A survey of stellar X-ray flares from the XMM-Newton serendipitous source catalogue: Hipparcos-Tycho cool stars
J. P. Pye (1), S. Rosen (1), D. Fyfe (1), A. C. Schroeder (1, 2), ((1) University of Leicester, (2) South African Astronomical Observatory)

TL;DR
This survey analyzes X-ray flares from cool stars using the XMM-Newton catalogue, providing insights into flare characteristics, energetics, and spectral variations, and highlighting the importance of unbiased sampling for future surveys.
Contribution
It offers a comprehensive, large-scale analysis of stellar X-ray flares from the XMM-Newton catalogue, including spectral and energetic properties, and emphasizes the significance of serendipitous observations for unbiased flare studies.
Findings
Approximately 130 flares from 70 stars analyzed.
Flares range from 1,000 to 10,000 seconds in duration.
Flare energies span from 10^32 to 10^35 erg.
Abstract
The X-ray emission from flares on cool (i.e. spectral-type F-M) stars is indicative of very energetic, transient phenomena, associated with energy release via magnetic reconnection. We present a uniform, large-scale survey of X-ray flare emission. The XMM-Newton Serendipitous Source Catalogue and its associated data products provide an excellent basis for a comprehensive and sensitive survey of stellar flares - both from targeted active stars and from those observed serendipitously in the half-degree diameter field-of-view of each observation. The 2XMM Catalogue and the associated time-series (`light-curve') data products have been used as the basis for a survey of X-ray flares from cool stars in the Hipparcos Tycho-2 catalogue. In addition, we have generated and analysed spectrally-resolved (i.e. hardness-ratio), X-ray light-curves. Where available, we have compared XMM OM UV/optical…
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