2002A&A...382...92S

Query : 2002A&A...382...92S

2002A&A...382...92S - Astronomy and Astrophysics, volume 38292-103 (2002/1-4)

The mass ratio distribution of B-type visual binaries in the Sco OB2 association.

SHATSKY N. and TOKOVININ A.

Abstract (from CDS):

A sample of 115 B-type stars in the Sco OB2 association is examined for existence of visual companions in the J and Ks bands, using the ADONIS near-infrared adaptive optics system and coronograph. Practically all the components in the separation range 0.3"-6.4" (45-900AU) and magnitudes down to K=16 were detected. The K and J-K photometry of the primaries and differential photometry and astrometry of the 96 secondaries are presented. Ten secondaries are new physical components, as inferred from the photometric and statistical criteria, while the rest of the newly detected objects are faint background stars. After a small correction for detection incompleteness and a conversion of the fluxes into masses, an unbiased distribution of the components mass ratio q was derived. The power law f(q)∝q–0.5 fits the observations well, whereas a q–1.8 distribution, which corresponds to a random pairing of stars, is rejected. The companion star fraction is 0.20±0.04 per decade of separation which is comparable to the highest measured binary fraction among low-mass PMS stars and ∼1.6 times higher than the binary fraction of low-mass dwarfs in the solar neighborhood and in open clusters in the same separation range.

Abstract Copyright: ∼

Journal keyword(s): binaries: visual - stars: statistics - formation

VizieR on-line data: <Available at CDS (J/A+A/382/92): table1.dat table2.dat table3.dat>

Simbad objects: 122

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Number of rows : 122
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 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
2 NAME Tau-Aur Complex SFR 04 30 +25.0           ~ 1453 0
3 Cl Melotte 25 OpC 04 30 27.4 +16 46 43           ~ 3309 0
4 NAME Ori Trapezium OpC 05 35 16.5 -05 23 14           ~ 1708 1
5 NGC 2632 OpC 08 39 58.4 +19 36 33           ~ 1733 0
6 HD 95324 * 10 59 14.0086912778 -61 19 14.733649283   6.113 6.180 7.287   B8IV 54 0
7 * pi. Cen ** 11 21 00.4170807171 -54 29 27.964002014           B5Vn 127 0
8 HD 100546 Be* 11 33 25.4408872296 -70 11 41.241297948   6.71 6.30   6.64 A0VaekB8_lB 894 1
9 * lam Cen * 11 35 46.8780907704 -63 01 11.405976996 2.96 3.10 3.14 3.10 3.11 B9III 138 0
10 * j Cen Be* 11 49 41.0673344112 -63 47 18.500667000 3.58 4.160 4.308     B3V 125 0
11 HD 103079 Pu* 11 51 51.2242408032 -65 12 21.276443520 4.19 4.85 4.99     B4V 86 0
12 HD 103884 Pu* 11 57 40.0073575296 -62 26 55.494356496   5.400 5.557     B4V 81 0
13 HD 103961 V* 11 58 15.2248428408 -56 19 02.323327728   5.360 5.436     B8III 43 0
14 HD 104080 * 11 59 10.6803426432 -45 49 55.998043104   6.272 6.337     B8/9V 43 0
15 HD 104600 * 12 02 37.6925929920 -69 11 32.239021344   5.800 5.876     B9V 71 0
16 * tet02 Cru SB* 12 04 19.2200768232 -63 09 56.516665140 4.02 4.613 4.716     B3V 106 1
17 HD 104878 ** 12 04 38.8864844473 -68 19 44.066287343           A0IV 49 0
18 HD 105382 Be* 12 08 05.2222663992 -50 39 40.575451536 3.65 4.32 4.47 4.53 4.70 B5V 186 0
19 * del Cen Be* 12 08 21.4976373 -50 43 20.738614 1.51 2.39 2.52 2.48 2.62 B2Vne 320 0
20 * rho Cen Pu* 12 11 39.1197479712 -52 22 06.384420264 3.20 3.81 3.96 4.05 4.21 B3V 136 0
21 * del Cru Pu* 12 15 08.7184790676 -58 44 56.126676618 1.63 2.568 2.752     B2IV 223 1
22 * zet Cru Pu* 12 18 26.2420745160 -64 00 11.107331280 3.26 3.90 4.05     B2/3V 120 0
23 HD 107696 * 12 22 49.4317993896 -57 40 34.068874692   5.269 5.366     B7Vn 77 0
24 HD 108250 Pu* 12 26 30.8829188064 -63 07 20.047147932 4.15 4.679 4.822     B3/5V 58 0
25 * G Cen Pu* 12 26 31.7600444794 -51 27 02.288916487 4.02 4.654 4.808     B3V(n) 93 0
26 * alf01 Cru * 12 26 35.896 -63 05 56.73   1.10 1.28     B0.5IV 150 0
27 * sig Cen ** 12 28 02.3821158564 -50 13 50.296708174 2.95 3.72 3.91 4.02 4.22 B2V 175 0
28 * gam Mus SB* 12 32 28.0129260853 -72 07 58.763241944 3.12 3.73 3.88 3.91 4.08 B5V+A: 155 0
29 * alf Mus ** 12 37 11.0178886 -69 08 08.033239 1.62 2.484 2.649     B2IV 163 1
30 * bet Mus ** 12 46 16.80410 -68 06 29.2164 2.13     5.51   B2V+B3V 129 0
31 HD 110956 Pu* 12 46 22.7144465193 -56 29 19.735770746 3.86 4.462 4.620     B2/3V 130 0
32 * mu.01 Cru Pu* 12 54 35.6242611666 -57 10 40.528916907 3.12 3.87 4.04 4.14 4.38 B2IV-V 159 0
33 * mu.02 Cru Be* 12 54 36.8841589536 -57 10 07.193918388 4.59 5.09 5.20 5.00 5.06 B5Vne 189 0
34 * lam Cru Be* 12 54 39.1827302030 -59 08 48.129223088 3.86 4.451 4.602     B3Vne 150 1
35 * H Cen Pu* 12 57 04.3514246112 -51 11 55.512895560   5.088 5.159     B2IV 68 1
36 * f Cen Pu* 13 06 16.7036641232 -48 27 47.846528742 4 4.552 4.691     B4V 121 0
37 * ksi02 Cen SB* 13 06 54.6394033029 -49 54 22.487112422 3.29 4.08 4.27     B3V 150 0
38 HD 113902 * 13 07 38.2846328832 -53 27 35.149793112   5.629 5.698     B8/9V 73 0
39 HD 114529 El? 13 12 17.5729759027 -59 55 14.026825185 4.11 4.500 4.593 6.33   B7V 90 0
40 V* V964 Cen EB* 13 20 37.8253517448 -52 44 52.169369424 4.79 5.314 5.443     B5III/IV 90 0
41 HD 116072 EB* 13 22 35.8501250304 -60 58 19.594661016   6.162 6.153     B3/5 56 0
42 * J Cen ** 13 22 37.9331015842 -60 59 18.170162109 3.81 4.369 4.509     B3V 114 0
43 * eps Cen bC* 13 39 53.25774 -53 27 59.0081 1.16 2.08 2.30 2.45 2.70 B1III 259 0
44 HD 118978 * 13 42 01.0842903360 -58 47 13.515787716 5.14 5.338 5.372     B9III 60 0
45 * nu. Cen bC* 13 49 30.2765077433 -41 41 15.750707249 2.31 3.188 3.386     B2V 213 0
46 * mu. Cen Be* 13 49 36.9886872492 -42 28 25.440271450 2.37 3.27 3.43 3.41 3.50 B2Vnpe 453 0
47 * 3 Cen ** 13 51 49.60136 -32 59 38.7067           B5III+B9IV 256 0
48 * h Cen SB* 13 53 12.5382897240 -31 55 39.430392240 4.04 4.59 4.73     B5IVp 108 0
49 HD 121190 Pu* 13 55 12.1422664176 -52 09 38.957327676 5.33 5.63 5.71     B9V 83 0
50 * zet Cen SB* 13 55 32.38565 -47 17 18.1482 1.42 2.33 2.55 2.69 2.89 B2.5IV 184 0
51 * phi Cen Pu* 13 58 16.2661773764 -42 06 02.724906325 2.79 3.608 3.802     B2IV 166 0
52 * ups01 Cen Pu* 13 58 40.7486851 -44 48 12.908967 2.87 3.67 3.87 4.01 4.22 B2IV-V 157 0
53 * chi Cen bC* 14 06 02.7680367867 -41 10 46.678474802 3.4 4.155 4.343     B2V 231 1
54 HD 124367 Be* 14 14 57.1383087504 -57 05 10.049405532 4.36 4.99 5.07     B4Vne 153 0
55 * iot Lup V* 14 19 24.2211609376 -46 03 29.139332461 2.65 3.355 3.529     B2.5IV 120 0
56 * a Cen Ro* 14 23 02.2387240143 -39 30 42.544559700 3.50 4.24 4.42 4.53 4.70 B2V 289 0
57 HD 126981 * 14 30 08.6286924144 -45 19 16.881861216 5.15 5.42 5.50     B8V 64 0
58 * eta Cen Be* 14 35 30.4241610 -42 09 28.170782 1.30 2.12 2.31 2.41 2.59 B2Ve 361 1
59 HD 127971 Pu* 14 35 31.4790402792 -41 31 02.792148564   5.79 5.87     B7V 65 0
60 * rho Lup V* 14 37 53.2261607412 -49 25 32.981831985 3.34 3.90 4.05 4.14 4.25 B3/4V 112 0
61 * alf Lup bC* 14 41 55.7557866 -47 23 17.515486 1.22 2.126 2.286     B1.5III 247 0
62 * b Cen ** 14 41 57.5905450998 -37 47 36.580200460 3.14 3.83 4.00 4.11 4.26 B2.5V 159 0
63 * omi Lup ** 14 51 38.3028905 -43 34 31.296546 3.59 4.164 4.313     B5IV 123 0
64 HD 131120 Pu* 14 52 51.0731473122 -37 48 11.382138696 4.11 4.855 5.015     B7IIIp 134 0
65 * kap Cen bC* 14 59 09.6849382 -42 06 15.106919 2.15 2.93 3.11     B2IV 212 0
66 HD 132955 Pu* 15 02 59.2764966384 -32 38 35.849039748 4.69 5.319 5.437     B3V 102 0
67 HD 133937 Pu* 15 08 39.1980242592 -42 52 04.522458612   5.701 5.820     B5/7V 87 0
68 * lam Lup SB* 15 08 50.6128505350 -45 16 47.500979673 3.18 3.88 4.05     B3V 147 0
69 * e Lup SB* 15 12 49.5875193435 -44 30 01.490425801 3.98 4.638 4.806     B3IV/V 90 0
70 V* GG Lup SB* 15 18 56.3746551072 -40 47 17.596548564   5.495 5.604 5.613   B7V 146 0
71 * del Lup bC* 15 21 22.3138254072 -40 38 51.109328940 2.12 2.995 3.190     B1.5IV 230 0
72 * eps Lup bC* 15 22 40.8682566 -44 41 22.614637 2.46 3.191 3.366     B3IV+B3:V 193 0
73 * phi02 Lup * 15 23 09.3506362429 -36 51 30.557900083 3.77 4.39 4.54 4.60 4.74 B4V 139 0
74 HD 137432 SB* 15 27 18.1304610624 -36 46 03.214731900 4.69 5.30 5.45 5.54 5.71 B5V 102 0
75 * d Lup Be* 15 35 53.24806 -44 57 30.1982 3.68     6.70   B3V 129 0
76 * tau Lib SB* 15 38 39.3694957 -29 46 39.895604   3.481 3.642     B2.5V 170 0
77 * psi02 Lup SB* 15 42 41.0197420380 -34 42 37.467073334 4.08 4.576 4.721     B5V 122 0
78 HD 140784 ** 15 46 44.2174303104 -34 40 56.830010556   5.481 5.600     B8V 63 0
79 * b Sco * 15 50 58.7444628720 -25 45 04.658676984 3.84 4.552 4.635     B1.5Vn 305 0
80 * lam Lib SB* 15 53 20.0538968232 -20 10 01.471003716 4.43 4.997 5.027     B3V 223 0
81 * 2 Sco ** 15 53 36.71880 -25 19 37.7087 3.86 4.52 4.59     B2.5Vn 169 0
82 HD 142165 SB* 15 53 53.9142283800 -24 31 59.373289920 4.95 5.350 5.372     B5V 146 0
83 HD 142184 Be* 15 53 55.8637866220 -23 58 41.143370530 4.77 5.352 5.402     B2V 261 1
84 * 3 Sco Ro* 15 54 39.5296532472 -25 14 37.459966128 5.23 5.81 5.87     B8III/IV 232 0
85 * 47 Lib Ro* 15 55 00.3615238176 -19 22 58.554643620   5.930 5.957     B2/3V 125 0
86 * rho Sco SB* 15 56 53.0772000457 -29 12 50.667996815 2.84 3.66 3.86 3.97 4.17 B2IV-V 221 0
87 HD 142883 Ce* 15 57 40.4636201088 -20 58 59.082560004   5.839 5.836     B3V 156 0
88 * 48 Lib Be* 15 58 11.3682502453 -14 16 45.681109093 4.61 4.77 4.87 4.91 4.96 B5IIIp_sh 446 0
89 V* V913 Sco Ro* 15 58 34.8665694960 -24 49 53.361727284 4.70 5.34 5.43     B5V 226 0
90 * pi. Sco SB* 15 58 51.1132378 -26 06 50.788602 1.82 2.71 2.91 3.00 3.20 B1V+B2:V: 415 0
91 * del Sco SB* 16 00 20.00528 -22 37 18.1431 1.30 2.20 2.32 2.36 2.49 B0.3IV 776 0
92 HD 143699 * 16 03 24.1895252119 -38 36 09.141541952 4.18 4.75 4.89 4.96 5.10 B5/7III/IV 154 0
93 * bet01 Sco bC* 16 05 26.2319826 -19 48 19.630018 1.68 2.55 2.62 2.60 2.69 B1V 577 0
94 * bet02 Sco SB* 16 05 26.5686169680 -19 48 06.845424840 4.19 4.87 4.89 5.58   B2V 229 0
95 * tet Lup Pu* 16 06 35.5439828160 -36 48 08.173906632 3.36 4.027 4.201     B2.5Vn 130 0
96 * ome Sco bC* 16 06 48.4249866846 -20 40 09.079866331 3.10 3.92 3.97 3.91 3.99 B1V 492 0
97 HD 144844 V* 16 08 43.7202865416 -23 41 07.483461252 5.59 5.90 5.88     B9V 168 0
98 HD 144987 PM* 16 09 52.5898714152 -33 32 44.903550228   5.410 5.497     B8V 45 0
99 * nu. Sco ** 16 11 59.73568 -19 27 38.5361 3.42 4.05 4.00 3.90 3.87 B2V 404 0
100 * 12 Sco ** 16 12 16.03911 -28 25 02.3122           B9V 79 0
101 * c02 Sco SB* 16 12 18.2046168820 -27 55 34.953285603 3.66 4.413 4.568     B2V 201 0
102 HD 145792 a2* 16 13 45.4979280816 -24 25 19.529982106   6.43 6.43   6.14 B6IV 137 0
103 HD 145964 * 16 14 28.8827284680 -21 06 27.491575572   6.407 6.405     B9V 91 0
104 HD 146001 * 16 14 53.4294665736 -25 28 37.100440632 5.73 6.09 6.05     B8V 161 0
105 NAME Upper Sco-Cen As* 16 15 -24.2           ~ 1497 1
106 * sig Sco bC* 16 21 11.3157134 -25 35 34.051476 2.32 3.02 2.89 1.69 1.58 B1III+B1:V 898 0
107 HD 147001 V* 16 21 27.0327351600 -48 11 19.041336276   6.456 6.498     B7V 39 0
108 HD 147628 ** 16 24 31.7543889048 -37 33 57.760482924 4.92 5.31 5.42     B8V 61 0
109 * rho Oph A SB* 16 25 35.1185711280 -23 26 49.831640736 4.3 5.22 5.05     B1V 444 0
110 * chi Oph Be* 16 27 01.4355697915 -18 27 22.499961252 3.95 4.71 4.43 3.97 3.73 B2Vne 624 0
111 * N Sco V* 16 31 22.9344803220 -34 42 15.725494158 3.30 4.06 4.23 4.29 4.41 B2III-IV 151 0
112 * tau Sco * 16 35 52.9528530 -28 12 57.661515 1.55 2.56 2.81 2.93 3.18 B0V 959 0
113 HD 149425 * 16 36 28.6730639112 -40 18 10.916595000   7.20 7.10     B9V 48 0
114 V* V1003 Sco Pu* 16 38 26.2919895528 -43 23 54.328921872 5.2 5.81 5.83     B2V 88 0
115 HD 150591 * 16 43 54.0820649376 -41 06 48.038658840   6.049 6.116     B6/7V 62 0
116 HD 150742 * 16 44 42.5926704048 -40 50 22.830249192   5.528 5.628     B3V 84 0
117 HD 151109 * 16 47 01.6778010840 -39 32 01.941644076   6.94 7.00     B9IV/V 43 0
118 HD 151726 * 16 50 45.5185967856 -38 15 23.108562648   7.20 7.24     B9V 40 0
119 * mu.01 Sco Be* 16 51 52.2283548696 -38 02 50.638070400 1.98 2.82 2.98     B1V+B 305 0
120 * mu.02 Sco bC? 16 52 20.1453198 -38 01 03.125839 2.52 3.343 3.542     B2IV 161 0
121 * tet Oph bC* 17 22 00.5793468 -24 59 58.366974 2.18 3.03 3.26 3.38 3.58 OB 350 0
122 HD 161743 * 17 48 57.9263718864 -38 07 07.502550924   7.67 7.20     B9IV 23 0

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