X-RAY FLARES OF EV Lac: STATISTICS, SPECTRA, AND DIAGNOSTICS
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Huenemoerder-2010-X-RAY FLARES OF EV L.pdf
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Author(s)
Huenemoerder, David P.
Schulz, Norbert S.
Testa, Paola
Drake, Jeremy J.
Osten, Rachel A.
Reale, Fabio
Date Issued
November 2010
Journal
Astrophysical Journal
Publisher
Institute of Physics/American Astronomical Society
Citation
Huenemoerder, David P., Norbert S. Schulz, Paola Testa, Jeremy J. Drake, Rachel A. Osten, and Fabio Reale. “X-RAY FLARES OF EV Lac: STATISTICS, SPECTRA, AND DIAGNOSTICS.” The Astrophysical Journal 723, no. 2 (October 25, 2010): 1558–1567. © 2010 American Astronomical Society.
Version
Final published version
Abstract
We study the spectral and temporal behavior of X-ray flares from the active M dwarf EV Lac in 200 ks of exposure with the Chandra/HETGS. We derive flare parameters by fitting an empirical function which characterizes the amplitude, shape, and scale. The flares range from very short (<1 ks) to long (~10[superscript 4] s) duration events with a range of shapes and amplitudes for all durations. We extract spectra for composite flares to study their mean evolution and to compare flares of different lengths. Evolution of spectral features in the density-temperature plane shows probable sustained heating. The short flares are significantly hotter than the longer flares. We determined an upper limit to the Fe K fluorescent flux, the best-fit value being close to what is expected for compact loops.
MIT Department
MIT Kavli Institute for Astrophysics and Space Research
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1088/0004-637x/723/2/1558
