Simultaneous ROSAT XRT and WFC observations of a sample of active dwarf stars

Details Simultaneous ROSAT XRT and WFC observations of a sample of active dwarf stars Simultaneous ROSAT XRT and WFC observations of a sample of active dwarf stars

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.319.1136t&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 319, Issue 4, pp. 1136-1146.

Astronomy and Astrophysics

Astronomy

4

Stars: Activity, Stars: Flare, Stars: Late-Type

Scientific paper

The X-ray observations of the ROSAT-PSPC All-Sky Survey have revealed bright and energetic coronae for a number of late-type main-sequence stars, many of them flare stars. We have detected 31 X-ray flares on 14 stars. A search for simultaneous X-ray and EUV (extreme ultraviolet) flares using ROSAT Wide Field Camera survey data revealed a large number of simultaneous flares. These results indicate that the heating mechanisms of the X-ray and EUV-emitting regions of the stellar coronae are similar. We find X-ray quiescent variability for nine of the 14 stars and simultaneous X-ray and EUV quiescent variability for seven of these nine stars. These results imply that the stellar coronae are in a continuous state of low-level activity. There are tight linear correlations of X-ray flare luminosity with the `quiescent' X-ray as well as with the stellar bolometric luminosity. The similarity between the X-ray-to-EUV quiescent and flare luminosity ratios suggests that the two underlying spectra are also similar. Both are indeed consistent with the previously determined Einstein two-temperature models. We suggest that both the variability and spectral results could indicate that the quiescent emission is composed of a multitude of unresolved flares.

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