Probing mass segregation in the globular cluster NGC 6397

被引：10

作者：

Martinazzi, E. ^{[1
]}

Pieres, A. ^{[1
]}

Kepler, S. O. ^{[1
]}

Costa, J. E. S. ^{[1
]}

Bonatto, C. ^{[1
]}

Bica, E. ^{[1
]}

机构：

[1] Univ Fed Rio Grande do Sul, Inst Fis, BR-91501900 Porto Alegre, RS, Brazil

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2014年 / 442卷 / 04期

关键词：

globular clusters: individual: NGC 6397; Galaxy: structure; SURFACE-BRIGHTNESS PROFILES; DEEP ADVANCED CAMERA; STAR-CLUSTERS; MILKY-WAY; LUMINOSITY FUNCTION; DYNAMICAL MODELS; NGC-6397; CATALOG; EVAPORATION; PARAMETERS;

D O I：

10.1093/mnras/stu1032

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In this study, we present a detailed study of mass segregation in the globular cluster NGC 6397. First, we carry out a photometric analysis of projected European Southern Observatory (ESO)-Very Large Telescope (VLT) data (between 1 and 10 arcmin from the cluster centre), presenting the luminosity function corrected by completeness. The luminosity function shows a higher density of bright stars near the central region of the data with respect to the outer region. We calculate a deprojected model (covering the whole cluster), estimating a total number of 193 000 +/- 19 000 stars. The shapes of the surface brightness and density-number profiles versus the radial coordinate r (instead of the projected coordinate R) lead to a decreasing luminosity and thus mass for an average star, up to 1 arcmin, quantifying the mass segregation. The deprojected model does not show evidence of mass segregation outside this region.

引用

页码：3105 / 3111

页数：7

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