Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...289..209g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 289, no. 1, p. 209-220
Astronomy and Astrophysics
Astrophysics
7
A Stars, Molecular Diffusion, Oxygen Spectra, Peculiar Stars, Stellar Magnetic Fields, Stellar Rotation, Abundance, Magnetic Effects, Spectrograms, Spectrum Analysis, Stellar Spectrophotometry, Variations
Scientific paper
The red lines of the O I multiplet at lambda 7773 A are observed at high resolution and their rotational variation is recorded for a sample of nine magnetic Ap stars. These lines are found to be weaker than for normal Ap stars. The irregular distribution of oxygen on the stellar surface is connected to the magnetic geometry for the stars HD 25823 (41 Tau), HD 74521 (49 Cnc), HD 112185 (epsilon UMa), HD 112413 (alpha2 CVn), and HD 125248 (CS Vir). For four of these stars, it is clearly established that oxygen is concentrated around a magnetic polar region. The interpretation of the observed trends adds new constraints to the theory of radiative diffusion of oxygen in Ap stars.
Artru Marie-Christine
González Javier Francisco
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