2004A&A...422..555B


Query : 2004A&A...422..555B

2004A&A...422..555B - Astronomy and Astrophysics, volume 422, 555-562 (2004/8-1)

Discovery of three optical open clusters in the Galaxy.

BICA E., BONATTO C. and DUTRA C.M.

Abstract (from CDS):

We report the discovery of three optical open clusters in the Milky Way. Two clusters are in Scutum (Cluster 1 at l=18.44° and b=-0.42°, and Cluster 2 at l=19.60° and b=-1.02°), thus projected not far from the Galactic center direction, and the other is in Canis Major (Cluster 3 at l=235.61° and b=-4.10°), near the anti-center direction. Cluster 3 is less populous than Clusters 1 and 2, but presents evidence of being a physical system. The objects were found optically by inspecting maps obtained from the Guide Star Catalogue and images from the Digitized Sky Survey. No previous identification of a cluster has been reported in any of these areas so far. The analysis was carried out with 2MASS photometry in J and H. For Cluster 1 we derive an age of t=25±5Myr, a reddening E(B-V)=2.18±0.03 and a distance from the Sun d=1.64±0.19kpc; for Cluster 2, t=500±100Myr, E(B-V)=0.91±0.03 and d=2.19±0.21kpc; finally for Cluster 3, t=32-100Myr, E(B-V)=0.94±0.03 and d=3.93±0.35kpc. Luminosity and mass functions are derived for Clusters 1 and 2 which, in turn, allow us to estimate their observed masses as 147M and 89M, respectively. Estimated total masses, by extrapolating the mass functions to 0.08M, amount to 382M and 614M for the two clusters. Cluster 3 has an observed mass of ∼55M. The present results indicate that further searches in the optical might still reveal new open clusters, especially in the infrared bands.

Abstract Copyright:

Journal keyword(s): Galaxy: open clusters and associations: general - Galaxy: structure

Nomenclature: Table 1: [BBD2004] Cluster N (Nos 1-3).

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 NAME CMa Dwarf Galaxy G 07 12.6 -27 40     -0.1     ~ 199 1
2 Cl Bica 4 OpC 07 19 07 -22 01.7           ~ 3 0
3 BRAN 16 HII 07 19 07.4 -21 56 17           ~ 14 1
4 NGC 2367 OpC 07 20 07 -21 52.0           ~ 69 0
5 NGC 2682 OpC 08 51 23.0 +11 48 50           ~ 2342 0
6 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14463 0
7 Cl Bica 3 OpC 18 26 04.6 -13 03 29           ~ 15 0
8 Cl Dias 6 OpC 18 30 28.1 -12 19 48           ~ 29 0

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