X-ray Flares of EV Lac: Statistics, Spectra, Diagnostics - Astrophysics > High Energy Astrophysical PhenomenaReportar como inadecuado




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Abstract: We study the spectral and temporal behavior of X-ray flares from the activeM-dwarf EV Lac in 200 ks of exposure with the Chandra-HETGS. We derive flareparameters by fitting an empirical function which characterizes the amplitude,shape, and scale. The flares range from very short <1 ks to long 10 ksduration events with a range of shapes and amplitudes for all durations. Weextract spectra for composite flares to study their mean evolution and tocompare flares of different lengths. Evolution of spectral features in thedensity-temperature plane shows probable sustained heating. The short flaresare significantly hotter than the longer flares. We determined an upper limitto the Fe K fluorescent flux, the best fit value being close to what isexpected for compact loops.



Autor: David P. Huenemoerder, Norbert S. Schulz, Paola Testa, Jeremy J. Drake, Rachel A. Osten, Fabio Reale

Fuente: https://arxiv.org/







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