2011A&A...535A..33M


Query : 2011A&A...535A..33M

2011A&A...535A..33M - Astronomy and Astrophysics, volume 535A, 33-33 (2011/11-1)

Three galactic globular cluster candidates.

MONI BIDIN C., MAURO F., GEISLER D., MINNITI D., CATELAN M., HEMPEL M., VALENTI E., VALCARCE A.A.R., ALONSO-GARCIA J., BORISSOVA J., CARRARO G., LUCAS P., CHENE A.-N., ZOCCALI M. and KURTEV R.G.

Abstract (from CDS):

The census of Galactic globular clusters (GCs) is still incomplete, and about ten new objects are supposed to await discovery, hidden behind the crowded and reddened regions of the Galactic bulge and disk. We investigated the nature of three new GC candidates, discovered in the frames collected by the Vista Variables in the Via Lactea (VVV) near-infrared survey. They will be called VVV CL002, VVV CL003, and VVV CL004. We studied the results of point-spread-function near-infrared photometry from VVV data for the three objects and their surrounding fields, the proper motion information available in the literature and, when possible, we derived the cluster parameters by means of calibrated indices measured on the color-magnitude diagrams. The evidence shows that VVV CL002 is a newly discovered, small, moderately metal-rich ([Fe/H]≃-0.4) Galactic GC. It is located at a Galactocentric distance of 0.7±0.9kpc, and it could be one of the nearest GC to the Galactic center. Its characteristics are more similar to those of low-mass, Palomar-like GCs than to more classical, old, and massive bulge GCs. VVV CL003 is the first star cluster discovered in the Galactic disk on the opposite side of the center with respect to the Sun, at a Galactocentric distance of ∼5kpc. Its high metallicity ([Fe/H]≃-0.1) and location point to an open cluster, but a GC cannot be excluded. VVV CL004, on the contrary, is most probably only a random clump of field stars, as indicated by both its low statistical significance and by the impossibility to distinguish its stars from the surrounding field population. We claim the detection of i) a new Galactic GC, deriving an estimate of its basic parameters; ii) a stellar aggregate, probably an open cluster, in the disk directly beyond the Galactic center; and iii) an overdensity of stars, most probably an asterism.

Abstract Copyright:

Journal keyword(s): surveys - globular clusters: individual: VVV CL002 - globular clusters: individual: VVV CL003 - clusters: general globular

Nomenclature: Table 1: VVV CLNNN N=3 (Nos CL002, CL003, CL004).

Simbad objects: 20

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Number of rows : 20
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3737 0
2 NAME Whiting 1 GlC 02 02 56.8 -03 15 10           ~ 132 0
3 [FSR2007] 0584 OpC 02 27 15.0 +61 37 28           ~ 21 0
4 Cl Pal 1 GlC 03 33 20.04 +79 34 51.8   17.2       ~ 224 1
5 NGC 1901 OpC 05 18 15 -68 17.6           ~ 86 0
6 NAME CVn II dSph G 12 57 09.6 +34 19 12     16.1     ~ 233 2
7 ESO 455-11 GlC 17 31 05.20 -29 58 54.0           ~ 154 0
8 Liller 1 Cl* 17 33 24.50 -33 23 20.0           ~ 232 0
9 NAME 2MASS-GC04 OpC 17 35 44.8 -36 21 42           ~ 28 0
10 VVV CL003 Cl? 17 38 54.56 -29 54 25.3           ~ 8 0
11 VVV CL002 GlC 17 41 06.30 -28 50 42.3           ~ 13 0
12 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13094 0
13 VVV CL004 ? 17 54 31.91 -22 13 37.8           ~ 3 0
14 VVV CL001 Gl? 17 54 42.5 -24 00 53           ~ 22 0
15 NAME PWM 2 GlC 17 58 39 -05 04.3           ~ 13 0
16 NGC 6528 GlC 18 04 49.61 -30 03 20.8   12.12 10.65     ~ 500 0
17 NAME Mercer 5 Cl* 18 23 19.800 -13 40 07.00           ~ 19 0
18 [FSR2007] 0190 OpC 20 05 31.3 +33 34 09           ~ 21 0
19 Cl Pal 12 GlC 21 46 38.84 -21 15 09.4     11.89     ~ 491 0
20 NAME Galactic Bulge reg ~ ~           ~ 3898 0

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2022.08.15-15:54:42

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