The chemical composition of the low-mass Galactic globular cluster NGC 6362

被引：32
作者：
Massari, D. [1 ,2 ,3 ]
Mucciarelli, A. [3 ,4 ]
Dalessandro, E. [3 ,4 ]
Bellazzini, M. [3 ]
Cassisi, S. [5 ]
Fiorentino, G. [3 ]
Ibata, R. A. [6 ]
Lardo, C. [7 ]
Salaris, M. [7 ]
机构：
[1] Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands
[2] Univ Groningen, Kapteyn Astron Inst, NL-9747 AD Groningen, Netherlands
[3] INAF, Osservatorio Astron Bologna, Via Ranzani 1, I-40127 Bologna, Italy
[4] Univ Bologna, Dipartimento Fis & Astron, Vle Berti Pichat 6-2, I-40127 Bologna, Italy
[5] INAF, Osservatorio Astron Teramo, Via M Maggini, I-64100 Teramo, Italy
[6] Univ Strasbourg, CNRS, UMR 7550, Observ Astron Strasbourg, 11 Rue Univ, F-67000 Strasbourg, France
[7] Liverpool John Moores, Astrophys Res Inst, IC2,Liverpool Sci Pk,146 Brownlow Hill, Liverpool L3 5RF, Merseyside, England
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2017年 / 468卷 / 01期
基金：
欧洲研究理事会;
关键词：
techniques: spectroscopic; stars: abundances; globular clusters: individual: (NGC 6362); STAR ABUNDANCE VARIATIONS; MULTIPLE STELLAR POPULATIONS; MILKY-WAY SATELLITES; GIANT BRANCH STARS; METAL-POOR STARS; UV LEGACY SURVEY; 47; TUCANAE; BRIGHT GIANTS; FIELD STARS; S-ELEMENTS;
D O I：
10.1093/mnras/stx549
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present chemical abundances for 17 elements in a sample of 11 red giant branch stars in NGC 6362 from UVES spectra. NGC 6362 is one of the least massive globulars where multiple populations have been detected, yet its detailed chemical composition has not been investigated so far. NGC 6362 turns out to be a metal-intermediate ([Fe/H] = -1.07 +/- 0.01 dex) cluster, with its alpha-peak and Fe-peak elements content compatible with that observed in clusters with similar metallicity. It also displays an enhancement in its s-process element abundances. Among the light elements involved in the multiple populations phenomenon, only [Na/Fe] shows star-to-star variations, while [Al/Fe] and [Mg/Fe] do not show any evidence for abundance spreads. A differential comparison with M4, a globular cluster with similar mass and metallicity, reveals that the two clusters share the same chemical composition. This finding suggests that NGC 6362 is indeed a regular cluster, formed from gas that has experienced the same chemical enrichment of other clusters with similar metallicity.
引用
收藏
页码：1249 / 1258
页数：10
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