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Title:
Zeeman observations of the H-alpha region in BY Draconis
Authors:
Anderson, C. M.; Hartmann, L. W.; Bopp, B. W.
Affiliation:
AA(Ritter Observatory, Toledo, Ohio), AB(Ritter Observatory, Toledo, Ohio)
Publication:
Astrophysical Journal, vol. 204, Feb. 15, 1976, pt. 2, p. L51-L54. Research supported by the University of Wisconsin. (ApJL Homepage)
Publication Date:
02/1976
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Binary Stars, H Alpha Line, M Stars, Stellar Magnetic Fields, Stellar Spectrophotometry, Zeeman Effect, Absorption Spectra, Circular Polarization, Stellar Rotation
DOI:
10.1086/182052
Bibliographic Code:
1976ApJ...204L..51A

Abstract

Results of high-dispersion spectrographic observations of H-alpha region in the spotted flare star BY Draconis are presented. A 'Zeeman' spectrogram obtained with the starspot near the limb shows obvious differences between the H-alpha emission profile seen in the different senses of circular polarization. If this is interpreted as a longitudinal Zeeman effect, a field of 40 kilogauss is implied. The photospheric absorption-line spectrum shows no gross evidence of large magnetic fields, but the sensitivity of these is such that fields of several kilogauss can not be ruled out.

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