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Session 25 - Stars in the Ultraviolet.
Display session, Tuesday, June 10
South Main Hall,

[25.09] Multiwavelength Coronal Studies of the RS CVn Binaries \sigma^2 CrB and HR1099

A. Brown, R. A. Osten, T. R. Ayres (CASA, Univ. Colorado), S. A. Drake (HEASARC-GSFC)

We have used the ASCA, XTE, and EUVE satellites and the VLA radio array to study the coronal emission from the RS CVn binaries \sigma^2 CrB, observed 1997 March 11-13, and HR1099 (V711 Tau), observed 1996 September 1-11 with additional, more limited, observations during the period 1996 October 9-22. We present time-resolved analyses of the variable coronal emission, including flares, from these systems. \sigma^2 CrB was observed simultaneously by ASCA, XTE, and VLA, while simultaneous observations of HR1099 were obtained by XTE, EUVE, and VLA. During these observations HR1099 underwent a very large flare lasting 3 days. In addition we present a synopsis of the coronal variability seen for HR1099 from a total EUVE coverage lasting 34 days obtained between 1992 and 1996.

This work is supported by NASA Grants NAG5-2259, NAG5-2530, amp; NAG5-3226 to the University of Colorado.

Program listing for Tuesday