2000AJ....120.1853D


Query : 2000AJ....120.1853D

2000AJ....120.1853D - Astron. J., 120, 1853-1875 (2000/October-0)

A near-infrared photometric survey of metal-poor inner spheroid globular clusters and nearby bulge fields.

DAVIDGE T.J.

Abstract (from CDS):

Images recorded through J, H, K, 2.2 µm continuum, and CO filters have been obtained of a sample of metal-poor ([Fe/H]≤-1.3) globular clusters in the inner spheroid of the Galaxy. The shape and color of the upper giant branch on the (K, J-K) color-magnitude diagram (CMD), combined with the K brightness of the giant branch tip, are used to estimate the metallicity, reddening, and distance of each cluster. CO indices are used to identify bulge stars, which will bias metallicity and distance estimates if not culled from the data. The distances and reddenings derived from these data are consistent with published values, although there are exceptions. The reddening-corrected distance modulus of the Galactic center, based on the Carney et al. horizontal-branch (HB) brightness calibration, is estimated to be 14.9±0.1. The mean upper giant branch CO index shows cluster-to-cluster scatter that (1) is larger than expected from the uncertainties in the photometric calibration and (2) is consistent with a dispersion in CNO abundances comparable to that measured among halo stars. The luminosity functions (LFs) of upper giant branch stars in the program clusters tend to be steeper than those in the halo clusters NGC 288, NGC 362, and NGC 7089. The majority of inner spheroid clusters fall along the integrated J-K versus metallicity relation defined by halo clusters; however, many of the inner spheroid clusters do not follow the relation between integrated CO index and metallicity measured for halo clusters, in that they have CO indices that are too small. Bulge fields were also observed near most clusters. The slope of the giant branch LF does not vary significantly between most fields, although the LFs in Baade's window and near NGC 6273 are significantly shallower than average. Metallicities estimated from the slope of the upper giant branch on the (K, J-K) CMDs of fields within 6° of the Galactic center are consistent with previous studies. Finally, the data suggest that the HB content may not be uniform throughout the bulge, in the sense that a larger than average number of red HB stars may occur in fields closest to the Galactic center.

Abstract Copyright:

Journal keyword(s): Galaxy: Center - Galaxy: Structure - Galaxy: Globular Clusters: General - infrared: radiation - Stars: Horizontal-Branch - Stars: Late-Type

Simbad objects: 31

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Number of rows : 31
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     ~ 3747 0
2 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 991 0
3 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 1019 0
4 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2384 0
5 M 80 GlC 16 17 02.41 -22 58 33.9           ~ 673 0
6 NGC 6144 GlC 16 27 13.86 -26 01 24.6   10.55 9.63     ~ 226 0
7 NGC 6139 GlC 16 27 39.987 -38 50 57.03   11.03 9.68     ~ 196 0
8 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2115 0
9 NGC 6235 GlC 16 53 25.36 -22 10 38.8   11.99 7.20     ~ 174 0
10 M 19 GlC 17 02 37.69 -26 16 04.6   8.45 5.57     ~ 345 1
11 NGC 6284 GlC 17 04 28.747 -24 45 51.22   10.72 7.43     ~ 262 0
12 NGC 6287 GlC 17 05 09.4906767360 -22 42 28.099250172   11.49 10.30     ~ 210 0
13 NGC 6293 GlC 17 10 10.42 -26 34 54.2   9.96 9.02     ~ 260 0
14 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2006 0
15 M 9 GlC 17 19 11.78 -18 30 58.5   9.36 8.42     ~ 299 0
16 NGC 6355 GlC 17 23 58.65 -26 21 12.3   12.46 11.05     ~ 142 0
17 ESO 455-11 GlC 17 31 05.20 -29 58 54.0           ~ 155 0
18 ESO 455-23 GlC 17 35 47.80 -30 28 11.0           ~ 225 0
19 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13179 0
20 NAME cl Djorgovski 1 GlC 17 47 28.30 -33 03 56.0           ~ 69 0
21 NGC 6453 GlC 17 50 51.77 -34 35 55.1   10.49       ~ 152 0
22 NGC 6522 GlC 18 03 34.08 -30 02 02.3   10.68 9.48     ~ 498 1
23 NGC 6541 GlC 18 08 02.36 -43 42 53.6   8.06 7.32     ~ 350 1
24 NGC 6558 GlC 18 10 18.38 -31 45 48.6   12.39 11.29     ~ 210 0
25 M 28 GlC 18 24 32.89 -24 52 11.4           ~ 725 0
26 NGC 6642 GlC 18 31 54.23 -23 28 34.1   11.30 10.24     ~ 184 0
27 M 22 GlC 18 36 23.94 -23 54 17.1   7.16 6.17     ~ 1304 0
28 M 70 GlC 18 43 12.76 -32 17 31.6   9.76 9.06     ~ 357 0
29 NGC 6717 GlC 18 55 06.04 -22 42 05.3   11.29 10.35     ~ 224 0
30 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 972 1
31 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 986 0

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2022.09.26-07:35:49

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