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Astron. Astrophys. 345, 121-126 (1999)

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Bayesian flare event detection

ROSAT X-ray observations of the UV Cetus type star G 131-026

V. Hambaryan  * , R. Neuhäuser and B. Stelzer

Max-Planck-Institut für Extraterrestrische Physik, D-85740 Garching, Germany

Received 18 January 1999 / Accepted 10 February 1999


We have analyzed ROSAT PSPC observations for flare detection using a formalism of Bayesian model comparison. The method is applicable to the direct unbinned data and divides the whole observation into the most probable partitioning of non-uniform segments during which the photon arrival rate had no statistically significant variation. If more than one such segment is found with significantly different count rates, then variability is detected. As an example for this method, we show how a flare on the X-ray source RX J0008.8+2050, the counterpart of the UV Cet type star G 131-026, located in the solar vicinity, is detected and various items relevant to flare parameter estimation are discussed.

Key words: methods: statistical – stars: flare – stars: individual: G 131-026 – stars: variables: general – X-rays: stars

* Visiting Astronomer from Byurakan Astrophysical Observatory, Armenia

Send offprint requests to: V. Hambaryan (vhambary@mpe.mpg.de)

© European Southern Observatory (ESO) 1999

Online publication: April 12, 1999