Cool Stars 14 - Submitted Abstract # 172
This version created on 05 October 2006

Stellar X-ray sources as the diagnostic of local star formation
history


Alexis Klutsch, Observatoire Astronomique de Strasbourg
Patrick Guillout, Observatoire Astronomique de Strasbourg
Antonio Frasca, INAF - Osservatorio Astrofisico di Catania
Rubens Freire Ferrero, Observatoire Astronomique de Strasbourg
Ettore Marilli, INAF - Osservatorio Astrofisico di Catania
Beppe Mignemi, INAF - Osservatorio Astrofisico di Catania
Olivier Herent, Observatoire Astronomique de Strasbourg

An ongoing program, aimed at elucidating the nature and evolutionary
status of about 1000  late-type stellar X-ray sources in the field, is
presented.  The targets were selected as optical counterparts of ROSAT
All-Sky Survey (RASS) sources by means of the cross-correlation of
RASS and TYCHO catalogues.  High-resolution spectra of the RasTyc
sources, that has been obtained at Haute Provence and Catania
Observatories, allow us to derive fundamental stellar parameters such
as rotational and radial velocities, chromospheric activity,
metallicity, and Lithium abundance as well as to single out
spectroscopic binaries.  This large sample will enable us to
investigate the dependence of chromospheric and coronal activity on
stellar parameters and should provide further constraints to
theoretical Dynamo models.  The comparison of the space distribution
and kinematics of young stars with the predictions of the Besancon
stellar X-ray population model will enable us to address the question
of the galactic structure (scale height) and evolution (star formation
rate) in the solar neighborhood during the last billion years.


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