Other
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hrxs.confe..41s&link_type=abstract
High Resolution X-ray Spectroscopy with XMM-Newton and Chandra, Proceedings of the international workshop held at the Mullard Sp
Other
Scientific paper
We present a simultaneous Chandra and XMM-Newton observation of the Castor sextett, focusing on Castor A and Castor B. 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 separation ~4"). We compare the Chandra observation with XMM-Newton data obtained simultaneously. Albeit not able to resolve Castor A and Castor B from each other, the higher sensitivity of XMM-Newton allows for a quantitative analysis of their combined high-resolution spectrum. We use He-like line triplets to examine the temperature and the density in the corona of Castor AB, and find n_e = (0.5...1) x 10^10 cm^-3 (for oxygen) and n_e = 2 x 10^12 cm^-3 (for neon). The latter one is likely to be too high due to contamination of the Ne IX triplet with iron lines. Our comparison with the conditions of the coronal plasma of other stars shows that Castor AB behave like typical late-type coronal X-ray emitters supporting the common notion that the late-type secondaries within each spectroscopic binary are the sites of X-ray production.
Burwitz Vadim
Stelzer Beate
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