Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-08-22
Astron.Astrophys.412:849-856,2003
Astronomy and Astrophysics
Astrophysics
8 pages, 7 figures, accepted by A&A
Scientific paper
10.1051/0004-6361:20034057
We report XMM-Newton observations of the eclipsing binary Algol A (B8V) and B (K2III). The XMM-Newton data cover the phase interval 0.35 - 0.58, i.e., specifically the time of optical secondary minimum, when the X-ray dark B-type star occults a major fraction of the X-ray bright K-type star. During the eclipse a flare was observed with complete light curve coverage. The decay part of the flare can be well described with an exponential decay law allowing a rectification of the light curve and a reconstruction of the flaring plasma region. The flare occurred near the limb of Algol B at a height of about 0.1R with plasma densities of a few times 10^11 cm^-3 consistent with spectroscopic density estimates. No eclipse of the quiescent X-ray emission is observed leading us to the conclusion that the overall coronal filling factor of Algol B is small.
Franco Glaura
Ness Jan-Use
Schmitt Juergen H. M. M.
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