Detected UV variability in the IUE spectra of the Ap-Si star HD 25823

Details Detected UV variability in the IUE spectra of the Ap-Si star HD 25823 Detected UV variability in the IUE spectra of the Ap-Si star HD 25823

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.281a.413f&link_type=abstract

In ESA, A Decade of UV Astronomy with the IUE Satellite, Volume 1 p 413-415 (SEE N89-10682 01-89)

Astronomy and Astrophysics

Astronomy

Iue, Magnetic Stars, Peculiar Stars, Spaceborne Astronomy, Ultraviolet Astronomy, Ultraviolet Spectra, Variability, Abundance, Gallium, Silicon, Stellar Magnetic Fields

Scientific paper

Spectral UV variabilities for the Ap-Si star HD 25823 are detected from 5 SWP IUE images. This peculiar and magnetic star presents also an uncommon overabundance of gallium. From the observations, it seems that silicon and gallium (and also other) abundance varies according to the rotational period of the star, as does the magnetic field. The anticorrelation observed between periodic variations of silicon and gallium confirms the predictions of diffusion theory.

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