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

被引：422

作者：

Piotto, G. ^{[1
,2
]}

Milone, A. P. ^{[3
]}

Bedin, L. R. ^{[2
]}

Anderson, J. ^{[4
]}

King, I. R. ^{[5
]}

Marino, A. F. ^{[3
]}

Nardiello, D. ^{[1
,2
]}

Aparicio, A. ^{[6
,7
]}

Barbuy, B. ^{[8
]}

Bellini, A. ^{[4
]}

Brown, T. M. ^{[3
]}

Cassisi, S. ^{[9
]}

Cool, A. M. ^{[10
]}

Cunial, A. ^{[2
]}

Dalessandro, E. ^{[11
]}

D'Antona, F. ^{[12
]}

Ferraro, F. R. ^{[11
]}

Hidalgo, S. ^{[6
,7
]}

Lanzoni, B. ^{[11
]}

Monelli, M. ^{[6
,7
]}

Ortolani, S. ^{[1
,2
]}

Renzini, A. ^{[2
]}

Salaris, M. ^{[2
]}

Sarajedini, A. ^{[13
]}

van der Marel, R. P. ^{[14
]}

Vesperini, E. ^{[4
,15
]}

Zoccali, M. ^{[16
,17
]}

机构：

[1] Univ Padua, Dipartimento Fis & Astron Galileo Galilei, I-35122 Padua, Italy

[2] INAF, Osservatorio Astron Padova, I-35122 Padua, Italy

[3] Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia

[4] Space Telescope Sci Inst, Baltimore, MD 21218 USA

[5] Univ Washington, Dept Astron, Seattle, WA 98195 USA

[6] Inst Astrofis Canarias, E-38200 Tenerife, Canary Islands, Spain

[7] Univ La Laguna, Dept Astrophys, E-38200 Tenerife, Canary Islands, Spain

[8] Univ Sao Paulo, IAG, BR-05508900 Sao Paulo, Brazil

[9] Osservatorio Astron Teramo, I-64100 Teramo, Italy

[10] San Francisco State Univ, Dept Phys & Astron, San Francisco, CA 94132 USA

[11] Univ Bologna, Dipartimento Fis & Astron, I-40127 Bologna, Italy

[12] INAF, Osservatorio Astron Roma, I-00040 Rome, Italy

[13] Liverpool John Moores Univ, Astrophys Res Inst, Liverpool L3 5RF, Merseyside, England

[14] Univ Florida, Dept Astron, Gainesville, FL 32611 USA

[15] Indiana Univ, Dept Astron, Bloomington, IN 47405 USA

[16] Pontificia Univ Catolica Chile, Inst Astrofis, Santiago 4860, Chile

[17] Millennium Inst Astrophys, Santiago 4860, Chile

来源：

ASTRONOMICAL JOURNAL | 2015年 / 149卷 / 03期

基金：

欧洲研究理事会; 澳大利亚研究理事会;

关键词：

globular clusters: general; Hertzsprung-Russell and C-M diagrams; proper motions; stars: Population II; HORIZONTAL-BRANCH STARS; NA-O ANTICORRELATION; DOUBLE MAIN-SEQUENCE; EARLY DISC ACCRETION; SODIUM-OXYGEN ANTICORRELATION; COLOR-MAGNITUDE DIAGRAMS; MASS BLACK-HOLE; OMEGA-CENTAURI; NGC; 2808; MILLISECOND PULSAR;

D O I：

10.1088/0004-6256/149/3/91

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页数：28

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