Star-density Profiles of Six Old Star Clusters in the Large Magellanic Cloud

被引：27

作者：

Lanzoni, Barbara ^{[1
,2
]}

Ferraro, Francesco R. ^{[1
,2
]}

Dalessandro, Emanuele ^{[2
]}

Cadelano, Mario ^{[1
,2
]}

Pallanca, Cristina ^{[1
,2
]}

Raso, Silvia ^{[1
,2
]}

Mucciarelli, Alessio ^{[1
,2
]}

Beccari, Giacomo ^{[3
]}

Focardi, Paola ^{[1
]}

机构：

[1] Univ Bologna, Dipartimento Fis & Astron, I-40129 Bologna, Italy

[2] Ist Nazl Astrofis INAF, Osservatorio Astrofis & Sci Spazio Bologna, Via Gobetti 93-3, I-40129 Bologna, Italy

[3] European So Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany

来源：

ASTROPHYSICAL JOURNAL | 2019年 / 887卷 / 02期

关键词：

BLUE STRAGGLER STARS; SURFACE BRIGHTNESS PROFILES; GALACTIC GLOBULAR-CLUSTERS; STRUCTURAL PARAMETERS; HST OBSERVATIONS; MILKY-WAY; CORE; MASS; POPULATION; CATALOG;

D O I：

10.3847/1538-4357/ab54c2

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We used resolved star counts from Hubble Space Telescope (HST) images to determine the center of gravity and the projected density profiles of six old globular clusters (GCs) in the Large Magellanic Cloud (LMC), namely NGC 1466, NGC 1841, NGC 1898, NGC 2210, NGC 2257, and Hodge 11. For each system, the LMC field contribution was properly taken into account by making use, when needed, of parallel HST observations. The derived values of the center of gravity may differ by several arcseconds (corresponding to more dal 1 pc at the distance of the LMC) from previous determinations. The cluster density profiles are all well fit by King models, with structural parameters that may differ from the literature ones by even factors of two. Similar to what was observed for Galactic GCs, the ratio between the effective and the core radius has been found to anticorrelate with the cluster dynamical age.

引用

页数：11

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