A study of the flaring and quiescent X-ray and UV emission from II Pegasi

Details A study of the flaring and quiescent X-ray and UV emission from II Pegasi A study of the flaring and quiescent X-ray and UV emission from II Pegasi

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...251..161t&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 251, no. 1, Nov. 1991, p. 161-170.

Astronomy and Astrophysics

Astronomy

21

Binary Stars, Light Curve, Spaceborne Astronomy, Stellar Flares, Ultraviolet Emission, X Ray Spectra, Exosat Satellite, Iue, Stellar Luminosity, Stellar Spectra

Scientific paper

An investigation has been conducted of the rotational modulation of the transition-region UV and coronal X-ray emission for the RS CVn system II Pegasi. The X-ray light curve is dominated by a strong flare detected at orbital phase, where the minimum of the photometric wave occurred. The flare parameters derived show that the flare originates with a height greater than half the stellar radius. The characteristics of the flare are similar to those of a solar two-ribbon flare; a comparison of the midtransition region density with that in the coronal region shows a very steep pressure gradient.

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