Chandra, EUVE, and VLA Observations of the Active Binary System
Sigma^2 Coronae Borealis
Rachel Osten, Alexander Brown, & Jeffrey Linsky
Institute: University of Colorado
Contact Email: raosten@casa.colorado.edu
Abstract:
We report on a multi-wavelength campaign to observe the short period
(P_orb = 27.4 hr) active binary system Sigma^2 CrB (F6V + G0V) with
Chandra ACIS-S+HETG, EUVE, and the VLA in 2000 June. Simultaneous radio
and X-ray observations of flares provide insights into the thermal and
non-thermal nature of the flare process. The EUVE observation spanned
8.3 days, in the middle of which occurred the 23.9 hour Chandra observation
and the 10 hour VLA observation. Within the space of two consecutive
orbital periods during EUVE's stare, the system underwent five flare
events, the first of which was observed with Chandra. We discuss the search
for flare-related and orbital phase-related motions in the bright lines of
Ne X 12.13 A and Mg XII 8.42 A using the Chandra HETG data. We discuss
data reduction and analysis of the Chandra observation, deriving electron
densities, emission measure distributions, abundances of N, O, Ne, Mg, Al,
Si, S, Ar, and F relative to H for quiescent and flaring conditions. We
also discuss radio/X-ray correlations of flares.
No manuscript was submitted to these Proceedings.
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"The Future of Cool-Star Astrophysics', 2003, Eds. A. Brown,
G. M. Harper, & T. R. Ayres.
Proceedings of 12th Cambridge Workshop on Cool Stars, Stellar Systems,
& The Sun,
© 2003 University of Colorado.