Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...228..403p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 228, no. 2, Feb. 1990, p. 403-425. Research supported by ASI.
Astronomy and Astrophysics
Astronomy
156
Flare Stars, Sky Surveys (Astronomy), Stellar Flares, X Ray Sources, Exosat Satellite, Solar Neighborhood, Spectrum Analysis, Stellar Activity
Scientific paper
Exosat Observatory observations of flare stars pertaining to 25 separate sources are examined. The Exosat instrumentation is described, and a data sample is presented. Quiescent and flaring emissions from UV Ceti-type flare stars as observed with a low-energy experiment on Exosat are discussed, and the results of the timing analysis of the low-energy data are analyzed, along with the results of the spectral analysis of the Exosat medium-energy flare data. It is observed that while all sources are detected by the low-energy experiment, the medium-energy data is limited only to large flares. It is concluded that the quiescent X-ray luminosity of different flare stars is related to the bolometric luminosity, with the quiescent X-ray emission changing little from one observation to another, and that there is a substantial variability over a different time scales, appearing in the form of either individual flares or of more gradual variations.
Pallavicini Roberto
Stella Luigi
Tagliaferri Giampiero
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