Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...473..143d&link_type=abstract
Astronomy and Astrophysics, Volume 473, Issue 1, October I 2007, pp.143-148
Astronomy and Astrophysics
Astrophysics
11
Stars: Carbon, Stars: Kinematics, Galaxy: Disk, Galaxy: Kinematics And Dynamics
Scientific paper
Context: The availability, from 2MASS, of a large homogeneous sample of Galactic C stars and the recognition that their absolute magnitude can be accurately determined offer the possibility to use them as kinematical probes to investigate motions in the thin or thick disks. Aims: Determine the radial velocities for 70 C stars, a few degrees from the Galactic plane and distributed in longitudes from 60° to 220°. Methods: Spectra, with a resolution of 4300, were obtained with the DAO 1.8 m telescope during 6 beautiful nights in October 2006. Results: The rotation velocities of C stars with 60° < ℓ < 150° suggest a flat rotation curve to 15 kpc. A number of stars have velocities that do not fit the thin disk rotation. Some of them, toward ℓ = 200° are most probably members of the Canis Major overdensity. Conclusions: Effort should be made to extend the rotation curve to more that 20 kpc.
Full Tables 1 and 4 are only available in electronic form at http://www.aanda.org
Battinelli Paolo
Demers Serge
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