The Hubble Space Telescope UV Legacy Survey of Galactic globular clusters - XXI. Binaries among multiple stellar populations

被引：0

作者：

Milone, A. P. ^{[1
,2
]}

Vesperini, E. ^{[3
]}

Marino, A. F. ^{[1
,2
,4
]}

Hong, J. ^{[3
,5
]}

van der Marel, R. ^{[6
,7
]}

Anderson, J. ^{[6
]}

Renzini, A. ^{[2
]}

Cordoni, G. ^{[1
]}

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

Bellini, A. ^{[6
]}

Brown, T. M. ^{[6
]}

D'Antona, F. ^{[8
]}

Lagioia, E. P. ^{[1
]}

Libralato, M. ^{[6
]}

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

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

Tailo, M. ^{[1
]}

Cool, A. ^{[9
]}

Salaris, M. ^{[10
]}

Sarajedini, A. ^{[11
]}

机构：

[1] Univ Padua, Dipartimento Fis & Astron Galileo Galilei, Vicolo Osservatorio 3, I-35122 Padua, Italy

[2] Ist Nazl Astrofis, Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy

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

[4] Ctr Ateneo Studi & Attivita Spaziali Giuseppe Col, Via Venezia 15, I-35131 Padua, Italy

[5] Yonsei Univ, Dept Astron, 50 Yonsei Ro, Seoul, South Korea

[6] Space Telescope Sci Inst, 3800 San Martin Dr, Baltimore, MD 21218 USA

[7] Johns Hopkins Univ, Dept Phys & Astron, Ctr Astrophys Sci, Baltimore, MD 21218 USA

[8] Ist Nazl Astrofis, Osservatorio Astron Roma, Via Frascati 33, I-00040 Rome, Italy

[9] San Francisco State Univ, Dept Phys & Astron, 1600 Holloway Ave, San Francisco, CA 94132 USA

[10] Liverpool John Moores Univ, Astrophys Res Inst, Liverpool Sci Pk,IC2 Bldg,146 Brownlow Hill, Liverpool L3 5RF, Merseyside, England

[11] Univ Florida, Dept Astron, 211 Bryant Space Sci Ctr, Gainesville, FL 32611 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2020年 / 492卷 / 04期

基金：

欧洲研究理事会; 欧盟地平线“2020”;

关键词：

techniques: photometric; stars: abundances; tars: Population II; globular clusters: general; STARS; EVOLUTION; CATALOG;

D O I：

10.1093/mnras/staz3629

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A number of scenarios for the formation of populations in globular clusters (GCs) predict that second generation (2G) stars form in a compact and dense subsystem embedded in a more extended first-generation (1G) system. If these scenarios are accurate, a consequence of the denser 2G formation environment is that 2G binaries should be more significantly affected by stellar interactions and disrupted at a larger rate than 1G binaries. The fractions and properties of binary stars can thus provide a dynamical fingerprint of the formation epoch of multiple -population GCs and their subsequent dynamical evolution. We investigate the connection between binaries and multiple populations in five GCs, NGC 288, NGC 6121 (M 4), NGC 6352, NGC 6362, and NGC 6838 (M 71). To do this, we introduce a new method based on the comparison of Hubble Space Telescope observations of binaries in the F275W, F336W, F438W, F606W, and F814W filters with a large number of simulated binaries. In the inner regions probed by our data, we do not find large differences between the local 1G and the 2G binary incidences in four of the studied clusters, the only exception being M4 where the 1G binary incidence is about three times larger than the 2G incidence. The results found are in general agreement with the results of simulations predicting significant differences in the global 1G and 2G incidences and in the local values in the clusters' outer regions but similar incidences in the inner regions. The significant difference found in M4 is consistent with simulations with a larger fraction of wider binaries. Our analysis also provides the first evidence of mixed (1G -2G) binaries, a population predicted by numerical simulations to form in a cluster's inner regions as a result of stellar encounters during which one component of a binary is replaced by a star of a different population.

引用

页码：5456 / 5469

页数：13