2008MNRAS.389.1470H

Query : 2008MNRAS.389.1470H

2008MNRAS.389.1470H - Mon. Not. R. Astron. Soc., 389, 1470-1478 (2008/September-3)

An assessment of broad-band optical colours as age indicators for star clusters.

HANCOCK M., SMITH B.J., GIROUX M.L. and STRUCK C.

Abstract (from CDS):

We present an empirical assessment of the use of broad-band optical colours as age indicators for unresolved extragalactic clusters and investigate stochastic sampling effects on integrated colours. We use the integrated properties of Galactic open clusters (OCs) as models for unresolved extragalactic clusters. The population synthesis code Starburst99 (SB99) and four optical colours were used to estimate how well we can recover the ages of 62 well-studied Galactic OCs with published ages. We provide a method for estimating the ages of unresolved clusters and for reliably determining the uncertainties in the age estimates. Our results support earlier conclusions based on comparisons to synthetic clusters, namely the (U - B) colour is critical to the estimation of the ages of star-forming regions. We compare the observed optical colours with those obtained from SB99 using the published ages and get good agreement. The scatter in the (B - V)observed- (B - V)model is larger for lower luminosity clusters, perhaps due to stochastic effects.

Abstract Copyright: © 2008 The Authors. Journal compilation © 2008 RAS

Journal keyword(s): methods: data analysis - open clusters and associations: general - galaxies: star clusters - galaxies: stellar content

Simbad objects: 46

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Number of rows : 46
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 Berkeley 2 OpC 00 25 16.4 +60 23 33           ~ 37 0
2 NGC 129 OpC 00 30 25.8 +60 12 44   7.33 6.5     ~ 216 0
3 Cl Trumpler 1 OpC 01 35 40.1 +61 17 09   8.35 8.1     ~ 108 0
4 NGC 744 OpC 01 58 37.4 +55 29 04   8.38 7.9     ~ 82 0
5 Cl Melotte 20 MGr 03 26 50.6 +48 51 48           ~ 928 0
6 NGC 1647 OpC 04 46 00.4 +19 05 06   6.82 6.4     ~ 189 0
7 NGC 1778 OpC 05 08 07.9 +37 01 01   8.20 7.7     ~ 99 0
8 NGC 1798 OpC 05 11 39.3 +47 41 28           ~ 85 0
9 Cl Berkeley 69 OpC 05 24 21.1 +32 36 13           ~ 50 0
10 NGC 2192 OpC 06 15 16.5 +39 50 39     10.9     ~ 52 0
11 NGC 2266 OpC 06 43 19.7 +26 58 35     9.5     ~ 82 0
12 Cl Berkeley 32 OpC 06 58 06.7 +06 25 53           ~ 164 0
13 NGC 2355 OpC 07 16 59.1 +13 46 09     9.7     ~ 127 0
14 NGC 2477 OpC 07 52 11.4 -38 32 47   6.64 5.8     ~ 314 0
15 NGC 2506 OpC 08 00 02.3 -10 46 22   8.28 7.6     ~ 313 0
16 NGC 2527 OpC 08 05 02.4 -28 07 06   6.81 6.5     ~ 119 0
17 NGC 2548 OpC 08 13 34.0 -05 43 11           ~ 227 0
18 NGC 2660 OpC 08 42 40.0 -47 11 59   9.05 8.8     ~ 164 0
19 NGC 2682 OpC 08 51 23.5 +11 48 54           ~ 2528 0
20 NGC 2854 GiG 09 24 03.15673 +49 12 15.6710   13.82       ~ 109 2
21 APG 285 GrG 09 24.1 +49 13           ~ 55 0
22 NGC 3105 OpC 10 00 41.0 -54 47 20   10.73 9.7     ~ 47 0
23 IC 2581 OpC 10 27 29.3 -57 37 31   4.79 4.3     ~ 143 0
24 Cl Bochum 10 OpC 10 42 14.2 -59 08 44   6.40 6.2     ~ 86 0
25 Z 155-31 Sy2 10 52 14.9479088736 +30 03 28.370430468   14.6       ~ 76 0
26 NGC 3532 OpC 11 05 33.9 -58 42 13           ~ 414 0
27 Cl Melotte 105 OpC 11 19 40.6 -63 29 16   9.05 8.5     ~ 81 0
28 Cl Stock 14 OpC 11 43 45.2 -62 31 12   6.33 6.3     ~ 84 0
29 Cl Melotte 111 OpC 12 11 54.9 +25 16 36           ~ 520 0
30 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4565 4
31 NGC 5316 OpC 13 54 02.6 -61 53 05   6.08 6.0     ~ 109 0
32 NGC 5662 OpC 14 34 55.5 -56 40 41   6.18 5.5     ~ 136 0
33 NGC 6025 OpC 16 03 09.4 -60 26 59           ~ 117 0
34 Cl Lynga 6 OpC 16 04 50.7 -51 57 19   10.28 9.5     ~ 95 0
35 NGC 6087 OpC 16 18 55.7 -57 53 32           ~ 198 0
36 NGC 6250 OpC 16 57 55.2 -45 56 48   6.14 5.9     ~ 89 0
37 NGC 6253 OpC 16 59 06.4 -52 42 39     10.2     ~ 209 0
38 NGC 6396 OpC 17 37 37.7 -35 00 58   9.41 8.5     ~ 53 0
39 NGC 6405 OpC 17 40 14.5 -32 14 16           ~ 235 0
40 Cl Collinder 394 OpC 18 52 34.9 -20 10 39     6.3     ~ 96 0
41 NGC 6791 OpC 19 20 52.8 +37 46 40   10.52 9.5     ~ 1120 0
42 NGC 6834 OpC 19 52 12.2 +29 23 54   8.46 7.8     ~ 98 0
43 NGC 6871 OpC 20 06 07.9 +35 46 45   5.43 5.2     ~ 237 0
44 NGC 7044 OpC 21 13 09.6 +42 29 39     12.0     ~ 72 0
45 Cl King 10 OpC 22 55 00.6 +59 10 07           ~ 50 0
46 Cl King 12 OpC 23 53 02.4 +61 57 05           ~ 52 0

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