| Issue |
Astron. Astrophys. Suppl. Ser.
Volume 124, Number 3, September 1997
|
|
|---|---|---|
| Page(s) | 449 - 467 | |
| DOI | https://doi.org/10.1051/aas:1997202 | |
| Published online | 15 September 1997 | |
Search for young low-mass stars in a ROSAT selected sample south of the Taurus-Auriga molecular clouds *,**
1
Osservatorio Astrofisico di Catania, Città Universitaria, I-95125 Catania, Italy
2
Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain
3
Max-Planck-Institut für Extraterrestrische Physik, D-85740 Garching, Germany
4
Osservatorio Astronomico di Capodimonte, Via Moiariello 16, I-80131 Napoli, Italy
Received:
29
July
1996
Accepted:
3
December
1996
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 
square degree area. We identify 30 objects as low-mass PMS stars
on the basis of the Li i
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.
Key words: stars: formation / stars: late-type / stars: pre-main sequence / X-rays: stars
Based on observations made with the Isaac Newton Telescope operated on the island of La Palma by the Royal Greenwich Observatory in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias and with the ESO 1.52m telescope on La Silla, Chile, operated by the European Southern Observatory.
© European Southern Observatory (ESO), 1997