2019A&A...624A...8A


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.02CEST14:29:52

2019A&A...624A...8A - Astronomy and Astrophysics, volume 624A, 8-8 (2019/4-1)

Investigating dynamical properties of evolved Galactic open clusters.

ANGELO M.S., SANTOS J.F.C., CORRADI W.J.B. and MAIA F.F.S.

Abstract (from CDS):


Context. The stellar content of Galactic open clusters is gradually depleted during their evolution as a result of internal relaxation and external interactions. The final residues of the long-term evolution of open clusters are called open cluster remnants. These are sparsely populated structures that can barely be distinguished from the field.
Aims. We aimed to characterise and compare the dynamical states of a set of 16 objects catalogued as remnants or remnant candidates. We employed parameters that are intimately associated with the dynamical evolution: age, limiting radius, stellar mass, and velocity dispersion. The sample also includes 7 objects that are catalogued as dynamically evolved open clusters for comparison purposes.
Methods. We used photometric data from the 2MASS catalogue, proper motions and parallaxes from the Gaia DR2 catalogue, and a decontamination algorithm that was applied to the three-dimensional astrometric space of proper motions and parallaxes (µα, µδ, p) for stars in the objects' areas. The luminosity and mass functions and total masses for most open cluster remnants are derived here for the first time. Our analysis used predictions of N-body simulations to estimate the initial number of stars of the remnants from their dissolution timescales.
Results. The investigated open cluster remnants present masses (M) and velocity dispersions (σv) within well-defined ranges: M between ∼10-40M and σv between ∼1-7km/s. Some objects in the remnant sample have a limiting radius Rlim≤2pc, which means that they are more compact than the investigated open clusters; other remnants have Rlim between ∼2-7pc, which is comparable to the open clusters. We suggest that cluster NGC 2180 (previously classified as an open cluster) is entering a remnant evolutionary stage. In general, our clusters show signals of depletion of low-mass stars. This confirms their dynamically evolved states.
Conclusions. We conclude that the open cluster remnants we studied are in fact remnants of initially very populous open clusters (N0∼103-104 stars). The outcome of the long-term evolution is to bring the final residues of the open clusters to dynamical states that are similar to each other, thus masking out the memory of the initial formation conditions of star clusters.

Abstract Copyright: © ESO 2019

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

VizieR on-line data: <Available at CDS (J/A+A/624/A8): table1.dat clusters.dat>

Status at CDS:   Tables of objects will be appraised for possible ingestion in SIMBAD.

Simbad objects: 31

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Number of rows : 31

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 188 OpC 00 48 26 +85 15.3           ~ 813 0
2 NGC 752 OpC 01 57 41 +37 47.1           ~ 537 0
3 NGC 1252 Cl* 03 10 49 -57 46.0           ~ 34 0
4 NGC 1582 OpC 04 32 15.4 +43 50 43     7.0     ~ 25 0
5 NGC 1663 OpC 04 49 15.6 +13 10 12   15.78 14.54     ~ 13 0
6 NGC 1901 OpC 05 18 11 -68 27.0           ~ 77 0
7 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14823 1
8 ESO 425-6 OpC 06 04 50 -29 11.0           ~ 8 0
9 NGC 2180 OpC 06 09 48 +04 48.4   9.0       ~ 17 0
10 ESO 425-15 OpC 06 14 35 -29 22.5           ~ 8 0
11 ESO 426-26 OpC 06 36 18 -30 51.5           ~ 7 0
12 ESO 426-33 OpC 06 42 06 -29 26.7           ~ 15 0
13 Cl Alessi 3 OpC 07 16 24 -46 36.0           ~ 28 0
14 C 0740-354 OpC 07 43.0 -35 36           ~ 14 0
15 NGC 2682 OpC 08 51 18 +11 48.0           ~ 2032 0
16 ESO 435-48 OpC 10 09 35.0 -28 21 28           ~ 5 0
17 NGC 3231 Cl* 10 26 57.8 +66 48 55           ~ 4 0
18 ESO 570-12 Cl* 11 12 12 -21 19.2           ~ 6 0
19 M 97 PN 11 14 47.7125021184 +55 01 08.485325068   15.414 15.777 15.960 16.194 ~ 330 1
20 NGC 3680 OpC 11 25 38 -43 14.6   8.40 7.6     ~ 290 0
21 [KPS2012] MWSC 1964 OpC 11 41 35 -62 25.5           ~ 7 0
22 NGC 4337 OpC 12 24 00 -58 07.0   9.44 8.9     ~ 25 0
23 ESO 65-3 OpC 12 51 18 -69 43.8           ~ 5 0
24 ESO 324-15 OpC 13 23 43.0 -41 53 12           ~ 8 0
25 ESO 383-10 Cl* 13 31 30.0 -35 03 56           ~ 3 0
26 Cl Lynga 8 OpC 16 20 04 -50 13.0           ~ 15 0
27 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11532 0
28 NGC 6481 OpC 17 52.8 +04 10           ~ 5 0
29 NGC 7036 Cl* 21 10 02 +15 31.1           ~ 14 0
30 NGC 7193 OpC 22 03 03.0 +10 48 06           ~ 6 0
31 NGC 7772 Cl* 23 51 46 +16 14.8           ~ 15 0

    Equat.    Gal    SGal    Ecl

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2020.07.02-14:29:52

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