2023A&A...672A..29C

Query : 2023A&A...672A..29C

2023A&A...672A..29C - Astronomy and Astrophysics, volume 672A29 (2023/4-1)

Photometric binaries, mass functions, and structural parameters of 78 Galactic open clusters.

CORDONI G., MILONE A.P., MARINO A.F., VESPERINI E., DONDOGLIO E., LEGNARDI M.V., MOHANDASAN A., CARLOS M., LAGIOIA E.P., JANG S. and ZILIOTTO T.

Abstract (from CDS):

Context. Binary stars play a crucial role in our understanding of the formation and evolution of star clusters and their stellar populations.
Aims. We use Gaia Data Release 3 to homogeneously analyze 78 Galactic open clusters and the unresolved binary systems they host, each composed of two main sequence (MS) stars.
Methods. We first investigated the structural parameters of these clusters, such as the core radius and the central density, and determined the cluster mass function (MF) and total mass by interpolating the density profile of each cluster. We measured the fraction of binaries with a large mass ratio and the fraction of blue straggler stars (BSSs), and finally investigated possible connections between the populations of binary stars and BSSs with the main parameters of the host cluster.
Results. Remarkably, we find that the MFs of 78 analyzed open clusters follow a similar trend and are well reproduced by two single power-law functions, with a change in slope around masses of 1 M⊙. The fraction of binary stars ranges from ∼15% to more than ∼60% without significant correlation with the mass and the age of the host cluster. Moreover, we detect hints of a correlation between the total fraction of binary stars and the central density of the host cluster. We compared the fraction of binary stars with that of BSSs, finding that clusters with high and low central density exhibit different trends. The fraction of binaries does not significantly change with the mass of the primary star and the mass ratio. The radial distribution of binary stars depends on cluster age. The binaries of clusters younger than ∼800 Myr typically show a flat radial distribution, with some hints of a double peak. In contrast, the binaries of the remaining clusters are more centrally concentrated than the single stars, which is similar to what is observed in globular clusters.

Abstract Copyright: © The Authors 2023

Journal keyword(s): techniques: photometric - binaries: close - Hertzsprung-Russell and C-M diagrams - stars: luminosity function - mass function - open clusters and associations: general

VizieR on-line data: <Available at CDS (J/A+A/672/A29): tablec1.dat tablec2.dat>

Simbad objects: 82

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Number of rows : 82
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 188 OpC 00 47 14.8 +85 14 42           ~ 990 0
2 Cl Collinder 463 OpC 01 48 35.6 +71 44 28           ~ 70 0
3 NGC 1245 OpC 03 14 44.3 +47 14 06   9.16 8.4     ~ 171 0
4 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
5 NGC 1528 OpC 04 15 27.4 +51 13 21   6.83 6.4     ~ 133 0
6 NGC 1664 OpC 04 50 59.3 +43 39 48           ~ 143 0
7 NGC 1750 OpC 05 03 49.8 +23 40 41           ~ 76 1
8 NGC 1817 OpC 05 12 33.9 +16 41 34           ~ 210 0
9 M 38 OpC 05 28 40.0 +35 49 08   6.69 6.4     ~ 184 2
10 M 37 OpC 05 52 18.6 +32 32 36           ~ 436 0
11 M 41 OpC 06 46 03.1 -20 43 07   4.89 4.5     ~ 308 0
12 NGC 2281 OpC 06 48 19.7 +41 02 35   6.05 5.4     ~ 182 0
13 NGC 2302 OpC 06 51 56.7 -07 05 13           ~ 62 0
14 Cl Haffner 1 OpC 07 00 29.6 -20 34 35           ~ 69 0
15 Cl Alessi 33 OpC 07 02 42.6 -26 29 21           ~ 40 0
16 NGC 2323 OpC 07 02 47.3 -08 22 07           ~ 212 0
17 NGC 2353 OpC 07 14 34.0 -10 15 11   7.30 7.1     ~ 114 0
18 NGC 2358 OpC 07 17 02.6 -17 08 44           ~ 44 1
19 NGC 2360 OpC 07 17 45.8 -15 38 21           ~ 213 0
20 NGC 2374 OpC 07 24 02.3 -13 15 12   8.46 8.0     ~ 63 0
21 NGC 2396 OpC 07 27 59.9 -11 42 19     7.4     ~ 42 0
22 NGC 2422 OpC 07 36 35.8 -14 30 15           ~ 275 0
23 NGC 2423 OpC 07 37 11.3 -13 51 45           ~ 175 0
24 Cl Melotte 71 OpC 07 37 31.3 -12 03 42   7.44 7.1     ~ 149 0
25 NGC 2420 OpC 07 38 24.6 +21 34 26   9.0 8.3     ~ 523 0
26 Cl Haffner 13 OpC 07 40 54.3 -30 02 52           ~ 59 0
27 NGC 2448 OpC 07 44 21.4 -24 53 39           ~ 47 1
28 NGC 2447 OpC 07 44 34.6 -23 51 22           ~ 170 1
29 NGC 2482 OpC 07 55 09.9 -24 16 39   7.71 7.3     ~ 102 0
30 NGC 2516 OpC 07 58 00.5 -60 46 36           ~ 793 0
31 NGC 2527 OpC 08 05 02.4 -28 07 06   6.81 6.5     ~ 119 0
32 NAME Pozzo 1 OpC 08 09 18.7 -47 20 35           ~ 51 0
33 NGC 2547 OpC 08 10 01.5 -49 12 08           ~ 445 0
34 Cl Haffner 22 OpC 08 12 25.9 -27 53 57           ~ 32 0
35 NGC 2546 OpC 08 12 39.8 -37 39 34   6.46 6.3     ~ 125 0
36 Cl Haffner 26 OpC 08 15 35.7 -30 51 06           ~ 37 0
37 NGC 2567 OpC 08 18 36.9 -30 38 15   7.77 7.4     ~ 97 0
38 Cl Pismis 4 OpC 08 35 09.6 -44 25 26   6.16 5.9     ~ 83 0
39 NGC 2632 OpC 08 39 58.4 +19 36 33           ~ 1733 0
40 NGC 2658 OpC 08 43 27.6 -32 39 50     9.2     ~ 55 0
41 NGC 2669 OpC 08 46 29.5 -52 55 05   6.35 6.1     ~ 81 0
42 NGC 2682 OpC 08 51 23.5 +11 48 54           ~ 2528 0
43 NGC 2818 OpC 09 16 10.8 -36 37 09           ~ 108 1
44 IC 2488 OpC 09 27 28.6 -57 00 45           ~ 75 0
45 NGC 2910 OpC 09 30 34.9 -52 54 43   7.49 7.2     ~ 64 0
46 NGC 2925 OpC 09 33 15.7 -53 24 39     8.3     ~ 80 0
47 NGC 3114 OpC 10 01 55.0 -60 02 16   4.47 4.2     ~ 213 0
48 NGC 3532 OpC 11 05 33.9 -58 42 13           ~ 414 0
49 IC 2714 OpC 11 17 30.9 -62 43 09     8.2     ~ 110 0
50 Cl Collinder 258 OpC 12 27 10.8 -60 46 13   7.39 7.1     ~ 76 1
51 Cl Ruprecht 106 GlC 12 38 40.20 -51 09 01.0           ~ 413 0
52 NGC 4609 OpC 12 42 19.2 -62 59 36   7.32 6.9     ~ 96 0
53 NGC 4852 OpC 13 00 12.1 -59 36 25     8.9     ~ 46 0
54 NGC 5168 OpC 13 31 08.7 -60 56 45   9.55 9.1     ~ 60 0
55 Cl Trumpler 21 OpC 13 32 17.9 -62 47 28   7.78 7.7     ~ 62 0
56 NGC 5316 OpC 13 54 02.6 -61 53 05   6.08 6.0     ~ 109 0
57 Cl Lynga 2 OpC 14 24 23.9 -61 19 34   6.65 6.4     ~ 78 0
58 NGC 5617 OpC 14 29 46.5 -60 43 02           ~ 108 0
59 NGC 5822 OpC 15 04 08.3 -54 21 52           ~ 238 0
60 NGC 6025 OpC 16 03 09.4 -60 26 59           ~ 117 0
61 NGC 6087 OpC 16 18 55.7 -57 53 32           ~ 198 0
62 NGC 6152 OpC 16 32 43.9 -52 37 18     8.1     ~ 41 0
63 NGC 6208 OpC 16 49 20.5 -53 43 27   8.06 7.2     ~ 94 0
64 NGC 6242 OpC 16 55 31.8 -39 28 09           ~ 98 0
65 Cl Harvard 17 OpC 17 41 20.5 -40 09 24     7.5     ~ 41 0
66 M 23 OpC 17 56 56.2 -18 58 21           ~ 144 0
67 IC 4725 OpC 18 31 47.5 -19 07 37           ~ 239 0
68 NGC 6652 GlC 18 35 45.63 -32 59 26.6           ~ 474 0
69 NGC 6705 OpC 18 51 03.7 -06 16 18   6.32 5.8     ~ 442 0
70 NGC 6709 OpC 18 51 17.1 +10 20 15   7.18 6.7     ~ 145 0
71 Cl Collinder 394 OpC 18 52 34.9 -20 10 39     6.3     ~ 96 0
72 NGC 6791 OpC 19 20 52.8 +37 46 40   10.52 9.5     ~ 1120 0
73 NGC 6811 OpC 19 37 21.8 +46 22 43   7.47 6.8     ~ 435 0
74 NGC 6819 OpC 19 41 18.3 +40 11 19   8.21 7.3     ~ 719 0
75 M 71 GlC 19 53 46.49 +18 46 45.1           ~ 1190 0
76 NGC 6835 AG? 19 54 32.95 -12 34 03.3   13.3   12.04 12.7 ~ 71 0
77 NGC 6940 OpC 20 34 28.4 +28 17 07           ~ 215 0
78 Cl Alessi 12 OpC 20 43 27.0 +23 51 12           ~ 57 0
79 NGC 7063 OpC 21 24 30.2 +36 29 45   7.32 7.0     ~ 99 0
80 NGC 7209 OpC 22 04 50.7 +46 30 11   8.24 7.7     ~ 144 0
81 NGC 7243 OpC 22 15 16.0 +49 50 07   6.54 6.4     ~ 133 0
82 Cl Stock 12 OpC 23 35 40.6 +52 40 19           ~ 56 0

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