Microvariability of Line Profiles in the Spectrum of the Star ι Her

Abstract—Wepresent the results of a search for and analysis of line-profile variations in the spectrumof the star ι Her. The observations were acquired with the 1.8 m telescope of the Bohyunsan Optical Astronomy Observatory (Republic of Korea) in May–June 2004. We obtained 69 spectra of the star with signal-to-noise ratios ≈300 and a time resolution of 5–7 min. Profile variability was revealed for six lines of HI, HeI, and SiIII, in the central parts of the lines. The variability amplitude is ≈(1−2) % in units of the intensity of the adjacent continuum. Evidence was found for cyclic variations of the lines, with periods from ≈7h to≈2.9d. We conclude that ιHer belongs to the group of slowly pulsating stars. PACS numbers: 97.30.D DOI: 10.1134/S1063772906030061 1