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A&A Supplement Ser., Vol. 124, September 1997, 449-467

Received July 29; accepted December 3, 1996

Search for young low-mass stars in a ROSAT selected sample south of the Taurus-Auriga molecular cloudsgif,

A. Magazzùtex2html_wrap1622 - E.L. Martíntex2html_wrap1624 - M.F. Sterziktex2html_wrap1626 - R. Neuhäusertex2html_wrap1626 - E. Covinotex2html_wrap1630 - J.M. Alcalátex2html_wrap1626

Send offprint request: A. Magazzù

tex2html_wrap1634  Osservatorio Astrofisico di Catania, Città Universitaria, I-95125 Catania, Italy
tex2html_wrap1636  Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain
tex2html_wrap1638  Max-Planck-Institut für Extraterrestrische Physik, D-85740 Garching, Germany
tex2html_wrap1640  Osservatorio Astronomico di Capodimonte, Via Moiariello 16, I-80131 Napoli, Italy


We present results of intermediate resolution spectroscopy of 131 optical counterparts to 115 ROSAT All-Sky Survey X-ray sources south of the Taurus-Auriga dark cloud complex. These objects have been selected as candidate young stars from a total of 1084 ROSAT sources in a tex2html_wrap_inline1608 square degree area. We identify 30 objects as low-mass PMS stars on the basis of the LiItex2html_wrap_inline1610 doublet in their spectrum, a signature of their young age. All these stars have a spectral type later than F7 and show spectral characteristics typical of weak-line and post-T Tauri stars. The presence of young objects several parsecs away from the regions of ongoing star formation is discussed in the light of the current models of T Tauri dispersal.

keywords: stars: formation -- stars: late-type -- stars: pre-main sequence -- X-rays: stars

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