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Coordinated ASCA Observations of Coronal Structure and Flares on the RS CVn Binary Sigma CrBThis NASA grant supported my ASCA observing and data analysis during AO 5. This research involved a multiwavelength observation of the short period (1.14 day) active binary sigma(sup 2) CrB using the ASCA and RXTE satellites and the NRAO VLA radio array. ASCA observed sigma(sup 2) CrB for 81 ksec on 1997 March 11-13. A large flare outburst, with a flare enhancement over of quiescence of a factor of 6, was seen starting on March 12.23. This flare was also observed by RXTE and the VLA. Two-temperature spectral fitting indicates the presence of a nonvarying cooler component at 8 mk and a hotter component that increased from a quiescent temperature of 22 mk to 50 mk at the peak of the flare. Continuous emission measure distributions derived from the spectra are consistent with the two-temperature fits and also indicate the presence of very hot (100 MK) plasma during the rise phase of the flare. The detailed analysis of all the spectral and radio data for sigma(sup 2) CrB is published in Osten et al. (2000).
Document ID
20000113127
Acquisition Source
Goddard Space Flight Center
Document Type
Contractor or Grantee Report
Authors
Brown, Alexander
(Colorado Univ. Boulder, CO United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 2000
Subject Category
Solar Physics
Funding Number(s)
CONTRACT_GRANT: NAG5-4783
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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