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We present a simultaneous Chandra and XMM-Newton observation of the Castorsextett, focusing on Castor A and Castor B, two spectroscopic binaries withearly-type primaries. Of the present day X-ray instruments only Chandra canisolate the X-ray lightcurves and spectra of A and B. We compare the Chandraobservation with XMM-Newton data obtained simultaneously. Albeit not able toresolve Castor A and Castor B from each other, the higher sensitivity ofXMM-Newton allows for a quantitative analysis of their combined high-resolutionspectrum. He-like line triplets are used to examine the temperature and thedensity in the corona of Castor AB. The temporal variability of Castor AB isstudied using data collected with the European Photon Imaging Camera onboardXMM-Newton. Strong flare activity is observed, and combining the data acquiredsimultaneously with Chandra and XMM-Newton each flare can be assigned to itshost. Our comparison with the conditions of the coronal plasma of other starsshows that Castor AB behave like typical late-type coronal X-ray emitterssupporting the common notion that the late-type secondaries within eachspectroscopic binary are the sites of the X-ray production.Comment: accepted for publication in A&

Castor A and Castor B resolved in a simultaneous Chandra and XMM-Newton observation