# 2008A&A...492..685D

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 Query : 2008A&A...492..685D

2008A&A...492..685D - Astronomy and Astrophysics, volume 492, 685-693 (2008/12-4)

Open cluster stability and the effects of binary stars.

DE GRIJS R., GOODWIN S.P., KOUWENHOVEN M.B.N. and KROUPA P.

Abstract (from CDS):

The diagnostic age versus mass-to-light ratio diagram is often used in attempts to constrain the shape of the stellar initial mass function (IMF) and the potential longevity of extragalactic young to intermediate-age massive star clusters. Here, we explore its potential for Galactic open clusters. On the basis of a small, homogenised cluster sample, we provide useful constraints on the presence of significant binary fractions. Using the massive young Galactic cluster Westerlund 1 as a key example, we caution that stochasticity in the IMF introduces significant additional uncertainties. We conclude that, for an open cluster to survive for any significant length of time, and in the absence of substantial external perturbations, it is necessary but not sufficient to be located close to or (in the presence of a significant binary population) somewhat below the predicted photometric evolutionary sequences for normal'' simple stellar populations, although such a location may be dominated by a remaining bound'' cluster core and thus not adequately reflect the overall cluster dynamics.

Journal keyword(s): Galaxy: open clusters and associations: individual: Westerlund 1, NGC 1976, Hyades, Coma Berenices, Orion Nebular Cluster - stellar dynamics - methods: observational - Galaxy: open clusters and associations: general

Full paper

 Number of rows : 17
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 Cl Melotte 22 OpC 03 46 24 +24 06.8           ~ 3291 0
2 Cl Melotte 25 OpC 04 29 47 +16 56.9           ~ 2937 0
3 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2224 1
4 NAME Ori Trapezium OpC 05 35 16.5 -05 23 14           ~ 1575 1
5 M 42 OpC 05 35 17 -05 23.4           ~ 3980 0
6 NGC 2168 OpC 06 09 05 +24 20.2           ~ 528 0
7 NGC 2323 OpC 07 02 47.5 -08 20 16           ~ 184 0
8 NGC 2516 OpC 07 58 06 -60 48.0           ~ 673 0
9 NGC 2632 OpC 08 40 13 +19 37.3           ~ 1454 0
10 NGC 2682 OpC 08 51 23 +11 48.8           ~ 2240 0
11 NGC 3532 OpC 11 05 40 -58 42.4           ~ 321 0
12 Cl Melotte 111 OpC 12 24 03 +25 39.1           ~ 454 0
13 NGC 5662 OpC 14 34 56 -56 38.4   6.18 5.5     ~ 115 0
14 Cl Westerlund 1 Cl* 16 47 04.00 -45 51 04.9           ~ 529 0
15 NGC 6705 OpC 18 51 04 -06 16.3   6.32 5.8     ~ 400 0
16 NAME Hyades Moving Group MGr ~ ~           ~ 272 0
17 NAME Vela Sheet Cld ~ ~           ~ 14 0

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2023.03.21-11:31:13