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Fossil Magnetospheres Confront Newborn Dynamos in the Rapid Braking Zone

Published online by Cambridge University Press:  26 May 2016

Thomas R. Ayres
Thomas R. Ayres*
Affiliation:
Center for Astrophysics & Space Astronomy, University of Colorado, Boulder, CO, USA, 80309-0389

Abstract

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Fast spinning Hertzsprung gap giants display super-rotational broadening of UV “hot” lines like Fe XXI λ1354 and C IV λ1548, with FWHM's up to twice that expected from the photospheric v sin i. This possibly is the result of extended fossil magnetospheres enveloping the gap giants, a new type of stellar corona. The magnetospheric phase is short-lived, however, as the rapidly evolving giants develop a competing dynamo-generated surface field in the so-called Rapid Braking Zone.

Type
Session 2 Rotation in Relation with Abundances and Magnetic Fields
Information
Symposium - International Astronomical Union , Volume 215: Stellar Rotation , 2004 , pp. 280 - 286
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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