Kholtygin et al., "iota Her", AZh (2006)

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Kholtygin et al., "iota Her", AZh (2006) Kholtygin A.F., Galazutdinov G.A., Burlakova T.E., Valyavin G.G., Fabrika S.N., Lee B.-C.
Microvariability of Line Profiles in the Spectrum of the Star iota Her
Astronomy Reports, 50, 230-231 (2006) Original Russian Text published in Astronomicheskii Zhurnal, 83, No. 3, pp. 252-264 (2006)

We present the results of a search for and analysis of line-profile variations in the spectrum of the star iota 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 about of 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 about of (1.2)% in units of the intensity of the adjacent continuum. Evidence was found for cyclic variations of the lines, with periods from 7 hour to 2.9 day. We conclude that iota Her belongs to the group of slowly pulsating B (SPB) stars.