Other
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004xmm..prop....8s&link_type=abstract
XMM-Newton Proposal ID #03002701
Other
Stars, White Dwarfs, Solar System, Xx Cha, Xmm-Newton Proposal 03002701
Scientific paper
We propose to perform a 130 ksec pointing on the classical T Tauri star XX Cha with XMM-Newton to obtain a high-resolution RGS spectrum. XX Cha would be the third cTTS observed with high spectral resolution, and - just as in TW Hya and BP Tau - we expect to find very high densities (log n_e < 13 ), and a depletion of grain forming metals. With these data we want to show that the X-ray emission from cTTS arises - predominantly - from an accretion funnel shock and not from solar-like magnetic activity. If so, cTTS would be the big brothers to magnetic neutron stars. Further we want to study if the depletion of grain forming metals is a common feature in these accretion flows that can be ascribed presumably to the formation of planetesimals in the accretion disks around cTTS.
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