The STREGA survey. II. Globular Cluster Palomar 12
I. Musella, M. Di Criscienzo, M. Marconi, G. Raimondo, V. Ripepi, M., Cignoni, G. Bono, E. Brocato, M. Dall'Ora, I. Ferraro, A. Grado, G., Iannicola, L. Limatola, R. Molinaro, M. I. Moretti, P. B. Stetson, M., Capaccioli, M.R.L. Cioni, F. Getman, and P. Schipani
TL;DR
This study investigates the stellar populations around globular cluster Pal 12, confirming its embedding in the Sagittarius Stream and refining its tidal radius, while finding no significant extra-tidal stars.
Contribution
The paper introduces an original method to distinguish cluster and field stars, clarifies the influence of the Sagittarius Stream, and provides a revised tidal radius for Pal 12.
Findings
Pal 12 is embedded in the Sagittarius Stream.
No significant extra-tidal stellar populations detected.
Revised tidal radius of Pal 12 is 0.22 ± 0.1 degrees.
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.
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