H-1525 Budapest, P.O. Box 67, Hungary
e-mail: kun@konkoly.hu
2Onsala Space Observatory
S-439 92 Onsala, Sweden
e-mail: silvana@oso.chalmers.se
Abstract:
During a spectroscopic survey performed with the Nordic Optical Telescope
in La Palma we found five classical T Tauri stars in the small, high
latitude molecular clouds associated with the reflection nebula IC2118.
The star-forming clouds are located at the outer boundary
of the Orion star forming region, at a mean galactic
latitude of -28°. Their positions in space and cometary shapes
suggest their interaction with the Orion SFR. Using spectroscopic
and near-infrared photometric data we determined the positions
of the newly discovered pre-main sequence stars in the HRD. Comparison of the
results
with evolutionary models has shown that the masses of these stars are
between 0.3-0.8Msun and their ages are close to
106 yrs.
They are roughly coeval and significantly younger than the known WTTS of
the same region. We conclude that the birth of the molecular
clouds and the stars was probably induced by the interaction of
the Orion--Eridanus Bubble
with some small, diffuse high-latitude HI clouds.
