Abstract
The analysis of seven spectra of the B6 He-weak star HD 143699 recorded by the SWP camera on board the International Ultraviolet Explorer reveals variations of the far ultraviolet spectral energy distribution shortwards of 1600 Å in spectra collected from 1994 April 12 to July 9. These variations do not seem to reflect rotational modulation. They could be caused by pulsation with the recently derived pulsation period close to 4 hr. The resonance line of Si ii at 1526.71 Å clearly shows an interstellar component. There is no evidence of C iv absorption at 1550 Å in any of the spectra.
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