Microvariability of line profiles in the spectrum of the star ι Her |
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| Authors: | A F Kholtygin G A Galazutdinov T E Burlakova G G Valyavin S N Fabrika B -C Lee |
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| Institution: | (1) Astronomical Institute, St. Petersburg State University, Universitetskiĭ pr. 28, Petrodvorets, 198504, Russia;(2) Special Astrophysical Observatory, Nizhniĭ Arkhyz, Karachaĭ-Cherkessian Republic, 357147, Russia;(3) Korea Astronomy and Space Science Institute, 61-1, Hwaam-dong, Yuseong-gu, Daejeon, 305-348, Republic of Korea;(4) Bohyunsan Optical Astronomy Observatory, Jacheon P.O.B., Young-chun, Kyung-pook, 770-820, Republic of Korea |
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| Abstract: | We present the results of a search for and analysis of line-profile variations in the spectrum of 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 ι Her belongs to the group of slowly pulsating stars. |
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