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|Title:||Proper Motions in Terzan 5: Membership of the Multi-iron Subpopulations and First Constraint on the Orbit||Authors:||Massari, D.
Ferraro, F. R.
Rich, R. M.
|Issue Date:||2015||Journal:||THE ASTROPHYSICAL JOURNAL||Number:||810||Issue:||1||First Page:||69||Abstract:||By exploiting two sets of high-resolution images obtained with the Hubble Space Telescope Advanced Camera for Surveys/Wide Field Channel over a baseline of ∼10 years, we have measured relative proper motions (PMs) of ∼70,000 stars in the stellar system Terzan 5. The results confirm the membership of the three subpopulations with different iron abundances discovered in the system. The orbit of the system has been derived from a first estimate of its absolute PM, obtained by using bulge stars as a reference. The results of the integration of this orbit within an axisymmetric Galactic model exclude any external accretion origin for this cluster. Terzan 5 is known to have chemistry similar to the Galactic bulge; our findings support a kinematic link between the cluster and the bulge, further strengthening the possibility that Terzan 5 is the fossil remnant of one of the pristine clumps that originated the bulge. <P />Based on observations (GO12933, GO9799) with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS 5-26555.||Acknowledgments:||We thank the anonymous referee for his or her useful comments that helped us to improve our paper. The authors are also grateful to Dr. Lucie Jílková for her valuable suggestions on the cluster orbit integration. This research is part of the project Cosmic-Lab (website: http://www.cosmic-lab.eu ) funded by the European Research Council (under contract ERC-2010-AdG-267675). D.M. thanks the Kapteyn Astronomical Institute for hospitality. R.M.R. acknowledges support from AST-1413755 from the National Science Foundation. The techniques applied in the present work have been developed in the context of the HSTPROMO collaboration 7 7 For details see the HSTPROMO home page at http://www.stsci.edu/marel/hstpromo.html (Bellini et al. 2014 ; van der Marel et al. 2014 ), which aims to improve our understanding of the dynamical evolution of stars, stellar clusters, and galaxies in the nearby universe through the measurement and interpretation of PMs.||URI:||http://hdl.handle.net/20.500.12386/24031||URL:||https://iopscience.iop.org/article/10.1088/0004-637X/810/1/69||ISSN:||0004-637X||DOI:||10.1088/0004-637X/810/1/69||Bibcode ADS:||2015ApJ...810...69M||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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