Exploring the nature and synchronicity of early cluster formation in the Large Magellanic Cloud IV. Evidence for multiple populations in Hodge 11 and NGC 2210

被引：17

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, Weston, 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 4030000, Chile

[6] Univ La Serena, Inst Invest Multidisciplinario Ciencia & Tecnol, Ave Raul Bitran S-N, La Serena 1700000, Chile

[7] Univ La Serena, Fac Ciencias, Dept Fis & Astron, Ave 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] Osserv Astron Roma, INAF, Via Frascati 33, I-00078 Rome, Italy

[12] Korea Astron & Space Sci Inst KASI, 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 | 2019年 / 486卷 / 04期

基金：

澳大利亚研究理事会;

关键词：

Magellanic Clouds -galaxies: star clusters: individual (Hodge 11; NGC 2210); GALACTIC GLOBULAR-CLUSTERS; STELLAR POPULATIONS; ACS SURVEY; CHEMICAL-COMPOSITION; MAIN-SEQUENCE; SEARCH; AGE; PHOTOMETRY; BRANCH; II;

D O I：

10.1093/mnras/stz1174

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a multiple population search in two old Large Magellanic Cloud (LMC) Globular clusters, Hodge 11 and NGC 2210. This work uses data from the Advanced Camera for Surveys and Wide Field Camera 3 on the Hubble Space Telescope from programme GO 14164 in Cycle 23. Both of these clusters exhibit a broadened main sequence with the second population representing (20 5) per cent for NGC 2210 and (30 5) per cent for 'lodge 11. In both clusters, the smaller population is redder than the primary population. suggesting CNO variations. Hodge 11 also displays a bluer second population in the horizontal branch, which is evidence for helium enhancement. However, even though NGC 2210 shows similarities to Hodge 11 in the main sequence, there does not appear to be a second population on NGC 2210's horizontal branch. This is the firs( photometric evidence that ancient I AMC Globular clusters exhibit multiple stellar populations.

引用

页码：5581 / 5599

页数：19

共 9 条

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Chaboyer, Brian
Cummings, Jeffrey D.
Mackey, Dougal
Cohen, Roger E.
Geisler, Douglas
Grocholski, Aaron J.
Parisi, M. C.
Sarajedini, Ata
Ventura, Paolo
Villanova, Sandro
Yang, Soung-Chul
Wagner-Kaiser, Rachel
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