2004A&A...425..509A

Query : 2004A&A...425..509A

2004A&A...425..509A - Astronomy and Astrophysics, volume 425509-518 (2004/10-2)

VLT FORS-1 observations of NGC 6397: Evidence for mass segregation.

ANDREUZZI G., TESTA V., MARCONI G., ALCAINO G., ALVARADO F. and BUONANNO R.

Abstract (from CDS):

We present (V, V-I) VLT-FORS1 observations of the Galactic Globular Cluster NGC 6397. We derive accurate color-magnitude diagrams and luminosity functions (LFs) of the cluster Main Sequence (MS) for two fields extending from a region near the centre of the cluster out to ≃10'. The photometry of these fields produces a narrow MS extending down to V ≃27, much deeper than any previous ground based study on this system and comparable to previous HST photometry. The V, V-I CMD also shows a deep white dwarf cooling sequence locus, contaminated by many field stars and spurious objects. We concentrate the present work on the analysis of the MSLFs derived for two annuli at different radial distance from the center of the cluster. Evidence of a clear-cut correlation between the slope of the observed LFs before reaching the turn-over, and the radial position of the observed fields inside the cluster area is found. We find that the LFs become flatter with decreasing radius (x≃0.15 for 1'<R₁<5.5'; x≃0.24 for 5.5'<R₂<9.8' ; core radius, r_c=0.05'), a trend that is consistent with the interpretation of NGC 6397 as a dynamically relaxed system. This trend is also evident in the mass function.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: globular clusters: individual: NGC 6397 - stars: low-mass - stars: luminosity function, mass function

VizieR on-line data: <Available at CDS (J/A+A/425/509): catalog.dat>

Nomenclature: Catalog: Cl* NGC 6397 ATM NNNNNNN N=19228.

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

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 : 2004A&A...425..509A

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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