2001AJ....122.3219R

Query : 2001AJ....122.3219R

2001AJ....122.3219R - Astron. J., 122, 3219-3230 (2001/December-0)

CCD photometry of the classic second-parameter globular clusters M3 and M13.

REY S.-C., YOON S.-J., LEE Y.-W., CHABOYER B. and SARAJEDINI A.

Abstract (from CDS):

We present high-precision V, B-V color-magnitude diagrams (CMDs) for the classic second-parameter globular clusters M3 and M13 from wide-field, deep CCD photometry. The data for the two clusters were obtained during the same photometric nights with the same instrument, allowing us to determine accurate relative ages. Based on a differential comparison of the CMDs using the Δ(B-V) method, an age difference of 1.7±0.7 Gyr is obtained between these two clusters. We compare this result with our updated horizontal-branch (HB) population models, which confirm that the observed age difference can produce the difference in HB morphology between the clusters. This provides further evidence that age is the dominant second parameter that influences HB morphology.

Abstract Copyright: ∼

Journal keyword(s): Stars: Color-Magnitude Diagrams - globular clusters: individual (M3, M13) - Stars: Evolution - Stars: Horizontal-Branch

VizieR on-line data: <Available at CDS (J/AJ/122/3219): table1.dat table2.dat>

Nomenclature: Table 1: Cl* NGC 5272 RYL NNNN (Nos 1-2170, 5001-5186). Table 2: Cl* NGC 6205 RYL NNNN (Nos 1-1730, 5001-5424).

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

Simbad objects: 9

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Number of rows : 9
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 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 1130 0
2 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 1167 0
3 NAME Eridanus Star Cluster GlC 04 24 44.5 -21 11 13           ~ 192 1
4 NAME Sextans C GlC 10 05 30.96 +00 04 15.4   15.5 13.9     ~ 354 1
5 GCl 17 GlC 11 29 16.80 +28 58 25.0   14.4       ~ 379 1
6 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
7 GCl 38 GlC 16 10 59.00 +14 57 42.0           ~ 399 0
8 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2291 0
9 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 1114 1

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