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THE HUBBLE SPACE TELESCOPE UV LEGACY SURVEY OF GALACTIC GLOBULAR CLUSTERS. I. OVERVIEW OF THE PROJECT AND DETECTION OF MULTIPLE STELLAR POPULATIONS

Piotto, G and Milone, AP and Bedin, LR and Anderson, J and King, IR and Marino, AF and Nardiello, D and Aparicio, A and Barbuy, B and Bellini, A and Brown, TM and Cassisi, S and Cool, AM and Cunial, A and Dalessandro, E and D'Antona, F and Ferraro, FR and Hidalgo, S and Lanzoni, B and Monelli, M and Ortolani, S and Renzini, A and Salaris, M and Sarajedini, A and van der Marel, RP and Vesperini, E and Zoccali, M (2015) THE HUBBLE SPACE TELESCOPE UV LEGACY SURVEY OF GALACTIC GLOBULAR CLUSTERS. I. OVERVIEW OF THE PROJECT AND DETECTION OF MULTIPLE STELLAR POPULATIONS. ASTRONOMICAL JOURNAL, 149 (3). pp. 149-191. ISSN 0004-6256

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Abstract

In this paper we describe a new UV-initiative HST project (GO-13297) that will complement the existing F606W and F814W database of the ACS Globular Cluster (GC) Treasury by imaging most of its clusters through UV/blue WFC3/UVIS filters F275W, F336W and F438W. This "magic trio" of filters has shown an uncanny ability to disentangle and characterize multiple-population (MP) patterns in GCs in a way that is exquisitely sensitive to C, N, and O abundance variations. Combination of these passbands with those in the optical also gives the best leverage for measuring helium enrichment. The dozen clusters that had previously been observed in these bands exhibit a bewildering variety of MP patterns, and the new survey will map the full variance of the phenomenon. The ubiquity of multiple stellar generations in GCs has made the formation of these cornerstone objects more intriguing than ever; GC formation and the origin of their MPs have now become one and the same problem. In the present paper we will describe the data base and our data reduction strategy, as well as the uses we intend to make of the final photometry, astrometry, and proper motions. We will also present preliminary color-magnitude diagrams from the data so far collected. These diagrams also draw on data from GO-12605 and GO-12311, which served as a pilot project for the present GO-13297.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: IOP PUBLISHING LTD
Related URLs:
Date Deposited: 03 Mar 2016 11:12
Last Modified: 03 Mar 2016 11:12
DOI or Identification number: 10.1088/0004-6256/149/3/91
URI: http://researchonline.ljmu.ac.uk/id/eprint/3056

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