The giant spot on II PEG in late 1986

  • P. B. Byrne
Contributed Papers on Active Binary Stars
Part of the Lecture Notes in Physics book series (LNP, volume 291)


During September and November 1986 a light curve was recorded for the RS CVn star II Peg which was of an unprecedentedly large amplitude (Byrne, 1986). During December two moderately high resolution (∼25000) Hα spectra were obtained, one at light maximum, the other near light minimum. Analysis of the light and colour curves indicates that at least 16% of the star's surface was spotted. The Hα spectra indicate the presence of an appreciable column density of hydrogen gas, associated with the dominant spot and undergoing a systematic downward motion at ∼50 km s−1.


Light Curve Light Maximum Blue Wing Light Minimum Geometric Projection 
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Copyright information

© Springer-Verlag 1987

Authors and Affiliations

  • P. B. Byrne
    • 1
  1. 1.Armagh ObservatoryArmaghN. Ireland

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