Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...220..221v&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 220, no. 1-2, Aug. 1989, p. 221-225.
Astronomy and Astrophysics
Astrophysics
5
Flare Stars, Stellar Coronas, X Ray Stars, Luminosity, Standard Deviation, Stellar Flares, Variability
Scientific paper
The serendipitous X-ray source EXO 040830-7134.7 is identified with a m(v) = 12.5 dMe star. A total of 30 observations of this source were made with the Exosat low energy telescope during an interval of two years, representing the most complete long term coverage of X-ray emission from a single dMe star. In the usually observed quiescent state, the X-ray luminosity of EXO 040830-7134.7 can be described by a normal distribution with a standard deviation of 0.4 times the average value. During two observations, the source was almost a factor 3 brighter than average. Additionally, during one observation, the source was detected to be a factor 7 brighter than average for at least two hours. If this increase is due to a stellar flare, then both the totally emitted flux and typical recurrence time of the flare indicate that it is quite unlike strong X-ray flares observed in dMe flare stars so far.
Beuermann Klaus
Tagliaferri Giampiero
Thomas Hans-Christoph
van der Woerd Hans
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