Exosat Observations of Quiescent and Flaring Emission from M Dwarf Flare Stars
We present preliminary results of a comprehensive survey of X-ray observations of M dwarf flare stars obtained with the EXOSAT satellite. We discuss quiescent and flaring emission, and we provide evidence for the occurrence on stars of both short-lived and long-duration events, closely resembling compact and 2-ribbon flares on the Sun. We study time variability of these sources on a variety of time scales and we conclude that there is no observational evidence in EXOSAT data for continuous low-level microflaring activity of the type recently suggested as a mechanism of coronal heating in M dwarf flare stars.
KeywordsVariability Analysis Coronal Heating Flare Star Flaring Emission Exponential Decay Time
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- Ambruster, C.W., Sciortino, S. and Golub, L.: 1987, Ap. J. Suppl., in press.Google Scholar
- Bookbinder, J.A.: 1985, PhD Thesis, Harvard University.Google Scholar
- Collura, A., Pasquini, L. and Schmitt, J.H.M.M.: 1987, this volume.Google Scholar
- Gliese, W.: 1969, Catalogue of Nearby Stars. Veröffentlichungen des Astron. Rechen-Instituts, Heidelberg, Nr. 22.Google Scholar
- Haisch, B.M., Butler, C.J., Doyle, J.C. and Rodono, M.: 1987, Astron. Ap., in press. Pallavicini, R.: 1987, in Solar and Stellar Activity (E.H.Schroter and M. Schussler eds.), in press.Google Scholar
- Pettersen, B.R.: 1976, Catalogue of Flare Star Data. Inst. Theor. Astrophys. Blindern-Oslo, Report No. 46.Google Scholar