Extreme Ultraviolet Explorer observations of the RS Canum Venaticorum systems AR Lacertae and II Pegasi

Abstract

view Abstract Citations (8) References (16) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Extreme Ultraviolet Explorer Observations of the RS Canum Venaticorum Systems AR Lacertae and II Pegasi Patterer, R. J. ; Vedder, P. W. ; Jelinsky, P. ; Brown, A. ; Bowyer, S. Abstract We report observations of two RS CVn systems, II Peg and AR Lac, which were calibration targets during the in-orbit checkout phase of the Extreme Ultraviolet Explorer (EUVE). We have determined count rates, and, based on these count rates, preliminary emission measure analyses have been done. The Lexan/boron band count rates were 0.0849 +/- 0.0023 counts/s for AR Lac and 0.218 +/- 0.031 counts/s for II Peg during its quiescent state. Temperatures and emission measures derived from the EUVE data are consistent with previously published values. We also report a flare seen during the II Peg observations which has characteristics similar to previously observed flares on II Peg. During the flare the Lexan/boron count rate increased by at least a factor of 2.5, and the minimum total duration was about 34,000 s (about 9.4 hr). Publication: The Astrophysical Journal Pub Date: September 1993 DOI: 10.1086/186995 Bibcode: 1993ApJ...414L..57P Keywords: Eclipsing Binary Stars; Extreme Ultraviolet Explorer Satellite; G Stars; K Stars; Astronomical Satellites; Emission Spectra; Stellar Coronas; Stellar Flares; Astrophysics; STARS: CORONAE; STARS: INDIVIDUAL CONSTELLATION NAME: AR LACERTAE; STARS: INDIVIDUAL CONSTELLATION NAME: II PEGASI; STARS: LATE-TYPE full text sources ADS | data products SIMBAD (2) MAST (1)