ROSAT observations of stellar flares

Details ROSAT observations of stellar flares ROSAT observations of stellar flares

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apjs...90..735s&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 90, no. 2, p. 735-742

Astronomy and Astrophysics

Astronomy

47

Rosat Mission, Spaceborne Astronomy, Stellar Coronas, Stellar Flares, Stellar Models, X Ray Astronomy, Flare Stars, Late Stars, Magnetic Effects, Proportional Counters, Sky Surveys (Astronomy), X Ray Stars

Scientific paper

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.

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