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The magnetic field of the BY Draconis flare star EQ VirginisHigh resolution, high S/N-ratio line profiles of the BY Draconis-type flare star EQ Vir obtained with the MMT are presently subjected to a novel Zeeman analysis procedure which includes radiative transfer effects and compensation for blends. A mean field of 2500 + or - 300 G covering 80 + or 15 percent of EQ Vir is determined. This constitutes the first positive detection of a magnetic field in a BY Draconis-type flare star, confirming that magnetic fields are present on these stars. The value of 2500 G obtained for the photospheric field strength is similar to the value derived by assuming equipartition of magnetic and thermal energy densities in the photosphere and scaling from the solar network fields, suggesting that equipartition may determine the mean field strength in the nonspotted portion of the flare star photosphere.
Document ID
19860046716
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Saar, . H.
(Joint Inst. for Lab. Astrophysics Boulder, CO, United States)
Linsky, J. L.
(Joint Institute for Laboratory Astrophysics Boulder, CO, United States)
Beckers, J. M.
(Multiple Mirror Telescope Observatory Tucson, AZ, United States)
Date Acquired
August 12, 2013
Publication Date
March 15, 1986
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 302
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
86A31454
Funding Number(s)
CONTRACT_GRANT: NGL-06-003-057
Distribution Limits
Public
Copyright
Other

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