Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...414l..57p&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 414, no. 2, p. L57-L60.
Astronomy and Astrophysics
Astrophysics
8
Eclipsing Binary Stars, Extreme Ultraviolet Explorer Satellite, G Stars, K Stars, Astronomical Satellites, Emission Spectra, Stellar Coronas, Stellar Flares
Scientific paper
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).
Bowyer Stuart
Brown Adrian
Jelinsky Pat
Patterer Robert Joseph
Vedder Peter W.
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