Other
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hrxs.confe..42s&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 the X-ray spectrum of TW Hya observed at high spectral resolution with the Reflection Grating Spectrometer onboard the XMM-Newton satellite. We determine line fluxes for individual emission lines in the high resolution spectrum, and find that the predominant emission is from neon and oxygen, with comparatively weak iron lines. No emission from magnesium and silicon is detected. Comparison to a Chandra HETGS observation carried out about one year before shows that TW Hya exhibits moderate, irregular variability. Unlike all other high-resolution X-ray spectra of late-type stars obtained so far the flux ratio between the forbidden f and the intercombination i line of helium-like ions is very low (R = f/i < 1) indicating high densities. For TW Hya we find n_e > 10^12 cm-3, while the density in typical stellar coronae is about two orders of magnitude lower. Together with the lack of Mg and Si emission this provides strong evidence that its X-ray emission is produced in a disk-fed accretion column (depleted of grain-forming elements) rather than by magnetic activity.
Neuhäuser Ralph
Stelzer Beate
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