2001AJ....122.2569B

Query : 2001AJ....122.2569B

2001AJ....122.2569B - Astron. J., 122, 2569-2586 (2001/November-0)

Age as the second parameter in NGC 288/NGC 362? I. Turnoff ages: a purely differential comparison.

BELLAZZINI M., PECCI F.F., FERRARO F.R., GALLETI S., CATELAN M. and LANDSMAN W.B.

Abstract (from CDS):

We present deep V, I photometry of the globular clusters NGC 288, 362, and 1851 obtained during a single observational run under strictly homogeneous conditions. We use the bimodal horizontal branch (HB) of NGC 1851 as a ``bridge'' to obtain the optimum relative match between the HBs of NGC 288 and NGC 362. In this way we can effectively remove the uncertainties associated with distance, reddening, and inhomogeneities in the absolute calibration, thus obtaining a very robust, purely differential estimate of the age difference between these two clusters. According to the bridge test, NGC 288 is found to be older than NGC 362 by 2±1 Gyr. This result is fully confirmed also by all classical differential age diagnostics, either based on the luminosity (ΔVHBTO) or color [δ(V-I)@2.5] of the main-sequence turnoff point.

Abstract Copyright: ∼

Journal keyword(s): Stars: Color-Magnitude Diagrams - Galaxy: Globular Clusters: General - Galaxy: Globular Clusters: Individual: NGC Number: NGC 288 - Galaxy: Globular Clusters: Individual: NGC Number: NGC 362 - Galaxy: Globular Clusters: Individual: NGC Number: NGC 1851 - Stars: Horizontal-Branch - Stars: Population II

VizieR on-line data: <Available at CDS (J/AJ/122/2569): table1.dat table2.dat table3.dat>

Nomenclature: Table 1: Cl* NGC 288 BPF NNNNN (Nos 1-10990). Table 2: Cl* NGC 1851 BPF NNNN (Nos 1-9118). Table 3: Cl* NGC 362 BPF NNNN (Nos 1-7492).

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 26

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Number of rows : 26
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 Cl* NGC 288 BPF 34 RR* 00 52 40.2673332768 -26 32 29.446936440   15.59 14.42     ~ 7 0
2 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 1130 0
3 Cl* NGC 288 BPF 35 RR* 00 52 46.6865967768 -26 34 08.079458016   15.4 15.7     ~ 13 0
4 OGLE SMC724.15.000502 RR* 01 02 46.6474430448 -70 51 16.887473316     15.217   14.805 ~ 9 0
5 OGLE SMC724.15.000494 RR* 01 02 58.1749429752 -70 51 23.849604468     15.50   15.06 ~ 14 0
6 OGLE SMC724.15.000432 RR* 01 03 07.6659852240 -70 52 49.430043516     15.46   14.82 ~ 14 0
7 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 1167 0
8 OGLE SMC724.15.000622 RR* 01 03 17.7148165224 -70 50 17.185748748     15.346   14.928 ~ 9 0
9 Cl* NGC 362 MJ 8241 * 01 03 25.0 -70 51 55   15.51 15.39     ~ 2 0
10 NGC 362 2066 * 01 03 26.2361431182 -70 52 12.891396749   16.23 16.04     ~ 5 0
11 OGLE SMC-RRLYR-6472 RR* 01 03 31.3713598944 -70 50 41.819718696     15.52   14.900 ~ 13 0
12 OGLE SMC-RRLYR-6473 RR* 01 03 32.6815099296 -70 53 19.820538564     16.26   14.433 ~ 14 0
13 OGLE SMC724.14.000093 RR* 01 03 40.4836129872 -70 51 18.808820136     15.54   14.91 ~ 14 0
14 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1529 0
15 Cl* NGC 1851 W 654 RR* 05 14 09.75 -40 03 10.4   16.480 16.082     ~ 3 0
16 Cl* NGC 1851 W 702 RR* 05 14 09.9008095104 -40 02 12.063430752   16.404 16.039     ~ 11 0
17 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
18 Cl* NGC 1851 W 626 * ~ ~   16.343 16.118     ~ 5 0
19 Cl* NGC 1851 W 647 * ~ ~   16.328 16.111     ~ 5 0
20 Cl* NGC 1851 W 919 * ~ ~   16.412 16.084     ~ 2 0
21 Cl* NGC 1851 W 703 * ~ ~   16.489 16.127     ~ 5 0
22 Cl* NGC 1851 W 586 * ~ ~   16.307 16.054     ~ 5 0
23 Cl* NGC 1851 W 710 * ~ ~   16.18 15.91     ~ 5 0
24 Cl* NGC 1851 W 688 * ~ ~   16.28 16.03     ~ 6 0
25 Cl* NGC 1851 W 544 * ~ ~   16.295 16.067     ~ 6 0
26 Cl* NGC 1851 W 505 * ~ ~   16.148 15.851     ~ 4 0

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