SIMBAD references

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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