Other
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasj...43..823t&link_type=abstract
Astronomical Society of Japan, Publications (ISSN 0004-6264), vol. 43, no. 6, 1991, p. 823-839.
Other
17
Early Stars, Line Spectra, Peculiar Stars, Stellar Atmospheres, Stellar Magnetic Fields, A Stars, Circular Polarization, Cool Stars, Doppler Effect, Magnetic Stars, Zeeman Effect
Scientific paper
The magnetic intensification of coupled Fe II lines belonging to a common multiplet is theoretically investigated, where the relative difference (delta) in the line-strength is a good indicator of the magnetic field (H). It is shown that delta is not only a function of H, but also depends upon various other parameters; its behavior is controlled by the ratio of the Zeeman width to the Doppler width, as well as by the difference in component-patterns. Theoretical delta vs. H relations are applied to the hot Am star Omicron Peg with the results of H about 2-3 kG and microturbulence about 0 km/s, suggesting that the conventionally derived microturbulence-value of about 2 km/s may simply reflect the magnetic effect. As an alternative application, an empirical correlation between delta vs. H for cool Ap stars is examined and found to be consistent with the calculations.
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