AP stars with resolved magnetically split lines

Details AP stars with resolved magnetically split lines AP stars with resolved magnetically split lines

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...256..169m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 256, no. 1, p. 169-184.

Astronomy and Astrophysics

Astrophysics

56

A Stars, Line Shape, Peculiar Stars, Stellar Magnetic Fields, Stellar Spectra, Metallicity, Spectral Resolution, Stellar Spectrophotometry

Scientific paper

New high-resolution spectroscopic observations of Ap stars with resolved magnetically split spectral lines are presented. Six new such stars have been discovered: HD 2453, HD 9996, HD 18078, HD 50169, HD 137949, and HD 192678. This raises the total number of known Ap stars with resolved magnetically split lines to 21. The spectral line profiles observed in two more stars, HD 111133 and HD 147010, are strongly affected by the magnetic field, but they are not fully resolved, due to nonnegligible rotational Doppler effect. Observations of fairly sharp-lined Ap stars whose lines are unresolved are also presented. The relative difference between the equivalent widths of the Fe II lines 6147.7 A and 6149.2 A is shown to increase with the mean magnetic field modulus. The existence of a simple, unambiguous correlation between the mean magnetic field modulus and the index Z of Geneva photometry, which had previously been advocated, is not confirmed. At most, stars with large negative values of Z may be more prone to have strong magnetic fields, but the evidence for this is not statistically strong.

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