Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...245..624m&link_type=abstract
Astrophysical Journal, Part 1, vol. 245, Apr. 15, 1981, p. 624-629.
Astronomy and Astrophysics
Astrophysics
29
Dwarf Stars, Late Stars, Stellar Magnetic Fields, Zeeman Effect, Noise Spectra, Rotating Bodies, Signal To Noise Ratios, Solar Activity, Spectrum Analysis
Scientific paper
An attempt is made to detect Zeeman splitting in five high resolution, high signal-to-noise spectra of a magnetically sensitive line in Xi Bootis A, through a comparison of this line with a magnetically insensitive one. No convincing evidence for the existence of magnetic fields on Xi Boo A results, in contrast to the previous detection by means of a similar technique of 2650 gauss, 20-45% surface area fields. The possibility of a variable magnetic field on Xi Boo A is supported by measurements of chromospheric and coronal diagnostics, all of which fluctuate with time. A comparison between active regions of Xi Boo A and those of the sun is drawn, indicating the possibility of significant differences between the two.
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