2005PASP..117..245R

Query : 2005PASP..117..245R

2005PASP..117..245R - Publ. Astron. Soc. Pac., 117, 245-255 (2005/March-0)

Age and metallicity estimation of globular clusters from Stromgren photometry.

RAKOS K. and SCHOMBERT J.

Abstract (from CDS):

We present a new technique for the determination of age and metallicity in composite stellar populations using Strömgren filters. Using principal component (PC) analysis on multicolor models, we isolate the range of values necessary to uniquely determine age and metallicity effects. The technique presented here can only be applied to old (τ>3 Gyr) stellar systems composed of simple stellar populations, such as globular clusters and elliptical galaxies. Calibration using new photometry of 40 globular clusters with spectroscopic [Fe/H] values and main-sequence-fitted ages links the PC values to the Strömgren colors, for an accuracy of 0.2 dex in metallicity and 0.5 Gyr in age.Subject headings:

Abstract Copyright: ∼

Journal keyword(s): Galaxy: Globular Clusters: General

Simbad objects: 40

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Number of rows : 40
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
2 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 1130 0
3 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 1167 0
4 NGC 1261 GlC 03 12 16.21 -55 12 58.4     8.63     ~ 579 0
5 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1529 0
6 M 79 GlC 05 24 10.59 -24 31 27.3     8.16     ~ 883 0
7 NGC 2298 GlC 06 48 59.41 -36 00 19.1     8.89     ~ 547 0
8 NGC 3201 GlC 10 17 36.82 -46 24 44.9           ~ 1001 0
9 NGC 4147 GlC 12 10 06.149 +18 32 31.78   11.45 10.74     ~ 616 0
10 NGC 4372 GlC 12 25 45.43 -72 39 32.7   10.86 9.85     ~ 327 0
11 M 68 GlC 12 39 27.98 -26 44 38.6     7.96     ~ 1069 0
12 NGC 4833 GlC 12 59 33.92 -70 52 35.4           ~ 467 0
13 M 53 GlC 13 12 55.25 +18 10 05.4     7.79     ~ 907 0
14 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
15 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
16 NGC 5286 GlC 13 46 26.81 -51 22 27.3           ~ 485 0
17 NGC 5466 GlC 14 05 27.29 +28 32 04.0     9.70     ~ 887 0
18 NGC 5634 GlC 14 29 37.28 -05 58 35.1   10.69 10.05     ~ 333 0
19 NGC 5897 GlC 15 17 24.40 -21 00 36.4   10.16 8.52     ~ 424 0
20 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 2095 0
21 NGC 5986 GlC 15 46 03.00 -37 47 11.1     6.92     ~ 408 0
22 NGC 6101 GlC 16 25 48.12 -72 12 07.9           ~ 337 0
23 M 107 GlC 16 32 31.86 -13 03 13.6           ~ 835 0
24 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2291 0
25 NGC 6229 GlC 16 46 58.641 +47 31 36.38   9.38 9.86     ~ 397 0
26 M 12 GlC 16 47 14.18 -01 56 54.7     6.07     ~ 736 0
27 NGC 6352 GlC 17 25 29.11 -48 25 19.8           ~ 425 0
28 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 2103 0
29 NGC 6584 GlC 18 18 37.60 -52 12 56.8     8.17     ~ 317 0
30 NGC 6652 GlC 18 35 45.63 -32 59 26.6           ~ 474 0
31 M 22 GlC 18 36 23.94 -23 54 17.1           ~ 1459 0
32 M 70 GlC 18 43 12.76 -32 17 31.6           ~ 421 0
33 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1164 0
34 NGC 6723 GlC 18 59 33.15 -36 37 56.1           ~ 543 0
35 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
36 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 913 0
37 M 75 GlC 20 06 04.841 -21 55 20.14     8.26     ~ 394 0
38 M 72 GlC 20 53 27.70 -12 32 14.3     8.96     ~ 465 0
39 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
40 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 1114 1

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