2015AJ....150..176C


Query : 2015AJ....150..176C

2015AJ....150..176C - Astron. J., 150, 176 (2015/December-0)

Wide field near-infrared photometry of 12 galactic globular clusters: observations versus models on the red giant branch.

COHEN R.E., HEMPEL M., MAURO F., GEISLER D., ALONSO-GARCIA J. and KINEMUCHI K.

Abstract (from CDS):

We present wide field near-infrared (near-IR) photometry of 12 Galactic globular clusters, typically extending from the tip of the cluster red giant branch (RGB) to the main sequence turnoff. Using recent homogenous values of cluster distance, reddening and metallicity, the resulting photometry is directly compared to the predictions of several recent libraries of stellar evolutionary models. Of the sets of models investigated, Dartmouth and Victoria-Regina models best reproduce the observed RGB morphology, albeit with offsets in J-KS color which vary in their significance in light of all sources of observational uncertainty. Therefore, we also present newly recalibrated relations between near-IR photometric indices describing the upper RGB versus cluster iron abundance as well as global metallicity. The influence of enhancements in alpha elements and helium are analyzed, and we find that the former affect the morphology of the upper RGB in accord with model predictions. Meanwhile, the empirical relations we derive are in good agreement with previous results, and minor discrepancies can likely be attributed to differences in the assumed cluster distances and reddenings. In addition, we present measurements of the horizontal branch (HB) and RGB bump magnitudes, finding a non-negligible dependence of the near-IR HB magnitude on cluster metallicity. Lastly, we discuss the influence of assumed cluster distances, reddenings and metallicities on our results, finding that our empirical relations are generally insensitive to these factors to within their uncertainties.

Abstract Copyright:

Journal keyword(s): globular clusters: general - globular clusters: individual: (NGC 104, NGC 288, NGC 362, NGC 1261, NGC 1851, NGC 2808, NGC 4833, NGC 5927, NGC 6304, NGC 6496, NGC 6584, NGC 7099) - infrared: stars

VizieR on-line data: <Available at CDS (J/AJ/150/176): table3.dat table4.dat>

Simbad objects: 18

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Number of rows : 18
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3661 0
2 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 958 0
3 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 980 0
4 NGC 1261 GlC 03 12 16.21 -55 12 58.4     8.63     ~ 451 0
5 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1294 0
6 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1297 0
7 NGC 3201 GlC 10 17 36.82 -46 24 44.9           ~ 768 0
8 NGC 4833 GlC 12 59 33.92 -70 52 35.4   8.72 7.79     ~ 372 0
9 NGC 5927 GlC 15 28 00.69 -50 40 22.9   10.13 8.86     ~ 421 0
10 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1726 0
11 NGC 6304 GlC 17 14 32.25 -29 27 43.3   10.33 9.03     ~ 315 0
12 NGC 6496 GlC 17 59 03.68 -44 15 57.4   9.96       ~ 193 0
13 NGC 6528 GlC 18 04 49.61 -30 03 20.8   12.12 10.65     ~ 485 0
14 NGC 6584 GlC 18 18 37.60 -52 12 56.8   10.32 8.17     ~ 257 0
15 NGC 6723 GlC 18 59 33.15 -36 37 56.1           ~ 451 0
16 NGC 6791 OpC 19 20 53 +37 46.3   10.52 9.5     ~ 918 0
17 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 954 0
18 NAME Galactic Bulge reg ~ ~           ~ 3662 0

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2021.09.28-18:13:57

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