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Stellar Winds and Spindown — Observations

Published online by Cambridge University Press:  04 August 2017

L. Hartmann
L. Hartmann*
Affiliation:
Harvard-Smithsonian Center for Astrophysics 60 Garden Street Cambridge, MA 02138, U.S.A.

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Stars with masses ≲ 1 M⊙ are observed to rotate more slowly as they age. The angular momentum loss is undoubtedly caused by the coupling of the stellar magnetic field to the escaping wind (Schatzman 1962). Chromospheric and coronal radiative losses depend upon rotation (Wilson 1966a, b; Kraft 1967; Skumanich 1972; Hall 1976; Bopp 1980; Walter and Bowyer 1981; Walter 1981; Vaiana et al. 1981). It is therefore likely that both magnetic fields (Skumanich 1972) and the mechanical energy fluxes required to drive mass loss also depend upon rotation as well. This complicated feedback between magnetic fields, winds, and rotation must control the variation of solar-type activity over much of the HR diagram, and may have very important effects on pre-main sequence evolution.

Type
V. Stellar Winds and Spindown in Late — Type Stars
Information
Symposium - International Astronomical Union , Volume 102: Solar and Stellar Magnetic Fields: Origins and Coronal Effects , 1983 , pp. 417 - 438
Copyright
Copyright © Reidel 1983 

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