A technique for measuring magnetic fields on solar-type stars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Late Stars, Magnetic Flux, Magnetic Measurement, Stellar Magnetic Fields, Stellar Spectrophotometry, Absorption Spectra, Error Analysis, High Resolution, Line Spectra, Spectral Line Width, Spectral Resolution, Zeeman Effect

Scientific paper

A method is developed and tested by which magnetic-field strengths and area filling-factors of magnetic regions on late-type stars may be inferred from high-resolution, absorption-line profiles that have been broadened by the Zeeman effect. The technique involves fitting such profiles with a triplet of components, the shape of which is derived from profiles of lines of low Zeeman sensitivity. Tests of the systematic and random errors indicate that such magnetic flux measurements have an uncertainty of 20% for stars with field strengths of 2000 gauss if at least 10% of the stellar surface contains magnetic regions.

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