The STREGA survey. II. Globular Cluster Palomar 12
Abstract
In the framework of the STREGA (STRucture and Evolution of the GAlaxy) survey, two fields around the globular cluster Pal 12 were observed with the aim of detecting the possible presence of streams and/or an extended halo. The adopted stellar tracers are the Main Sequence, Turn-off and Red Giant Branch stars. We discuss the lumi- nosity function and the star counts in the observed region covering about 2 tidal radii, confirming that Pal 12 appears to be embedded in the Sagittarius Stream. Adopting an original approach to separate cluster and field stars, we do not find any evidence of sig- nificant extra-tidal Pal 12 stellar populations. The presence of the Sagittarius stream seems to have mimicked a larger tidal radius in previous studies. Indeed, adopting a King model, a redetermination of this value gives r_T = 0.22 +- 0.1 deg.
Keywords
Cite
@article{arxiv.1709.08509,
title = {The STREGA survey. II. Globular Cluster Palomar 12},
author = {I. Musella and M. Di Criscienzo and M. Marconi and G. Raimondo and V. Ripepi and M. Cignoni and G. Bono and E. Brocato and M. Dall'Ora and I. Ferraro and A. Grado and G. Iannicola and L. Limatola and R. Molinaro and M. I. Moretti and P. B. Stetson and M. Capaccioli and M. R. L. Cioni and F. Getman and P. Schipani},
journal= {arXiv preprint arXiv:1709.08509},
year = {2017}
}
Comments
13 pages, 17 figures, accepted for publication in MNRAS on 22 September 2017