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Rosat Observations of Stellar Flares

Published online by Cambridge University Press:  12 April 2016

J. H. M. M. Schmitt
J. H. M. M. Schmitt*
Affiliation:
Max-Planck-Institut für Extraterrestrische Physik, D-85740 Garching bei München, Germany

Abstract

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X-ray observations of stellar flares obtained during the ROSAT all-sky survey as well as in the ROSAT pointing program are discussed. The ROSAT all-sky survey allowed—for the first time—an unbiased search for stellar flares among all types of stars. A fundamentally new result obtained is that flares can occur on all types of late-type stars, thus supporting the view that the X-ray emission from these stars is controlled by magnetic processes. Long-duration flares can be studied with the all-sky survey data particularly well, and an especially well-observed long-duration flare event on the flare star EV Lacertae is presented and discussed in detail. Finally, the issue of time variability on the shortest detectable timescales and the question of microflaring is discussed using ROSAT data from a pointed observation of UV Ceti.

Subject headings: stars: coronae — stars: flare — stars: late-type — X-rays: stars

Type
Stars
Information
International Astronomical Union Colloquium , Volume 142: Particle Acceleration Phenomena in Astrophysical Plasmas , 1994 , pp. 735 - 742
Copyright
Copyright © The American Astronomical Society 1994

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