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

  title={Castor A and Castor B resolved in a simultaneous Chandra and XMM-Newton observation},
  author={Beate Stelzer and Vadim Burwitz},
  journal={Astronomy and Astrophysics},
We present a simultaneous Chandra and XMM-Newtonobservation of the Castor sextett, focusing on Castor A and Castor B, two spectroscopic binaries with early-type primaries. Our study represents the first unambiguous X-ray detection of all three visual components in the Castor sextett making use of the unprecedented spatial resolution of Chandra. Of the present day X-ray instruments only Chandra can isolate the X-ray lightcurves and spectra of Castor A and B (angular separation4 00 ). We compare… 
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