Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-10-25
Astron.Astrophys. 431 (2005) 679-686
Astronomy and Astrophysics
Astrophysics
8 pages, 4 figures, 3 tables, accepted by A&A (30 Sept. 2004)
Scientific paper
10.1051/0004-6361:20041201
We present simultaneous ultraviolet and X-ray observations of the dMe-type flaring stars AT Mic, AU Mic, EV Lac, UV Cet and YZ CMi obtained with the XMM-Newton observatory. During 40 hours of simultaneous observation we identify 13 flares which occurred in both wave bands. For the first time, a correlation between X-ray and ultraviolet flux for stellar flares has been observed. We find power-law relationships between these two wavelength bands for the flare luminosity increase, as well as for flare energies, with power-law exponents between 1 and 2. We also observe a correlation between the ultraviolet flare energy and the X-ray luminosity increase, which is in agreement with the Neupert effect and demonstrates that chromospheric evaporation is taking place.
Audard Marc
Branduardi-Raymont Graziella
Guedel Manuel
Harra Louise K.
Kay H. R. M.
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