  We report on the analysis of high resolution X-ray spectra of two
pre-main-sequence stars: TWA 5 (observed with XMM-Newton) and PZ Telescopii
(observed with Chandra/HETGS). TWA 5 is a classical T Tauri star in the TW
Hydrae association while PZ Tel is a rapidly rotating weak-lined T Tauri star
in the beta-Pictoris moving group. For both stars we have reconstructed the
emission measure distribution and derived the coronal abundances to check for
possible patterns of the abundances related to the first ionization potential
of the various elements. We have also derived estimates of the plasma density
from the analysis of the He-like triplets. We compare the characteristics of
our targets with those of other pre-main sequence stars previously analyzed by
other authors: TW Hya, HD 98800 and HD 283572. Our findings suggest that X-ray
emission from classical T Tauri and weak-lined T Tauri stars is produced in all
cases by magnetically-heated coronae, except for TW Hya which has unique plasma
temperatures and densities. Moreover we derive that TWA 5 has the same peculiar
Ne/Fe abundance ratio as TW Hya.

Astrophysics