2006A&A...455..923B


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.02CET11:52:53

2006A&A...455..923B - Astronomy and Astrophysics, volume 455, 923-930 (2006/9-1)

Discovery of new Milky Way star cluster candidates in the 2MASS point source catalog. V. Follow-up observations of the young stellar cluster candidates RCW 87, [BDSB2003] 164 and [DBSB2003] 172.

BORISSOVA J., IVANOV V.D., MINNITI D. and GEISLER D.

Abstract (from CDS):

Massive clusters are more often found in actively star forming galaxies than in quiescent ones, similar to the Milky Way. We have carried out an extensive survey of obscured Milky Way clusters to determine whether our Galaxy is still forming such objects. Near-infrared spectral classification of some probable cluster members was used to derive the distances to the cluster candidates. Isochrone analysis of deep near-infrared color-magnitude diagrams allowed us to obtain age and mass estimates. We report the physical parameters of three cluster candidates: RCW87 is ∼25Myr old, located at a distance of D∼7.6kpc in the general direction of the Galactic center. Adding the mass of the suspected cluster members we obtain an estimated total cluster mass of ∼10300M. The mid-infrared photometry indicates that some next-generation star formation is on-going in the associated Hii region, probably triggered by supernovae or stellar wind from the older stars in RCW87. The brightest member of [BDSB2003] 164 is an O5V type star, based on our spectroscopy. This limits the cluster age to less than a few million years. The estimated total mass is ∼1760M and the distance is D∼3.2kpc. [DBSB2003] 172 lacks central concentration and most likely this is not a cluster but an extended star forming region. The high mass of RCW87 - if confirmed - puts this object in line with Arches and Quintuplet, among the most young massive clusters in the Galaxy. Further study is necessary to confirm this important result.

Abstract Copyright:

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

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 - 2021
#notes
1 NAME RCW 87 IR Cluster Cl* 15 05 18 -57 31.7           ~ 7 0
2 RCW 87 HII 15 05 19 -57 31.8           ~ 44 2
3 HD 142415 PM* 15 57 40.7918993254 -60 12 00.922769552   7.94 7.34     G1V 97 1
4 [DBS2003] 172 Cl* 16 41 10 -47 07.4           ~ 4 0
5 GAL 351.46-00.44 HII 17 25 31.7 -36 21 54           ~ 23 0
6 [BDS2003] 164 OpC 17 25 32 -36 22.0           ~ 6 0
7 GAL 000.0+00.0 gam 17 45 39.60213 -29 00 22.0000           ~ 12002 0
8 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 649 0
9 NAME Quintuplet Cluster OpC 17 46 13.9 -28 49 48           ~ 462 0

    Equat.    Gal    SGal    Ecl

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2021.03.02-11:52:53

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