Properties of Stellar Populations of Eight Galactic Global Clusters with Low Central Surface Brightness

Astronomy Reports - This paper presents the results of the analysis of the integrated-light spectra of eight Galactic globular clusters with a relatively low luminosity and stellar density: Palomar...     

The Stellar Population and Orbit of the Galactic Globular Cluster Palomar 3

Deep stellar photometry of one of the most distant Galactic globular clusters, Palomar 3, based on frames taken with the VLT in Johnson–Cousins broadband V and I filters is presented, together with medium-resolution stellar spectroscopy in the central region of the cluster obtained with the CARELEC spectrograph of the Observatoire de Haute Provence and measurements of the Lick spectral indices for the integrated spectrum. Computations of the orbital parameters of Palomar 3 and nine Galactic globular clusters with similar metallicities and ages are also presented. The orbital parameters, age, metallicity, and distance of Palomar 3 are estimated. The interstellar absorption is consistent with and supplements values fromthe literature. The need to obtainmore accurate data on the propermotions, ages, and chemical compositions of the cluster stars to elucidate the origin of this globular cluster is emphasized.