2008A&A...491..767B


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.26CET02:55:52

2008A&A...491..767B - Astronomy and Astrophysics, volume 491, 767-780 (2008/12-1)

The old Galactic open clusters FSR 1716 and Czernik 23.

BONATTO C. and BICA E.

Abstract (from CDS):

Open clusters older than ∼4Gyr are rare in the Galaxy. Affected by a series of mass-decreasing processes, the stellar content of most open clusters dissolves into the field on a time-scale shorter than ∼1Gyr. In this sense, improving the statistics of old objects may provide constraints for a better understanding of the dynamical dissolution of open clusters. Our main purpose is to investigate the nature of the globular cluster candidate FSR 1716, located at l=329.8° and b=-1.6°. We also derive parameters of the anti-centre open cluster Czernik 23 (FSR 834). Both objects have been detected as stellar overdensities in the Froebrich, Scholz & Raftery (2007MNRAS.374..399F) star cluster candidate catalogue. The analyses are based on near-infrared colour-magnitude diagrams and stellar radial density profiles. The intrinsic colour-magnitude diagram morphology is enhanced by a field-star decontamination algorithm applied to the 2MASS J, H, and Ks photometry. Isochrone fits indicate that FSR 1716 is more probably an old (∼7Gyr) and absorbed (AV=6.3±0.2) open cluster, located ≃0.6kpc inside the solar circle in a contaminated central field. However, we cannot rule out the possibility of a low-mass, loose globular cluster. Czernik 23 is shown to be an almost absorption-free open cluster, ∼5 Gyrold, located about 2.5kpc towards the anti-centre. In both cases, solar and sub-solar ([Fe/H]~-0.5) metallicity isochrones represent equally well the stellar sequences. Both star clusters have a low mass content (≲200M) presently stored in stars. Their relatively small core and cluster radii are comparable to those of other open clusters of similar age. These structural parameters are probably a consequence of the several Gyr of mass loss due to stellar evolution, tidal interactions with the disk (and bulge in the case of FSR 1716), and possibly giant molecular clouds. Czernik 23, and especially FSR 1716, are rare examples of extreme dynamical survivors. The identification of both as such represents an increase of ≃10% in the known population of open clusters older than ∼4Gyr in the Galaxy.

Abstract Copyright:

Journal keyword(s): Galaxy: open clusters and associations: general - Galaxy: open clusters and associations: individual: FSR 1716 - Galaxy: open clusters and associations: individual: Czernik 23

Simbad objects: 21

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Number of rows : 21

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 188 OpC 00 48 26 +85 15.3           ~ 802 0
2 [FSR2007] 0584 OpC 02 27 15.0 +61 37 28           ~ 20 0
3 Cl Czernik 23 OpC 05 50 06 +28 54.0           ~ 15 0
4 NGC 2477 OpC 07 52 10 -38 31.8   6.64 5.8     ~ 254 0
5 NGC 2682 OpC 08 51 18 +11 48.0           ~ 1997 0
6 C 1206-626 OpC 12 09 45.0 -62 59 17           ~ 12 0
7 NAME Crux-Scutum Spiral Arm reg 12 30 -60.0           ~ 267 0
8 NGC 4755 OpC 12 53 39 -60 21.7           ~ 264 0
9 C 1353-269 GlC 13 56 21.1 -27 10 03           ~ 100 0
10 [FSR2007] 1716 OpC 16 10 33.0 -53 44 12           ~ 21 0
11 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1646 0
12 NAME 2MASS-GC03 GlC 16 52 12 -47 03.3           ~ 32 0
13 [FSR2007] 1755 OpC 17 12 20.0 -38 27 44           ~ 7 0
14 NAME 2MASS-GC04 OpC 17 35 44.8 -36 21 42           ~ 26 0
15 NGC 6397 GlC 17 40 42.09 -53 40 27.6   7.39 5.17     ~ 1768 1
16 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11178 0
17 M 16 OpC 18 18 48 -13 48.4   6.58 6.0     ~ 924 2
18 [FSR2007] 0089 OpC 18 48 39.0 -03 30 34           ~ 17 0
19 [FSR2007] 0190 OpC 20 05 31.3 +33 34 09           ~ 20 0
20 GCl 124 GlC 23 06 44.48 +12 46 19.2   15.6       ~ 225 1
21 NAME Galactic Bar reg ~ ~           ~ 846 0

    Equat.    Gal    SGal    Ecl

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2020.01.26-02:55:52

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