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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…
XMM-Newton and VLA Observations of the Variable Wolf-Rayet Star EZ CMa: Evidence for a Close Companion?
S. L. Skinner, S. A. Zhekov, M. Guedel +1
We present new X-ray and radio observations of the WR star EZ CMa (HD 50896) obtained with XMM-Newton and the VLA. This WN4 star shows optical/UV variability at a period of 3.76 d…
Stellar Radio Astronomy. Probing Stellar Atmospheres from Protostars to Giants
Manuel Guedel
Radio astronomy has provided evidence for the presence of ionized atmospheres around almost all classes of non-degenerate stars. Magnetically confined coronae dominate in the cool…
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…
XMM-Newton Detection of Hard X-ray Emission in the Nitrogen-Type Wolf-Rayet Star WR110
S. L. Skinner, S. A. Zhekov, M. Guedel +1
We have used the excellent sensitivity of XMM-Newton to obtain the first high-quality X-ray spectrum of a Wolf-Rayet (WR) star which is not known to be a member of a binary system.…