The Behavior of HgMn Stars in the Far UV −4: ι CrB A

Abstract

Abstract The analysis of twelve high resolution SWP spectra of the HgMn star HD 143807 A (ι CrB A) obtained through the large aperture recorded by the International Ultraviolet Explorer reveals that the far-ultraviolet flux of this star remained constant over the various observations with IUE. The TESS lightcurve of ι CrB does not show evidence for periodic variability. The absence of far and mid-UV variability and the reproducibility of the brightness in the V band during the IUE observations precludes the presence of large chemical gradients over the surface of ι CrB at the epoch of the IUE observations. The analysis of six high resolution SOPHIE spectra obtained over three consecutive nights in 2007 March does not show any variations of the lines, either in reduced intensity nor in radial velocity.