2014A&A...568A..51S


Query : 2014A&A...568A..51S

2014A&A...568A..51S - Astronomy and Astrophysics, volume 568A, 51-51 (2014/8-1)

Global survey of star clusters in the Milky Way. III. 139 new open clusters at high Galactic latitudes.

SCHMEJA S., KHARCHENKO N.V., PISKUNOV A.E., ROESER S., SCHILBACH E., FROEBRICH D. and SCHOLZ R.-D.

Abstract (from CDS):

An earlier analysis of the Milky Way Star Cluster (MWSC) catalogue revealed an apparent lack of old (t>1Gyr) open clusters in the solar neighbourhood (d≲1kpc). To fill this gap we undertook a search for hitherto unknown star clusters, assuming that the missing old clusters reside at high Galactic latitudes |b|>20°. We were looking for stellar density enhancements using a star count algorithm on the 2MASS point source catalogue. To increase the contrast between potential clusters and the field, we applied filters in colour-magnitude space according to typical colour-magnitude diagrams of nearby old open clusters. The subsequent comparison with lists of known objects allowed us to select thus far unknown cluster candidates. For verification they were processed with the standard pipeline used within the MWSC survey for computing cluster membership probabilities and for determining structural, kinematic, and astrophysical parameters. In total we discovered 782 density enhancements, 524 of which were classified as real objects. Among them 139 are new open clusters with ages 8.3<log(t[yr])<9.7, distances d<3kpc, and distances from the Galactic plane 0.3<Z<1kpc. This new sample has increased the total number of known high latitude open clusters by about 150%. Nevertheless, we still observe a lack of older nearby clusters up to 1kpc from the Sun. This volume is expected to still contain about 60 unknown clusters that probably escaped our detection algorithm, which fails to detect sparse overdensities with large angular size.

Abstract Copyright:

Journal keyword(s): open clusters and associations: general

VizieR on-line data: <Available at CDS (J/A+A/568/A51): catalog.dat index.dat notes.dat stars/* atlas/*>

Nomenclature: Table B.1: [KPS2012] MWSC NNNN N=139 among (Nos 5004-5963).

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 Cl Blanco 1 OpC 00 03 25 -29 57.5           ~ 280 0
2 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11890 1
3 NGC 188 OpC 00 47 12 +85 14.6           ~ 869 0
4 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6373 1
5 Cl Melotte 25 OpC 04 29 47 +16 56.9           ~ 2861 0
6 NGC 1662 OpC 04 48 48 +10 52.9   7.0 6.4     ~ 117 0
7 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16158 1
8 NGC 1980 OpC 05 35 14 -05 55.4     2.5     ~ 99 0
9 NGC 2632 OpC 08 40 13 +19 37.3           ~ 1403 0
10 NGC 2682 OpC 08 51 23 +11 48.8           ~ 2191 0
11 NGC 6774 OpC 19 16 21 -16 20.0           ~ 135 0
12 NAME MWSC 5723 Cl* 19 42 05 -60 00.9           ~ 1 0

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2022.08.15-06:33:56

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