Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...302..777s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 302, March 15, 1986, p. 777-784.
Astronomy and Astrophysics
Astrophysics
47
Flare Stars, Late Stars, Magnetic Stars, Stellar Magnetic Fields, Dynamo Theory, Field Strength, Magnetic Flux, Photosphere, Radiative Transfer, Signal To Noise Ratios, Stellar Rotation
Scientific paper
High 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.
Beckers Jacques M.
Linsky Jeffrey L.
Saar Steven H.
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