Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.281a.339s&link_type=abstract
In ESA, A Decade of UV Astronomy with the IUE Satellite, Volume 1 p 339-342 (SEE N89-10682 01-89)
Astronomy and Astrophysics
Astronomy
5
B Stars, Corotation, Helium, Iue, Magnetospheres, Spaceborne Astronomy, Stellar Rotation, Ultraviolet Astronomy, Ultraviolet Spectra, Stellar Composition, Stellar Magnetic Fields
Scientific paper
The discovery, using combined IUE spectroscopy and Zeeman polarimetric magnetic field measurements, of a magnetosphere in a helium weak star is reported. The star, HD 5737 = alpha Scl, is one of the extreme He weak stars in its He deficiency, but is otherwise quite similar to the other sn stars HD 21699 and HD 79158. A period for the magnetic and C IV and Si IV variations of 21.65 days, a factor of 10 longer than the other variable sn stars is indicated. The effective (longitudinal) field nulls correspond extremely well to C IV line strength maxima. The magnetic field and equatorial magnetosphere are highly oblique (70 deg) and the line variations appear to be stable.
Brown David N.
Shore Steve N.
Sonneborn George
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