Metallicity
and radial velocity of the second parameter globular cluster Terzan 1 in the
galactic bulge «
T.P. Idiart, B.
Barbuy, M.-N. Perrin, S. Ortolani, E. Bica, A. Renzini
Terzan
1 is the globular cluster with closest projection relative to the Galactic
center. We report radial velocities and metallicities of 17 stars in order to
investigate their membership in the cluster. From the 11 probable members of
Terzan 1, a radial velocity of vr = 114±14 km s-1 is obtained. For this
sample an intermediate metallicity of [Fe/H] ~ -1.3 is found, in agreement with
previous work based on HST Colour-Magnitude Diagrams.
« Observations collected
at the European Southern Observatory, ESO, Chile, Laboratório Nacional de Astrofísica,
LNA, Brazil and with the Hubble Space Telescope