement’, η∗ defined below. We compare and contrast the 2-D, time variable angular momentum loss of this dipole model of a hot-star wind with the classical 1-D steady-state analysis by Weber and Davis (WD), who used an idealized monopole field to model the angular momentum loss in the solar wind. Despite the differences, we find that the total angular momentum loss averaged over both solid angle and time follows closely the general WD scaling ~ ṀΩR2A. The key distinction is that for a dipole field Alfvèn radius RA is significantly smaller than for the monopole field WD used in their analyses. This leads to a slower stellar spin-down for the dipole field with typical spin-down times of order 1 Myr for several known magnetic massive stars.
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