Cool Stars 14 - Submitted Abstract # 26
This version created on 05 October 2006

X-ray properties of classical and weak-lined T Tauri stars in the Cha
I dark cloud


Jan Robrade, Hamburger Sternwarte
J.H.M.M. Schmitt,  Hamburger Sternwarte

We present a deep XMM-Newton exposure of the northern-eastern fringe
of the Chameleon I dark cloud, revisiting a region observed with ROSAT
15 years ago.  We resolve several blended sources, detect many new
ones and search for counterparts at infra-red and optical wavelength.
Additionally we are able to investigate the X-ray properties of the
brighter sources, including 15 known T Tauri stars.  Using medium
resolution X-ray spectra we determine X-ray brightness, coronal
temperatures and emission measures and compare the properties of
classical T Tauri stars (CTTS) with those of weak-line T Tauri stars.
Furthermore, results from observations of several X-ray bright CTTS
are adopted to study the contribution of possible X-ray generating
mechanisms such as accretion shocks and magnetic activity.

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