Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.253...89h&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 253, Nov. 1, 1991, p. 89-98.
Astronomy and Astrophysics
Astronomy
23
A Stars, Chromium, Magnetic Stars, Metallicity, Peculiar Stars, Doppler Effect, Spectral Line Width, Stellar Magnetic Fields
Scientific paper
This study presents Doppler images of the chromium distribution on the magnetic Ap stars Epsilon Ursae Majoris, 45 Herculis, and Omega Herculis. All images are characterized by the presence of a depleted band and at least one depleted spot. Epsilon Ursae Majoris and Omega Herculis also exhibit several spots of enhanced chromium lying in a ring of radius 40-50 deg and surround a depleted spot. 45 Herculis shows such a ring-like feature as well, although there is no depleted spot at its center. It is inferred from the shape and location of the depleted bands and spots that the band marks the location of the magnetic equator and the depleted spots mark the magnetic poles. Two interpretations for the appearance of a depleted band at the magnetic equator and depleted spots and the magnetic poles are discussed. The Doppler images point to horizontal diffusion of chromium in the presence of an almost pure dipole field.
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