2014A&A...563A...5S


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.18CEST09:31:59

2014A&A...563A...5S - Astronomy and Astrophysics, volume 563A, 5-5 (2014/3-1)

On the relation between metallicity and RGB color in HST/ACS data.

STREICH D., DE JONG R.S., BAILIN J., GOUDFROOIJ P., RADBURN-SMITH D. and VLAJIC M.

Abstract (from CDS):

The determination of stellar metallicity and its gradient in external galaxies is a difficult task, but crucial for the understanding of galaxy formation and evolution. The color of the Red Giant Branch (RGB) can be used to determine metallicities of stellar populations that have only shallow photometry. We will quantify the relation between metallicity and color in the widely used HST/ACS filters F606W and F814W. We use a sample of globular clusters from the ACS Globular Cluster Survey and measure their RGB color at given absolute magnitudes to derive the color-metallicity relation. We especially investigate the scatter and the uncertainties in this relation and show its limitations. There is a clear relation between metallicity and RGB color. A comparison with isochrones shows reasonably good agreement with BaSTI models, a small offset to Dartmouth models, and a larger offset to Padua models. Even for the best globular cluster data available, the metallicity of a simple stellar population can be determined from the RGB alone only with an accuracy of 0.3dex for [M/H]≲-1, and 0.15dex for [M/H]>-1. For mixed populations, as they are observed in external galaxies, the uncertainties will be even larger due to uncertainties in extinction, age, etc. Therefore caution is necessary when interpreting photometric metallicities.

Abstract Copyright:

Journal keyword(s): stars: Population II - globular clusters: general - galaxies: stellar content

Simbad objects: 59

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Number of rows : 59

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3463 0
2 NGC 362 GlC 01 03 14.26 -70 50 55.6   7.97 6.58     ~ 892 0
3 NGC 1261 GlC 03 12 16.21 -55 12 58.4   9.79 8.63     ~ 402 0
4 Cl Pal 2 GlC 04 46 05.91 +31 22 53.4   15       ~ 137 0
5 NGC 1851 GlC 05 14 06.76 -40 02 47.6   8.80 7.23     ~ 1206 0
6 NGC 2298 GlC 06 48 59.41 -36 00 19.1   10.77 8.89     ~ 407 0
7 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 784 0
8 IRAS 09110-6439 GlC 09 12 03.10 -64 51 48.6   7.77 5.69     ~ 1200 0
9 NGC 3201 GlC 10 17 36.82 -46 24 44.9   9.18 8.24     ~ 684 0
10 C 1235-509 GlC 12 38 40.20 -51 09 01.0           ~ 305 0
11 M 68 GlC 12 39 27.98 -26 44 38.6   10.26 7.96     ~ 854 0
12 NGC 4833 GlC 12 59 33.92 -70 52 35.4   8.72 7.79     ~ 330 0
13 M 53 GlC 13 12 55.25 +18 10 05.4   8.95 7.79     ~ 687 0
14 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 2908 0
15 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2223 0
16 NGC 5286 GlC 13 46 26.81 -51 22 27.3   9.18 8.31     ~ 342 0
17 IC 4499 GlC 15 00 18.57 -82 12 49.6     8.56     ~ 297 0
18 M 5 GlC 15 18 33.22 +02 04 51.7   7.34 5.95     ~ 1722 0
19 NGC 5927 GlC 15 28 00.69 -50 40 22.9   10.13 8.86     ~ 387 0
20 NGC 5986 GlC 15 46 03.00 -37 47 11.1     6.92     ~ 291 0
21 Cl Lynga 7 GlC 16 11 03.65 -55 19 04.0           ~ 83 0
22 M 80 GlC 16 17 02.41 -22 58 33.9           ~ 592 0
23 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1631 0
24 NGC 6101 GlC 16 25 48.12 -72 12 07.9   10.90 10.08     ~ 222 0
25 NGC 6144 GlC 16 27 13.86 -26 01 24.6   10.55 9.63     ~ 189 0
26 M 107 GlC 16 32 31.86 -13 03 13.6   9.96 8.85     ~ 680 0
27 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 1967 0
28 M 12 GlC 16 47 14.18 -01 56 54.7   8.52 6.07     ~ 555 0
29 M 10 GlC 16 57 09.05 -04 06 01.1     4.98     ~ 653 0
30 NGC 6304 GlC 17 14 32.25 -29 27 43.3   10.33 9.03     ~ 279 0
31 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 1864 0
32 NGC 6362 GlC 17 31 54.99 -67 02 54.0   9.72 8.86     ~ 459 0
33 NGC 6388 GlC 17 36 17.461 -44 44 08.34   7.40       ~ 771 1
34 NGC 6426 GlC 17 44 54.71 +03 10 12.5           ~ 180 0
35 NGC 6441 GlC 17 50 13.06 -37 03 05.2   9.26 8.00     ~ 739 0
36 NGC 6496 GlC 17 59 03.68 -44 15 57.4   9.96       ~ 168 0
37 NGC 6541 GlC 18 08 02.36 -43 42 53.6   8.06 7.32     ~ 301 1
38 NGC 6584 GlC 18 18 37.60 -52 12 56.8   10.32 8.17     ~ 229 0
39 NGC 6624 GlC 18 23 40.51 -30 21 39.7           ~ 751 1
40 M 69 GlC 18 31 23.10 -32 20 53.1   9.32 8.31     ~ 391 1
41 NGC 6652 GlC 18 35 45.63 -32 59 26.6   10.64 9.75     ~ 335 1
42 M 22 GlC 18 36 23.94 -23 54 17.1   7.16 6.17     ~ 1174 0
43 M 70 GlC 18 43 12.76 -32 17 31.6   9.76 9.06     ~ 308 0
44 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 855 0
45 NGC 6717 GlC 18 55 06.04 -22 42 05.3   11.29 10.35     ~ 181 0
46 NGC 6723 GlC 18 59 33.15 -36 37 56.1           ~ 408 0
47 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1763 0
48 M 56 GlC 19 16 35.57 +30 11 00.5   8.90       ~ 344 0
49 Cl Arp 2 GlC 19 28 44.11 -30 21 20.3     12.41     ~ 286 0
50 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 731 0
51 Cl Terzan 8 GlC 19 41 44.41 -33 59 58.1     11.54     ~ 241 0
52 M 71 GlC 19 53 46.49 +18 46 45.1   7.91 6.1     ~ 996 0
53 NGC 6934 GlC 20 34 11.37 +07 24 16.1   10.48 9.75     ~ 346 0
54 M 72 GlC 20 53 27.70 -12 32 14.3   9.95 8.96     ~ 352 0
55 NGC 7006 GlC 21 01 29.465 +16 11 16.49     10.46     ~ 473 0
56 M 15 GlC 21 29 58.33 +12 10 01.2   3       ~ 2842 0
57 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 857 1
58 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 879 0
59 NAME Local Group GrG ~ ~           ~ 6660 0

    Equat.    Gal    SGal    Ecl

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2019.10.18-09:31:59

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