Spectroscopic observations of the surface-active binary II Pegasi /HD 224085/

Details Spectroscopic observations of the surface-active binary II Pegasi /HD 224085/ Spectroscopic observations of the surface-active binary II Pegasi /HD 224085/

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980pasp...92..333b&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 92, June 1980, p. 333-337.

Astronomy and Astrophysics

Astronomy

19

Binary Stars, H Alpha Line, Periodic Variations, Stellar Luminosity, Stellar Spectrophotometry, Emission Spectra, Line Spectra, Spectral Emission, Stellar Evolution, Stellar Rotation

Scientific paper

Spectroscopy of the surface-active binary II Peg (HD 224085) shows the H-alpha emission feature to be variable in equivalent width (EW) by a factor of ten on time scales of several days. Most of the EW variability is in phase with the stellar rotation period, suggesting strong localization of H-alpha emitting regions. However, sudden, flare-like enhancements of H-alpha are seen which exhibit decay times of days. Echelle spectrograms of the H-alpha profile show a noticeable red asymmetry, reminiscent of the emission profile exhibited by the RS CVn binary V711 Tau (HR 1099). An interpretation of the behavior of II Peg in the context of BY Dra or pre-main-sequence variability does not appear to be necessary.

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