2007A&A...474...77K

Query : 2007A&A...474...77K

2007A&A...474...77K - Astronomy and Astrophysics, volume 474, 77-104 (2007/10-4)

The primordial binary population. II. Recovering the binary population for intermediate mass stars in Scorpius OB2.

KOUWENHOVEN M.B.N., BROWN A.G.A., PORTEGIES ZWART S.F. and KAPER L.

Abstract (from CDS):

We characterize the binary population in the young and nearby OB association Scorpius OB2 (Sco OB2) using available observations of visual, spectroscopic, and astrometric binaries with intermediate-mass primaries. We take into account observational biases by comparing the observations with simulated observations of model associations. The available data indicate a large binary fraction (>70% with 3σ confidence), with a large probability that all intermediate mass stars in Sco OB2 are part of a binary system. The binary systems have a mass ratio distribution of the form fq(q) ∝qγq_^, with γq≃-0.4. Sco OB2 has a semi-major axis distribution of the form fa(a) ∝aγa_^ with γa≃-1.0 (Oepik's law), in the range 5R☉≲a≲5x106R☉. The log-normal period distribution of Duquennoy & Mayor (1991A&A...248..485D) results in too few spectroscopic binaries, even if the model binary fraction is 100%. Sco OB2 is a young association with a low stellar density; its current population is expected to be very similar to the primordial population. The fact that practically all stars in Sco OB2 are part of a binary (or multiple) system demonstrates that multiplicity is a fundamental factor in the star formation process, at least for intermediate mass stars.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: open clusters and associations: individual: Scorpius OB2 - stars: binaries: visual - stars: binaries: general - stars: formation

Simbad objects: 132

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Number of rows : 132
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 Cl Melotte 20 OpC 03 26 28.1 +48 58 30           ~ 861 0
2 Ass Ori OB 1b As* 05 34.0 -01 30           ~ 266 0
3 HD 89715 ** 10 19 05.07255 -64 40 34.5275   5.72 5.67     A1V 55 0
4 HD 92896 ** 10 41 59.65270 -63 30 26.2741           A3IV 31 0
5 HD 95324 * 10 59 14.0086912778 -61 19 14.733649283   6.113 6.180 7.287   B8IV 52 0
6 * pi. Cen ** 11 21 00.4170807171 -54 29 27.964002014           B5Vn 122 0
7 * lam Cen * 11 35 46.8780907704 -63 01 11.405976996 2.96 3.10 3.14 3.10 3.11 B9III 131 0
8 HD 101582 * 11 41 00.2286887376 -54 32 55.554805212   7.43 7.41     A0V 23 0
9 HD 103079 Pu* 11 51 51.2242408032 -65 12 21.276443520 4.19 4.85 4.99     B4V 79 0
10 HD 104021 * 11 58 38.9321383560 -52 46 07.347512460   7.70 7.49     A7V 26 0
11 HD 104878 ** 12 04 38.8864844473 -68 19 44.066287343           A0IV 45 0
12 HD 105874 ** 12 11 14.8132903 -52 13 03.196604           A6V 21 0
13 HD 106036 * 12 12 10.2742570224 -63 27 14.810920200   7.063 6.977     A2V 38 0
14 NAME Lower Centaurus Crux As* 12 19 -57.1           ~ 477 1
15 HD 107143 * 12 19 16.6045633896 -47 49 48.074273220   7.96 7.86     A1V 25 0
16 HD 108501 Pu* 12 28 19.2604213104 -64 20 27.562335468 6.08 6.14 6.09     A0V 47 0
17 HD 109197 * 12 33 19.9292585496 -54 58 52.061254248   7.708 7.614     A2V 29 0
18 * alf Mus ** 12 37 11.0178886 -69 08 08.033239 1.62 2.484 2.649     B2IV 150 1
19 HD 109808 ** 12 38 07.25326 -55 55 52.3849           A3V 26 0
20 V* FH Mus El* 12 39 55.8519065736 -66 30 40.090934880   6.199 6.252     B8V 56 0
21 HD 110390 ** 12 42 27.2047427280 -61 01 06.662261352   7.35 7.20     A1V 30 0
22 HD 110461 * 12 42 49.7636060376 -55 56 49.299160092   6.029 6.057     B9V 46 0
23 HD 110698 ** 12 44 34.9722498288 -57 17 12.848313876   6.710 6.641     A0IV/V 32 0
24 * bet Mus ** 12 46 16.80410 -68 06 29.2164 2.13     5.51   B2V+B3V 120 0
25 V* V823 Cen a2* 12 56 58.2225017496 -54 35 14.478644184   6.431 6.485     ApSiCr 73 0
26 * f Cen Pu* 13 06 16.7036641232 -48 27 47.846528742 4 4.552 4.691     B4V 113 0
27 V* V831 Cen El* 13 12 17.59459 -59 55 14.0842 4.11 4.500 4.593 6.33   B7V 85 0
28 HD 114772 ** 13 13 23.35287 -50 41 59.3747   5.89 5.90     B9.5V 49 0
29 * J Cen ** 13 22 37.9331015842 -60 59 18.170162109 3.81 4.369 4.509     B3V 106 0
30 HD 117193 * 13 29 36.1669015680 -47 52 32.928999312   7.01 6.93     A1V 24 0
31 HD 119884 ** 13 47 10.5602623680 -52 16 09.326705592   6.949 6.930     A0V 25 0
32 * nu. Cen bC* 13 49 30.2765077433 -41 41 15.750707249 2.31 3.188 3.386     B2V 198 0
33 * mu. Cen Be* 13 49 36.9886872492 -42 28 25.440271450 2.37 3.27 3.43 3.41 3.50 B2Vnpe 434 0
34 HD 121040 SB* 13 54 38.3065448088 -55 44 17.960152740   7.53 7.24     A9V 42 0
35 HD 121336 ** 13 56 19.96521 -54 07 56.7142           A1V 49 0
36 * phi Cen Pu* 13 58 16.2661773764 -42 06 02.724906325 2.79 3.608 3.802     B2IV 151 0
37 HD 122259 * 14 01 45.7013505048 -39 26 19.002112764   7.70 7.54     A3IV/V 28 0
38 * chi Cen bC* 14 06 02.7680367867 -41 10 46.678474802 3.4 4.155 4.343     B2V 219 1
39 HD 122982 * 14 06 08.2355965488 -44 41 20.717275452   7.24 7.23     A0V 26 0
40 HD 123445 * 14 08 51.8860395336 -43 28 14.799908604   6.11 6.17     B9V 66 0
41 HD 124620 * 14 16 31.9640775432 -57 17 50.991153756   7.38 7.18     B9IV 22 0
42 * a Cen Ro* 14 23 02.2387240143 -39 30 42.544559700 3.50 4.24 4.42 4.53 4.70 B2V 274 0
43 HD 127215 * 14 31 14.3791291176 -40 39 21.349596420   7.62 7.47     A1V 28 0
44 HD 128819 * 14 40 17.6471313096 -40 50 30.050532420   6.580 6.649     B8/9V 43 0
45 V* IT Lup a2* 14 40 19.2710755512 -45 47 37.824571176   6.504 6.615     ApSi 63 0
46 * omi Lup ** 14 51 38.3028905 -43 34 31.296546 3.59 4.164 4.313     B5IV 116 0
47 HD 131120 Pu* 14 52 51.0731473122 -37 48 11.382138696 4.11 4.855 5.015     B7IIIp 124 0
48 HD 131399 ** 14 54 25.30919 -34 08 34.0412   7.19 7.08 8.33   A1V 46 0
49 HD 131461 * 14 54 54.4756663626 -36 25 49.298080356   7.32 7.26     A0/1V 25 0
50 * kap Cen bC* 14 59 09.6849382 -42 06 15.106919 2.15 2.93 3.11     B2IV 203 0
51 V* HZ Lup a2* 15 06 33.1978166352 -30 55 06.533677056   5.893 5.977     ApSi 107 0
52 V* HR Lup a2* 15 08 12.1238757000 -40 35 02.155417224 5.25 5.65 5.79     B8IVSi 170 1
53 HD 133937 Pu* 15 08 39.1980242592 -42 52 04.522458612   5.701 5.820     B5/7V 77 0
54 * lam Lup SB* 15 08 50.6128505350 -45 16 47.500979673 3.18 3.88 4.05     B3V 140 0
55 HD 134837 * 15 13 07.6617482160 -36 05 29.109491844   5.996 6.079     B8V 48 1
56 HD 136164 * 15 20 13.3930468800 -34 55 31.574157060   7.97 7.76     A2V 31 0
57 * del Lup bC* 15 21 22.3138254072 -40 38 51.109328940 2.12 2.995 3.190     B1.5IV 220 0
58 HD 136347 * 15 21 30.0957912715 -38 13 07.286608599   6.49 6.56     ApSi 71 0
59 * eps Lup bC* 15 22 40.8682566 -44 41 22.614637 2.46 3.191 3.366     B3IV+B3:V 181 0
60 * phi02 Lup * 15 23 09.3506362429 -36 51 30.557900083 3.77 4.39 4.54 4.60 4.74 B4V 132 0
61 NAME Upper Centaurus Lupus As* 15 24 -41.9           ~ 474 1
62 HD 137432 SB* 15 27 18.1304610624 -36 46 03.214731900 4.69 5.30 5.45 5.54 5.71 B5V 92 0
63 HD 137919 ** 15 30 21.29078 -41 55 08.4957           B9.5V 31 0
64 HD 138138 ** 15 31 17.20862 -33 49 11.4308           A2/3V 41 0
65 HD 138343 * 15 32 10.3302754632 -21 58 00.563463840   7.26 7.23     B9V 37 0
66 * gam Lup El* 15 35 08.44835 -41 10 00.3247 1.76 2.586 2.765     B2IV 178 0
67 * d Lup Be* 15 35 53.24806 -44 57 30.1982 3.68     6.70   B3V 122 0
68 HD 139160 SB* 15 37 28.4996647464 -26 16 47.509681800 5.76 6.171 6.194     B9IV 91 0
69 * tau Lib SB* 15 38 39.3694957 -29 46 39.895604   3.481 3.642     B2.5V 158 0
70 HD 139486 * 15 39 00.0577560912 -19 43 57.199562616   7.67 7.63     B9V 63 0
71 * psi02 Lup SB* 15 42 41.0197420380 -34 42 37.467073334 4.08 4.576 4.721     B5V 113 0
72 HD 140817 ** 15 47 04.4561718672 -35 30 37.241353908   6.89 6.92     A0V 46 0
73 HD 140840 * 15 47 06.1673323416 -35 31 04.939301388   7.26 7.26     B9/A0V 36 0
74 * b Sco * 15 50 58.7444628720 -25 45 04.658676984 3.84 4.552 4.635     B1.5Vn 291 0
75 * 2 Sco ** 15 53 36.71880 -25 19 37.7087 3.86 4.52 4.59     B2.5Vn 159 0
76 HD 142165 SB* 15 53 53.9142283800 -24 31 59.373289920 4.95 5.350 5.372     B5V 133 0
77 HD 142250 * 15 54 30.1089445104 -27 20 19.085902512   6.07 6.10     B7V 113 0
78 HD 142315 SB* 15 54 41.5962061728 -22 45 58.513986900   6.887 6.861     B9V 110 0
79 * 47 Lib Ro* 15 55 00.3615238176 -19 22 58.554643620   5.930 5.957     B2/3V 119 0
80 * rho Sco SB* 15 56 53.0772000457 -29 12 50.667996815 2.84 3.66 3.86 3.97 4.17 B2IV-V 205 0
81 HD 142883 Ce* 15 57 40.4636201088 -20 58 59.082560004   5.839 5.836     B3V 145 0
82 V* V913 Sco Ro* 15 58 34.8665694960 -24 49 53.361727284 4.70 5.34 5.43     B5V 205 0
83 * pi. Sco EB* 15 58 51.1132378 -26 06 50.788602 1.82 2.71 2.91 3.00 3.20 B1V+B2:V: 397 0
84 * eta Lup bC? 16 00 07.3279160436 -38 23 48.138224969 2.36 3.19 3.41     B2.5IV 166 0
85 HD 143567 * 16 01 55.4547295632 -21 58 49.398900888   7.27 7.19 7.87   B9Van 130 0
86 HD 143600 Ro* 16 02 13.5553901832 -22 41 15.211826808   7.40 7.33     B9Vn 81 0
87 HD 143699 * 16 03 24.1895252119 -38 36 09.141541952 4.18 4.75 4.89 4.96 5.10 B5/7III/IV 141 0
88 V* LM Lup a2* 16 04 44.4888713016 -39 26 04.779908880   6.86 6.94   6.968 ApSiCr 67 0
89 HD 144175 * 16 05 19.1477109288 -23 40 08.831414208   7.70 7.64     B9V 46 0
90 * bet01 Sco bC* 16 05 26.2319826 -19 48 19.630018 1.68 2.55 2.62 2.60 2.69 B1V 561 0
91 HD 144254 ** 16 05 43.3887407808 -21 50 19.547779272   7.96 7.78     A1VankA0.5 43 0
92 HD 144118 ** 16 05 46.27839 -39 50 35.9336           A5V 26 0
93 * tet Lup Pu* 16 06 35.5439828160 -36 48 08.173906632 3.36 4.027 4.201     B2.5Vn 118 0
94 HD 144569 ** 16 07 04.6737231984 -16 56 35.760894468   8.06 7.90     A1VasmA0.5 42 0
95 HD 144586 * 16 07 14.9283734928 -17 56 09.731015556   7.91 7.81     A1IV-VkB9 49 0
96 HD 144661 * 16 07 51.8878572504 -24 27 44.447463108 5.74 6.27 6.33     B8IV/V 157 0
97 HD 144925 * 16 09 02.6009674608 -18 59 44.038968072   7.98 7.78     A0Vn 62 0
98 HD 144981 ** 16 09 20.8887100392 -19 27 25.962756444   8.22 8.04     A0.5Vn 60 0
99 HD 145189 ** 16 10 25.3551039048 -23 06 23.383633644   8.00 7.79     A3III/IV 39 0
100 * nu. Sco ** 16 11 59.73568 -19 27 38.5361 3.42 4.05 4.00 3.90 3.87 B2V 381 0
101 NAME Upper Sco Association As* 16 12 -23.4           ~ 1369 1
102 * c02 Sco SB* 16 12 18.2046168820 -27 55 34.953285603 3.66 4.413 4.568     B2V 184 0
103 HD 145792 a2* 16 13 45.4979280816 -24 25 19.529982106   6.43 6.43   6.14 B6IV 125 0
104 HD 145880 * 16 14 57.7665420240 -39 37 40.120708404   7.18 7.16     B9.5V 33 0
105 NAME Upper Sco-Cen As* 16 15 -24.2           ~ 1331 1
106 HD 146285 Ro* 16 16 25.1723345064 -24 59 19.464122400   8.12 7.92   7.47 B8V 80 0
107 HD 146331 Ro* 16 16 50.6245246176 -25 51 46.706743656   8.69 8.30     B9V 45 0
108 V* V933 Sco a2* 16 20 05.4927999744 -20 03 23.030685720   7.56 7.40     B8:VpSrTiSiEu 191 0
109 * sig Sco bC* 16 21 11.3157134 -25 35 34.051476 2.32 3.02 2.89 1.69 1.58 B1III+B1:V 870 0
110 HD 147001 V* 16 21 27.0327351600 -48 11 19.041336276   6.456 6.498     B7V 33 0
111 HD 147432 ** 16 22 51.77663 -23 07 07.5271           A1III/IV 41 0
112 HD 147553 ** 16 23 56.71426 -33 11 57.8305   6.47 6.46     B9.5V(n)+A1V(n) 56 0
113 HD 147701 Ro* 16 24 21.3184926168 -25 01 31.448678376 9.66 9.74 9.20   7.42 B5III 133 0
114 HD 147809 ** 16 24 59.1476326440 -25 21 17.974751148   9.02 8.62     A1V 60 0
115 HD 147888 ** 16 25 24.2915998776 -23 27 36.747568152 6.71 7.05 6.74     B3V 215 0
116 HD 147932 Ro* 16 25 35.0813422344 -23 24 18.806143896 7.24 7.59 7.27     B5V 130 0
117 * rho Oph ** 16 25 35.11766 -23 26 49.8150 4.30 4.85 4.63 4.27 3.96 B2IV+B2V 648 0
118 * chi Oph Be* 16 27 01.4355697915 -18 27 22.499961252 3.95 4.71 4.43 3.97 3.73 B2Vne 598 0
119 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3631 1
120 * alf Sco s*r 16 29 24.45970 -26 25 55.2094 4.08 2.75 0.91 -0.64 -1.87 M1.5Iab+B2Vn 746 0
121 HD 148562 TT* 16 29 54.5953266552 -24 58 46.075015272 8.08 7.99 7.81     A2V 65 0
122 HD 148716 * 16 31 11.0668668000 -29 59 52.443542976   8.93 8.53     F3V 42 0
123 * tau Sco * 16 35 52.9528530 -28 12 57.661515 1.55 2.56 2.81 2.93 3.18 B0.2V 920 0
124 HD 150193 Ae* 16 40 17.9243127240 -23 53 45.193372692 9.69 9.32 8.79 8.41   A3Va(e) 321 0
125 HD 150645 * 16 44 21.0949092528 -44 22 43.479643260   8.19 7.94     A3V 21 0
126 HD 150742 * 16 44 42.5926704048 -40 50 22.830249192   5.528 5.628     B3V 73 0
127 * mu.02 Sco bC? 16 52 20.1453198 -38 01 03.125839 2.52 3.343 3.542     B2IV 150 0
128 HD 154117 * 17 04 27.8222140872 -23 23 25.936601892   8.09 7.09     G8/K0III 20 0
129 HD 154310 * 17 06 20.1895074456 -37 13 39.330455520   6.05 5.98     A2IV 31 0
130 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 943 0
131 Ass Cep OB 6 As* 22 30 +58.0           ~ 43 0
132 NAME Local Group GrG ~ ~           ~ 8393 0

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