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| Paper: |
Spectrally-Resolved Light-curves from an XMM-Newton Survey of Stellar X-ray Flares |
| Volume: |
448, 16th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun |
| Page: |
1019 |
| Authors: |
Pye, J. P.; Rosen, S. R. |
| Abstract: |
The XMM-Newton 2XMM Serendipitous Source Catalogue is being used as the basis for a survey of stellar X-ray flares. As 2XMM (and its successive Data Releases) is the largest X-ray-source catalogue to date, and as X-ray light-curves are produced as standard data products, the catalogue provides 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.
We present recent results from the survey (based around flares from stars in the Hipparcos-Tycho catalogue), focussing on spectrally-resolved, ‘hardness-ratio’ (and hence temperature-sensitive) light-curves, generated as additional data products specifically for our flare survey. Whilst the target stars are mainly well-known coronally-active objects, most of the serendipitously-detected flaring stars have little previously published information, the X-ray flares thus providing the first indication of their highly active nature.
The hardness-ratio plots clearly illustrate the temperature variations characteristic of many flares, and provide an easily accessible overview of the data, prior to further analysis such as time-resolved spectral fitting. |
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