T-TAURI STARS AND THE GOULD BELT NEAR LUPUS

We present results of a study to investigate the spatial distribution of X-ray active young stellar objects near the Lupus star forming regi on (SFR). In this SFR, a recent study has led to the discovery of some 130 new weak-line T Tauri stars (WTTS) dispersed over a large area of some 230 square degrees. However, the true extent of the spatial dist ribution of these stars could not be determined in this study. We have selected from the ROSAT All-Sky-Survey candidate T Tauri stars within a narrow strip of 100 width, Located adjacent to the Lupus SFR, and o riented perpendicular to the galactic plane. Intermediate resolution s pectroscopy was carried out to identify stellar objects with strong Li I lambda 6708 absorption, indicative of their youth, and 48 Li-rich s tars were found within our study region. The peak at b similar or equa l to 18 degrees in the spatial distribution of Li-rich stars within th is strip corresponds well with the intersection of our study region wi th the Gould Belt, but is inconsistent with the assumption that these stars belong to a galactic ZAMS foreground population, which would be expected to be centered on the galactic midplane. We conclude that the majority of recently discovered low-mass, X-ray active, Li-rich stars dispersed over large areas around Gould Belt SFRs are indeed WTTS wit h ages not exceeding that of the Gould Belt itself, i.e. below 5 - 6 x 10(7) years.