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Methods and Results for Detecting Magnetic Fields on Late-Type Stars

Published online by Cambridge University Press:  04 August 2017

Mark S. Giampapa  and
Simon P. Worden
Mark S. Giampapa
Affiliation:
Harvard-Smithsonian Center for Astrophysics
Simon P. Worden
Affiliation:
United States Air Force, Headquarters, Space Division

Abstract

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We discuss our program to detect and measure magnetic flux on the surfaces of late-type stars. We adopt a novel technique to deconvolve magnetically insensitive lines from similar, magnetically sensitive lines to infer the degree of Zeeman splitting in the latter lines. These measurements yield values for the magnetic field strength and filling factor (flux). To illustrate our approach we present multiple observations of the RS CVn star λ And. At the epoch of observation 26 April 1981 we find a field strength of 1290 ± 50 gauss covering 48 ± 2 percent of this star's surface. Observations at other epochs clearly demonstrate magnetic flux variability on λ And.

Type
I. Magnetic Fields in Stellar Photospheres
Information
Symposium - International Astronomical Union , Volume 102: Solar and Stellar Magnetic Fields: Origins and Coronal Effects , 1983 , pp. 29 - 34
Copyright
Copyright © Reidel 1983 

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