Rotational modulation and flares on RS Canum Venaqticorum and BY Draconis stars. XII - Near-to-simultaneous high resolution UV and optical observations of II Pegasi during July 1984

Details Rotational modulation and flares on RS Canum Venaqticorum and BY Draconis stars. XII - Near-to-simultaneous high resolution UV and optical observations of II Pegasi during July 1984 Rotational modulation and flares on RS Canum Venaqticorum and BY Draconis stars. XII - Near-to-simultaneous high resolution UV and optical observations of II Pegasi during July 1984

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...214..227b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 214, no. 1-2, April 1989, p. 227-238.

Astronomy and Astrophysics

Astrophysics

10

Irregular Variable Stars, Starspots, Stellar Flares, Stellar Rotation, Astronomical Spectroscopy, H Alpha Line, Lyman Alpha Radiation, Stellar Composition, Ultraviolet Spectroscopy

Scientific paper

Nearly simultaneous high resolution ground-based optical and IUE satellite UV spectroscopy and an optical light curve of the RS CVn star II Peg are presented. It is shown that the chromospheric and transition region radiative losses of the star in July 1984 are lower than previously recorded means. The flux in the Lyman-alpha line is estimated and evidence is given for variability in all of the emission lines. This variability appears to be correlated with the optical spots. Line profiles at two rotational phases for the principal UV emission lines show an excess broadening over and above the combined instrumental plus Doppler broadening.

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