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Astron. Astrophys. 353, 707-714 (2000)

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Spectrophotometric behavior of CU Virginis *

N.A. Sokolov 1,2

1 Central Astronomical Observatory at Pulkovo, St. Petersburg 196140, Russia (sokolov@gao.spb.ru)
2 St. Petersburg State University, St. Petersburg, Russia

Received 7 July 1999 / Accepted 22 October 1999


The spectrophotometric variability of the magnetic CP star CU Vir in the spectral region from 1150 Å to 7850 Å is investigated. This study is based on the archival IUE and published visual spectrophotometric data obtained at different phases of the rotational cycle. The light variations in the wavelength region longer than [FORMULA] 2000 Å are generally in antiphase to the variations in the shorter wavelength region, although the shapes of light curves are different. The existence of the "null wavelength region" at [FORMULA]2000 Å, where the amplitude of light variations is practically zero over the period of rotation, is confirmed. Moreover, the amplitudes of light variations reach the minimum values in the core of [FORMULA] line and in the near infrared region. The comparison of the monochromatic light curves with variations of the Si II features shows that the light variations in the far-UV are influenced by the non-uniformity of the silicon distribution over the stellar surface. The total integrated flux of CU Vir varies with phase by about 6.0%. The correlation between the total integrated flux and the magnetic field variations is discussed.

Key words: stars: atmospheres – stars: chemically peculiar – stars: fundamental parameters – stars: individual: HD 124224

* Based on INES data from the IUE satellite.

© European Southern Observatory (ESO) 2000

Online publication: December 17, 1999