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

By G. Piotto, A. Milone, L. Bedin, Jay Anderson, Ivan R. King, A. Marino, D. Nardiello, A. Aparicio, B. Barbuy, Andrea Bellini and 33 more. 2014

380 citations recorded by the source corpus.

In this paper we describe a new UV-initiative Hubble Space Telescope project (GO-13297) that will complement the existing F606W and F814W database of the Advanced Camera for Surveys 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 this paper we will describe the database and our data reduction strategy, as well as the uses we intend to make of the final photometry, astrometry, and PMs. 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.

Subfields: Astronomy and Astrophysics, Electrical and Electronic Engineering, Instrumentation

View Paper: https://www.semanticscholar.org/paper/5e5343bcb63d9465914daa3d99e58fb30f4b4940

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In Astronomy and Astrophysics

1. Jay Anderson
2. G. Piotto
3. A. Milone
4. L. Bedin
5. F. D’Antona
6. A. Renzini
7. Santi Cassisi
8. A. Marino

In Electrical and Electronic Engineering

1. A. Sarajedini
2. Jay Anderson
3. J. Brinchmann
4. P. Ventura
5. A. Renzini
6. F. D’Antona

In Instrumentation

1. Jay Anderson
2. G. Piotto
3. A. Milone
4. L. Bedin
5. F. D’Antona
6. A. Renzini
7. Santi Cassisi
8. A. Aparicio

Citations in the corpus

• The Updated BaSTI Stellar Evolution Models and Isochrones. I. Solar-scaled Calculations (2018, background): “Metal mixtures appropriate to study the multiple populations phenomenon in globular clusters (see, Gratton et al. 2012; Cassisi & Salaris 2013; Piotto et al. 2015, and references therein) will be presented in future publications.”
• The Hubble Space Telescope UV Legacy Survey of Galactic globular clusters – IX. The Atlas of multiple stellar populations (2016, methodology): “The results of our paper are based on the masses obtained by fitting the modls by Wilson (1975) on the profiles of 63 Galactic GCs by Trager et al. (1995).”
• The Hubble Space TelescopeUV Legacy Survey of Galactic Globular Clusters – V. Constraints on formation scenarios (2015, methodology): “Again, c© 0000 RAS, MNRAS000, 000–000 the same argument for the excess helium can be spent for the oxygen depletion: SMSs do produce helium and destroy oxygen, but a few×104 M⊙ SMS is simply not massive enough to produce helium enhancements and oxygen depletions on the scale that is observed in 2G s”
• A stellar census in globular clusters with MUSE: multiple populations chemistry in NGC 2808 (2019, background): “Milone et al. (2017) presented the chromosome maps of the 57 clusters included in their HST UV Legacy Survey of Galactic GCs (HUGS; Piotto et al. 2015) and showed that, for the majority of their clusters, the RGB stars can be easily divided into two main groups, which they refer to as first (1G)…”