Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978mnras.183..595r&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 183, June 1978, p. 595-603.
Astronomy and Astrophysics
Astronomy
20
Cepheid Variables, Circular Polarization, Stellar Magnetic Fields, Stellar Spectrophotometry, Balmer Series, Spectrum Analysis, Stellar Rotation, Zeeman Effect
Scientific paper
Nine Beta Cephei variables have been observed for the presence of magnetic fields by measuring the circular polarization in the wings of the Balmer lines. Of the 80 nightly measurements on the nine stars, only one, on Beta Cep itself, exceeded the 3-sigma level of significance. (The 1-sigma levels were generally between 500 and 1000 G, though a fourth of the measurements had errors less than 500 G.) However, a chi-squared analysis indicated the likely presence of fields in Beta Cep and Gamma Peg. A general chi-squared analysis of all 80 measurements suggests the possible existence of fields in the class of stars as a whole. The typical fields might be as large as 1 kG and would almost surely be variable. Among the specific instances of possible real fields, no periodicities could be identified.
Kemp James C.
Rudy Richard J.
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