Microvariability of line profiles in the spectrum of the star ι Her

Details Microvariability of line profiles in the spectrum of the star ι Her Microvariability of line profiles in the spectrum of the star ι Her

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006arep...50..220k&link_type=abstract

Astronomy Reports, Volume 50, Issue 3, p.220-231

Astronomy and Astrophysics

Astronomy

1

Pacs Numbers 97.30.D

Scientific paper

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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