The 1-20 keV Spectrum of HR 1099 as Observed with RXTE

S.A. Drake, N.E. White, K.P. Singh, A. Brown, T. Simon

Presentations at the 10th Cambridge Workshop ``Cool Stars, Stellar Systems and the Sun,'' Cambridge, MA, 1997 July 15-19

Abstract

We have observed the RS CVn binary HR 1099 (V711 Tauri) with the Rossi X-Ray Timing Explorer (RXTE) as part of a joint EUVE/RXTE/VLA campaign. No large flares occurred during the RXTE observations although small flare and low-level stochastic variability appear to be present. HR 1099 was detected as a 15 counts per second PCA source, but was not detected by the (higher energy) HEXTE instrument. The non-flare PCA spectrum can be fit with a 2 keV coronal plasma model with a metal abundance that is 1/5 of the solar photospheric value, while the flare spectrum is both harder (2.5 keV temperature) and less metal deficient (2/3 solar). We compare these results with those from previous X-ray observations of this system.

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