Abstract
The analysis of 18 high resolution spectra of the chemically peculiar star HR 1079 recorded by the International Ultraviolet Explorer reveals large amplitude variations of the far ultraviolet flux (about 80% flux decrease at minimum compared to maximum) over the various observations with IUE. These variations could reflect the presence of spots over the surface of HD 21933. The TESS lightcurve of HD 21933 has a complex structure which resembles a double sine structure. The time intervals separating successive minima are not constant but range from 1.16 to 1.32 ± 0.03 days.
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