2012MNRAS.425.2872H

Query : 2012MNRAS.425.2872H

2012MNRAS.425.2872H - Mon. Not. R. Astron. Soc., 425, 2872-2879 (2012/October-1)

A direct N-body model of core-collapse and core oscillations.

HURLEY J.R. and SHARA M.M.

Abstract (from CDS):

We report on the results of a direct N-body simulation of a star cluster that started with N=200000, comprising 195 000 single stars and 5000 primordial binaries. The code used for the simulation includes stellar evolution, binary evolution, an external tidal field and the effects of two-body relaxation. The model cluster is evolved to 12 Gyr, losing more than 80 per cent of its stars in the process. It reaches the end of the main core-collapse phase at 10.5 Gyr and experiences core oscillations from that point onwards - direct numerical confirmation of this phenomenon. However, we find that after a further 1 Gyr the core oscillations are halted by the ejection of a massive binary comprised of two black holes from the core, producing a core that shows no signature of the prior core-collapse. We also show that the results of previous studies with N ranging from 500 to 100 000 scale well to this new model with larger N. In particular, the time-scale to core collapse (in units of the relaxation time-scale), mass segregation, velocity dispersion and the energies of the binary population all show similar behaviour at different N.

Journal keyword(s): methods: numerical - binaries: close - stars: evolution - stars: kinematics and dynamics - globular clusters: general - galaxies: star - clusters: general

Simbad objects: 1

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Number of rows : 1

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 6397	GlC	17 40 42.09	-53 40 27.6			5.17			~	2103	0

Query : 2012MNRAS.425.2872H

Basic data :

NGC 6397 -- Globular Cluster

GlC (2013A&A,GCl), Cl* (C,[KPS2012])

17 40 42.09 -53 40 27.6 (Optical) [ ] D 2010AJ....140.1830G

17 36 37.84 -53 38 53.5 [ ]

338.16501 -11.95952 [ ]

3.30 -17.60 [0.01 0.01 90] C 2019MNRAS.482.5138B

V(km/s) 18.4 [0.1] / z(spectroscopic) 0.000061 [0.000000] / cz 18.40 [0.10] (Opt) A 2018MNRAS.478.1520B

0.416 [0.010] C 2021MNRAS.505.5978V

25.7 25.7 90 (Opt) D 1989Sci...246.1066D

V 5.17 [~] D 2012AJ....144..126D

K 3.29 [~] D 2008MNRAS.389.1924F

z (AB) 5.450 [0.044] C 2014MNRAS.437.1725V

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NGC 6397 C 1736-536 GCl 74 [KPS2012] MWSC 2662

References (2103 between 1850 and 2026) (Total 2103)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).

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