Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998larm.confe..81t&link_type=abstract
"IX Latin American Regional IAU Meeting, "Focal Points in Latin American Astronomy", held in Tonantzintla, Mexico, Nov 9-13, 199
Astronomy and Astrophysics
Astronomy
Scientific paper
The existence of T Tauri stars (TTS) isolated from clouds has been proposed in the V RRLA ( Quast et al. 1987). This lead us to discover the first group of very isolated TTS around the high galactic latitude TTS TW Hya ( de la Reza et al.; 1989 and Gregorio Hetem et al.; 1992). X-ray data from ROSAT may be used to identify new TTS and investigate if these TTS form indeed isolated groups or if they are homougeneously distributed in the solar neighborhood. We selected X-ray sources in five areas of 10x10 deg containing possible optical counterparts in the GSC up to V ~ 14. Three areas were selected around the isolated TTS Hen1, TW Hya and V4046 Sgr. Two other control areas were choosen outside the Galactic plane, away from any known TTS. Using the 1.52 m telescope under the ON/ESO agreement we found new TTS only in the areas containing the already known isolated TTS. There are now at least 6 TTS around Hen 1, seven around TW Hya and five around V 4046 Sgr. Such distribution is statistically very improbable. We discuss here the reality of these groups, their ages and their rates of duplicity.
da Silva Loureiro L.
de La Reza Ramiro
Quast Germano R.
Torres Carlos A. O.
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