Kinematic study of six galactic old open clusters

J. F. GÓNZALEZ; ANALIA V SMITH CASTELLI; JUAN PABLO CASO; ANDRÉS E. PIATTI

Tandil

Encuentro; Reunion Anual de la Asociacion Argentina de Astronomia; 2013

Instituto de Astronomía y Física del Espacio

We present Gemini GMOS spectroscopic observations of 134 stars 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. We determined the mean cluster radial velocity and analyzed kinematic membership for all clusters except Tr 5, for which there is no clear accumulation point in the radial velocity distribution. A double lined spectroscopic binary was detected in Be 32. The typical error in our mean cluster velocities is 0.5 km/s . The accuracy achieved in individual measurement of low rotating stars demonstrates the capability of GMOS for obtaining radial velocities with uncertainties of 1.5-2.0 km/s.