Abstract
The analysis of five spectra of the Hg Mn spectroscopic binary star HD 77350 recorded by the SWP camera on board the International Ultraviolet Explorer reveals one instance of variation of the far-ultraviolet flux of this star shortwards of 1800 Å. The analysis of the coadded SWP spectrum built from the high resolution SWP spectra obtained through the small aperture shows the importance of low excitation and resonance Si ii lines shortwards of 1540 Å, of the Ga ii and Ga iii resonance lines at 1414 and 1495 Å and of the Al ii resonance line at 1670 Å. A very rough estimate of a period from the currently available Transiting Exoplanet Survey Satellite lightcurves yields a value of 9.63 ± 0.18 days which could be the rotation period but this needs confirmation.
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