Exploring the nature and synchronicity of early cluster formation in the Large Magellanic Cloud - V. Multiple populations in ancient globular clusters

被引：3

作者：

Gilligan, Christina K. ^{[1
]}

Chaboyer, Brian ^{[1
]}

Cummings, Jeffrey D. ^{[2
]}

Mackey, Dougal ^{[3
]}

Cohen, Roger E. ^{[4
]}

Geisler, Douglas ^{[5
,6
,7
]}

Grocholski, Aaron J. ^{[8
]}

Parisi, M. C. ^{[9
]}

Sarajedini, Ata ^{[10
]}

Ventura, Paolo ^{[11
]}

Villanova, Sandro ^{[5
]}

Yang, Soung-Chul ^{[12
]}

Wagner-Kaiser, Rachel ^{[13
]}

机构：

[1] Dartmouth Coll, Dept Phys & Astron, Hanover, NH 03784 USA

[2] Johns Hopkins Univ, Ctr Astrophys Sci, 3400 N Charles St, Baltimore, MD 21218 USA

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

[4] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA

[5] Univ Concepcion, Dept Astron, Casilla 160-C, Concepcion, Chile

[6] Univ La Serena, Inst Invest Multidisciplinario Ciencia & Tecnol, Ave Raul Bitran S-N, La Serena, Chile

[7] Univ La Serena, Dept Astron, Fac Ciencias, Av Juan Cisternas 1200, La Serena 1700000, Chile

[8] Amer Univ, Dept Phys, Washington, DC 20016 USA

[9] Univ Nacl Cordoba, Observ Astron, Laprida 854, RA-5000 Cordoba, Argentina

[10] Florida Atlantic Univ, 777 Glades Rd,SE-43,Room 256, Boca Raton, FL 33431 USA

[11] INAF Osservatotio Astron Roma, Via Frascati 33, I-00078 Rome, Italy

[12] Korea Astron & Space Sci Inst, Daejeon 305348, South Korea

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

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2020年 / 494卷 / 02期

基金：

澳大利亚研究理事会;

关键词：

Magellanic Clouds; galaxies: star clusters: individual: (NGC 1466; NGC; 1841; 2257; Reticulum); UV LEGACY SURVEY; STELLAR POPULATIONS; MAIN-SEQUENCE; SEARCH; PHOTOMETRY; AGE; II; IV;

D O I：

10.1093/mnras/staa822

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We examine four ancient Large Magellanic Cloud (LMC) globular clusters (GCs) for evidence of multiple stellar populations using the Advanced Camera for Surveys and Wide Field Camera 3 on the Hubble Space Telescope Programme GO-14164. NGC 1466, NGC 1841, and NGC 2257 all show evidence for a redder, secondary population along the main sequence. Reticulum does not show evidence for the presence of a redder population, but this GC has the least number of stars and Monte Carlo simulations indicate that the sample of main-sequence stars is too small to robustly infer whether a redder population exists in this cluster. The second, redder, population of the other three clusters constitutes similar to 30 - 40 per cent of the total population along the main sequence. This brings the total number of ancient LMC GCs with known split or broadened main sequences to five. However, unlike for Hodge 11 and NGC 2210 (see Gilligan et al. (2019)), none of the clusters shows evidence for multiple populations in the horizontal branch. We also do not find evidence of a second population along the red giant branch.

引用

页码：1946 / 1955

页数：10