Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010sf2a.conf..365k&link_type=abstract
SF2A-2010: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics. Eds.: S. Boissier, M. Heydari-
Astronomy and Astrophysics
Astrophysics
Galaxy: Evolution, Galaxy: Kinematics And Dynamics, Stars: Abundances, Methods: Observational
Scientific paper
A spectroscopic survey of nearly 600 stars probing the Galactic Thick Disc far from the Solar neighbourhood is performed. The MATISSE (MATrix Inversion for Spectral SynthEsis) algorithm is developed and trained in order to automatically obtain the atmospheric parameters of the stars. The derived effective temperatures, surface gravities and overall metallicities are then combined to stellar evolution isochrones, radial velocities and proper motions to get the distances, kinematics and orbital parameters of the sample stars, up to 8 kpc. The Galactic components Thin and Thick discs and Halo are then characterized. The velocity ellipsoid for the old Thin Disc is found at (σ_u, σ_v, σ_w)= (39,27,20) km s-1 with a mean [M/H] ˜ -0.12~dex, whereas the Thick Disc has a mean [M/H] ˜ -0.4~dex and a rotational lag of V ˜-76 km s-1
Bienayme Olivier
Bijaoui Albert
de Laverny Patrick
Gilmore Gerard
Helmi Amina
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