KINEMATICS OF T TAURI STARS IN CHAMELEON

We study the kinematics of T Tauri stars (TTS) located in the cores of the Chamaeleon clouds as well as far off these clouds. Our sample com prises 2 early type stars known to be related to Cha I, 6 classical (C TTS) and 6 weak-line T Tauri stars (WTTS) known before the ROSAT missi on, and 8 bonafide pre-main sequence (PMS) stars as well as 23 presuma bly older stars discovered with ROSAT (Alcala et al. 1995; Covino et a l. 1997). Altogether we present proper motions for 45 stars, taken fro m the Hipparcos, ACT and STARNET catalogues. For 12 stars of our sampl e parallaxes measured by Hipparcos are available, and we use them to d erive constraints on the distance distribution of the other stars in o ur sample. Our analysis of the proper motions allows us to divide the sample into several subgroups. We analyse the motions of the stars in connection with different star formation scenarios and find them consi stent with both the high velocity cloud (HVC) impact model (Lepine & D uvert 1994) and the cloudlet model (Feigelson 1996), whereas the data seem to be inconsistent with any kind of a dynamical ejection model.