X-ray Flares of EV Lac: Statistics, Spectra, and Diagnostics

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

Risultato della ricerca: Article

7 Citazioni (Scopus)

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 (~104 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.
Lingua originaleEnglish
pagine (da-a)1558-1567
Numero di pagine10
RivistaTHE ASTROPHYSICAL JOURNAL
Volume723
Stato di pubblicazionePublished - 2010

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Reale, F., Osten, R. A., Huenemoerder, D. P., Schulz, N. S., Drake, J. J., & Testa, P. (2010). X-ray Flares of EV Lac: Statistics, Spectra, and Diagnostics. THE ASTROPHYSICAL JOURNAL, 723, 1558-1567.