Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2011-07-10
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
5 pages, 3 figures, 1 Table, JENAM-2011, European Week of Astronomy ans Space Science. Symposium of European Astronomical Soci
Scientific paper
The variability of twice ionized lines of carbon and silicon in the ultraviolet spectral region of the magnetic Bp star a Centauri is investigated. This study is based on the archival {\it International Ultraviolet Explorer} data obtained through the large aperture and in the low-dispersion mode. A comparison of the average {\iue} high-dispersion spectrum of a Cen with full synthetic spectrum as well as those including only lines of one element showed that six C III and six Si III lines are responsible for the depressions of the flux at $\lambda\lambda$ 1175.5 and 1300\AA, respectively. Investigation of the variability of flux in the core of depression at $\lambda$ 1775.5 \AA\ indicate that the fluxes do not vary within errors of measurements. On the other hand, the fluxes in the core of depression at $\lambda$ 1300 \AA\ varies significantly with amplitude of $\sim$0.2 mag. Moreover, the variability of this depression are in anti-phase with helium lines in the visual spectral region.
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