NEW T-TAURI STARS IN CHAMELEON-I AND CHAMELEON-II

A new objective prism survey of the entire Chamaeleon I dark cloud and two-thirds of the Chamaeleon II cloud taken using a CCD detector with the Schmidt telescope at CTIO has uncovered 26 new Halpha emission line objects that were missed by previous Ha plate surveys. The new Ha emission line objects have similar infrared colors and spatial distributions to the known T Tauri stars in these dark clouds, and could represent the very low mass end of the stellar population in these clouds or an older, less active component to the usual classical T Tauri star population. The present survey increases the total number of known young stars in both clouds by about 20%, a substantial increase important for studies of the initial mass function in these clouds. The new Ha survey identified 70% of the total known YSOs in Cha I, compared with 35% for IRAS, and 25% from the Einstein x-ray survey. Ten of the new objects are weak-lined stars, with Halpha equivalent widths less than 10 angstrom. Overall, weak-lined T Tauri stars make up about half of the total population of young stars in the Chamaeleon I cloud, similar to the fraction of weak-lined stars known in the Taurus-Auriga cloud. Presented are coordinates, finding charts, and optical and infrared photometry of the new emission-line objects.