Kinematic study of six galactic old open clusters

GONZÁLEZ, J. F.; SMIDTH-CASTELLI, A. V.; CASO, J. P.; PIATTI, A. E.

Tandil

Congreso; Reunión Anual de la Asociación Argentina de Astronomía; 2013

Instituto de Astronomía y Física del Espacio

We present Gemini GMOS spectroscopic observations of 134stars in the field of 6 old (2-8 Gyr) open clusters in the third galactic quadrant:Be 32, Be 39, NGC 2112, NGC 2243, NGC 2682, and Tr 5. Wedetermined the mean cluster radial velocity and analyzed kinematic membershipfor all clusters except Tr 5, for which there is no clear accumulationpoint in the radial velocity distribution. A double lined spectroscopicbinary was detected in Be 32. The typical error in our mean cluster velocitiesis 0.5 kms−1. The accuracy achieved in individual measurementof low rotating stars demonstrates the capability of GMOS for obtainingradial velocities with uncertainties of 1.5-2.0 kms−1.