2006MNRAS.371.1301C

Query : 2006MNRAS.371.1301C

2006MNRAS.371.1301C - Mon. Not. R. Astron. Soc., 371, 1301-1310 (2006/September-3)

Fundamental parameters of six neglected old open clusters.

CARRARO G., SUBRAMANIAM A. and JANES K.A.

Abstract (from CDS):

In this paper, we present the first BV I CCD photometry of six overlooked old open clusters (Berkeley 44, NGC 6827, Berkeley 52, Berkeley 56, Skiff 1 and Berkeley 5) and derive estimates of their fundamental parameters by using isochrones from the Padova library. We found that all the clusters are older than the Hyades, with ages ranging from 0.8Gyr (NGC 6827 and Berkeley 5) to 4.0Gyr (Berkeley 56). The latter is one of the old open clusters with the largest heliocentric distance.

In the field of Skiff 1, we recognize a faint blue main sequence identical to the one found in the background of open clusters in the second and third Galactic quadrant, and routinely attributed to the Canis Major accretion event. We use the synthetic colour-magnitude diagram method and a Galactic model to show that this population can be easily interpreted as a thick disc and halo population towards Skiff 1. We finally revise the age distribution of the old open clusters, showing that the previously suggested peak at 5Gyr looses importance as additional old clusters are discovered.


Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS

Journal keyword(s): open clusters and associations: individual: Berkeley 44 - open clusters and associations: individual: NGC 6827 - open clusters and associations: individual: Berkeley 52 - open clusters and associations: individual: Berkeley 56 - open clusters and associations: individual: Skiff 1 - open clusters and associations: individual: Berkeley 5

VizieR on-line data: <Available at CDS (J/MNRAS/371/1301): ber5.dat ber44.dat ber52.dat ber56.dat ngc6827.dat skiff1.dat>

Simbad objects: 11

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Number of rows : 11
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 NAME Skiff J0058+68.4 OpC 00 58 22.1 +68 27 29           ~ 26 0
2 Cl Berkeley 5 OpC 01 47 43.0 +62 56 23           ~ 17 0
3 Cl Melotte 25 OpC 04 30 27.4 +16 46 43           ~ 3309 0
4 NAME Auner 1 OpC 07 04 14.4 -19 45 01           ~ 30 0
5 NAME CMa Dwarf Galaxy G 07 12.6 -27 40     -0.1     ~ 203 1
6 SA 110- reg 18 45 +00.6           ~ 100 0
7 Cl Berkeley 44 OpC 19 17 15.4 +19 32 55           ~ 60 0
8 NGC 6827 OpC 19 48 52.6 +21 12 53           ~ 25 0
9 NGC 6846 OpC 19 56 26.9 +32 21 09     14.2     ~ 21 1
10 Cl Berkeley 52 OpC 20 14 29.0 +28 56 49           ~ 15 0
11 Cl Berkeley 56 OpC 21 17 34.4 +41 49 44           ~ 25 0

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