Relationship between X-ray and ultraviolet emission of flares from dMe stars observed by XMM-Newton - Archive ouverte HAL Access content directly
Journal Articles Astronomy and Astrophysics - A&A Year : 2005

Relationship between X-ray and ultraviolet emission of flares from dMe stars observed by XMM-Newton

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Abstract

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 h 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.
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hal-03733313 , version 1 (06-10-2022)

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U. Mitra-Kraev, Louise K. Harra, Manuel Güdel, M. Audard, G. Branduardi-Raymont, et al.. Relationship between X-ray and ultraviolet emission of flares from dMe stars observed by XMM-Newton. Astronomy and Astrophysics - A&A, 2005, 431, pp.679-686. ⟨10.1051/0004-6361:20041201⟩. ⟨hal-03733313⟩
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