Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...203.1214a&link_type=abstract
American Astronomical Society Meeting 203, #12.14; Bulletin of the American Astronomical Society, Vol. 35, p.1224
Astronomy and Astrophysics
Astronomy
Scientific paper
XMM-Newton and the VLA simultaneously observed the eclipsing Algol-type binary RZ Cassiopeiae in August 2003. The secondary eclipse (K3 IV companion behind the A3 V primary) was placed at the center of the 15-hour radio campaign, while the X-ray satellite monitored a full 1.2 day orbital period. We present here preliminary results of the X-ray campaign with XMM-Newton. The X-ray light curve shows significant modulation probably related to rotational modulation, and even small flares. However, the X-ray eclipse is not deep, implying that the coronal X-ray emitting material is spatially extended. The Reflection Grating Spectrometer spectrum shows a variety of bright emission lines from Fe, Ne, O, N. However, the C VI Lyα line is not detected. The strong [C/N] depletion probably reflects the surface composition of the secondary which fills its Roche lobe and loses material onto the primary. The O VII He-like triplet reflects a low forbidden-to-intercombination ratio; while it generally suggests high electron densities, the ratio is here modified by photoexcitation by the strong UV flux of the primary A3 V star.
Audard Marc
Güdel Manuel
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