Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.228..109s&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 228, Sept. 1, 1987, p. 109-118.
Astronomy and Astrophysics
Astronomy
1
Astronomical Photography, Magnetic Measurement, Statistical Tests, Stellar Magnetic Fields, Supergiant Stars, A Stars, Error Analysis, Magnetic Flux, Scaling Laws
Scientific paper
The author proposes a number of straightforward statistical tests aimed at establishing the significance of stellar magnetic field measurements obtained with Babcock's photographic technique. The power of these methods is illustrated with three Ap stars for which the presence of a magnetic field can be established at an exceedingly high significance level. Application to the supergiant Canopus on the contrary gives no support to the claims for the detection of a kilogauss surface field. Further investigations involving classical scaling and an error analysis of the MSHIFT correlation method favour the view that instrumental instabilities are at the origin of the apparent magnetic variations in Canopus.
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