Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...232..151m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 232, no. 1, June 1990, p. 151-172.
Astronomy and Astrophysics
Astrophysics
69
A Stars, Line Spectra, Peculiar Stars, Stellar Magnetic Fields, Stellar Spectra, Zeeman Effect, Astronomical Spectroscopy, Radial Velocity, Spectrum Analysis
Scientific paper
High-resolution, high SNR observations of a sample of sharp-lined A stars and of Ap stars showing resolved Zeeman split lines are presented. The Fe II lines 6147.7 A and 6149.2 A unexpectedly appear to be asymmetric in all stars where they are resolved. The blue component of the 6149.2 line, which is a Zeeman doublet, is deeper and narrower than its red component. For line 6147.7, whose Zeeman pattern does not differ much from a quadruplet, the red components are deeper than the blue ones. It is shown that a partial Paschen-Back effect can account for these properties. The potential implications of this finding for studies of magnetic Ap stars are discussed.
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