X-RAY-SELECTED T-TAURI STARS IN THE CHAMELEON-I CLOUD

We report spectroscopy of 26 stars associated with 23 fields containin g proposed new X-ray-selected cloud members of Chamaeleon I. At least 13, and possibly as many as 19, of the stars are confirmed to be new ' weak-lined' T Tauri (WTT) stars due to the presence of Ha emission and strong lambda 6707 Li I absorption. Of the remainder, we suspect that five of the observed stars are not the X-ray emitters. Only two X-ray -emitting stars are found to be unrelated to the cloud. The available evidence suggests that the WTT stars are not systematically older than 'classical' T Tauri (CTT) stars in Chamaeleon. The transition between CTT and WTT stages for individual stars must range over most of the H ayashi track.