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Extreme Ultraviolet Explorer observations of the RS Canum Venaticorum systems AR Lacertae and II PegasiWe 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).
Document ID
19930072106
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Petterer, R. J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Vedder, P. W.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Jelinsky, P.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Brown, A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Bowyer, S.
(California Univ. Berkeley, United States)
Date Acquired
August 16, 2013
Publication Date
September 10, 1993
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 414
Issue: 2
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
93A56103
Funding Number(s)
CONTRACT_GRANT: NAS5-30180
Distribution Limits
Public
Copyright
Other

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