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X-Ray Evidence for Flare Density Variations and Continual Chromospheric Evaporation in Proxima Centauri
Manuel Guedel, Marc Audard, Stephen L. Skinner +1
Using the XMM-Newton X-ray observatory to monitor the nearest star to the Sun, Proxima Centauri, we recorded the weakest X-ray flares on a magnetically active star ever observed. C…
Are Coronae of Magnetically Active Stars Heated by Flares? II. EUV and X-Ray Flare Statistics and the Differential Emission Measure Distribution
Manuel Guedel, Marc Audard, Vinay L. Kashyap +2
(Abridged) We investigate the EUV and X-ray flare rate distribution in radiated energy of the late-type active star AD Leo using long EUVE and BeppoSAX observations. We compare the…
Flare Heating in Stellar Coronae
Vinay Kashyap, Jeremy Drake, Manuel Guedel +1
We investigate the contribution of very weak flares to the coronal luminosity of low-mass active stars. We analyze EUVE/DS events data from FK Aqr, V1054 Oph, and AD Leo and conclu…
Detection of the Neupert Effect in the Corona of an RS CVn Binary System by XMM-Newton and the VLA
M. Guedel, M. Audard, K. W. Smith +3
The RS CVn-type binary Geminorum was observed during a large, long-duration flare simultaneously with {\it XMM-Newton} and the VLA. The light curves show a characteristic time…
The Chandra LETG and XMM-Newton Spectra of HR 1099
M. Audard, M. Guedel, R. L. J. van der Meer
The X-ray luminous RS CVn binary system HR 1099 has been observed on several occasions in the early phases of \textit{Chandra} and \textit{XMM-Newton}. A very hot (up to 40 MK) dom…
Elemental Abundances in Stellar Coronae with XMM-Newton
Marc Audard, Manuel Guedel
The XMM-Newton Reflection Grating Spectrometer Team has obtained observations ofa large number of coronal sources of various activity levels, ages, and spectraltypes. In particular…