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Astron. Astrophys. 354, 847-852 (2000) AcknowledgementsThe software used in this work has been developed by Pär-Ola Nilsson, Jan Karlsson and Fredrik Rutqvist of the Umeå Division of the Swedish Institute of Space Physics. The data used in the present analysis are ROSAT PSPC photon event history files obtained through the High Energy Astrophysics Science Archive Research Center Online Service, provided by the NASA/Goddard Space Flight Center. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 2000 Online publication: February 25, 2000 ![]() |