Zeeman observations of the H-alpha region in BY Draconis

Details Zeeman observations of the H-alpha region in BY Draconis Zeeman observations of the H-alpha region in BY Draconis

Feb 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...204l..51a&link_type=abstract

Astrophysical Journal, vol. 204, Feb. 15, 1976, pt. 2, p. L51-L54. Research supported by the University of Wisconsin.

Astronomy and Astrophysics

Astrophysics

19

Binary Stars, H Alpha Line, M Stars, Stellar Magnetic Fields, Stellar Spectrophotometry, Zeeman Effect, Absorption Spectra, Circular Polarization, Stellar Rotation

Scientific paper

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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