2007MNRAS.380..781S

Query : 2007MNRAS.380..781S

2007MNRAS.380..781S - Mon. Not. R. Astron. Soc., 380, 781-791 (2007/September-2)

The fraction of binary systems in the core of 13 low-density Galactic globular clusters.

SOLLIMA A., BECCARI G., FERRARO F.R., PECCI F.F. and SARAJEDINI A.

Abstract (from CDS):

We used deep observations collected with Advanced Camera for Surveys (ACS) at Hubble Space Telescope (HST) to derive the fraction of binary systems in a sample of 13 low-density Galactic globular clusters. By analysing the colour distribution of main-sequence stars we derived the minimum fraction of binary systems required to reproduce the observed colour-magnitude diagram morphologies. We found that all the analysed globular clusters contain a minimum binary fraction larger than 6 per cent within the core radius. The estimated global fractions of binary systems range from 10 to 50 per cent depending on the cluster. A dependence of the relative fraction of binary systems on the cluster age has been detected, suggesting that the binary disruption process within the cluster core is active and can significantly reduce the binary content in time.

Abstract Copyright: 2007 The Authors. Journal compilation © 2007 RAS

Journal keyword(s): stellar dynamics - methods: observational - techniques: photometric - binaries: general - stars: Population II - globular clusters: general

Simbad objects: 15

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Number of rows : 15
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 1130 0
2 M 68 GlC 12 39 27.98 -26 44 38.6     7.96     ~ 1069 0
3 NGC 5053 GlC 13 16 27.09 +17 42 00.9     9.96     ~ 675 0
4 NGC 5466 GlC 14 05 27.29 +28 32 04.0     9.70     ~ 887 0
5 NGC 5897 GlC 15 17 24.40 -21 00 36.4   10.16 8.52     ~ 424 0
6 NGC 6101 GlC 16 25 48.12 -72 12 07.9           ~ 337 0
7 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2240 0
8 NGC 6362 GlC 17 31 54.99 -67 02 54.0           ~ 637 0
9 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 2103 0
10 NGC 6723 GlC 18 59 33.15 -36 37 56.1           ~ 543 0
11 Cl Terzan 7 GlC 19 17 43.92 -34 39 27.8           ~ 460 0
12 Cl Arp 2 GlC 19 28 44.11 -30 21 20.3     12.41     ~ 384 0
13 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 913 0
14 M 72 GlC 20 53 27.70 -12 32 14.3     8.96     ~ 465 0
15 Cl Pal 12 GlC 21 46 38.84 -21 15 09.4     11.89     ~ 548 0

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