Cool Stars 14 - Submitted Abstract # 177
This version created on 05 October 2006

High resolution spectroscopic analysis of cool stars possible members
of nearby young moving groups


David Montes, Universidad Complutense de Madrid UCM
Javier Lopez-Santiago, Universidad Complutense de Madrid UCM & Obs.
 Palermo Italy
Ines Crespo-Chacon, Universidad Complutense de Madrid UCM
Raquel Martínez-Arnaiz, Universidad Complutense de Madrid UCM
Jesus Maldonado, Universidad Complutense de Madrid UCM & Universidad
 Autonoma de Madrid UAM

In this contribution we present a detailed spectroscopic analysis of
several late-type stars possible members of some nearby young moving
groups like AB Doradus, Hercules-Lyra, Tucana-Horologium and Beta Pic.
We have used high resolution echelle spectroscopic observations taken
with the FEROS spectrograph at the 2.2m telescope from ESO.  We have
determined precise radial and rotational velocities, the chromospheric
activity level using the information provided for several optical
spectroscopic features (from the Ca II H & K to Ca II IRT lines), and
the Li I 6707.8A line equivalent width (EW).  With all this
information we have added new constraints to the membership of these
stars by applying kinematic criteria (position of the stars in the
velocity space (U, V, W), deviation of the proper motion of the star
from the convergent point and comparison between the observed and
calculated radial velocities), as well as age-dating methods, such as
the chromospheric activity level and the comparison of the EW of the
lithium line with that obtained for well-known clusters.  An
additional estimation of the age has been obtained from isochrone
fitting on the color-magnitude diagrams.

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