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

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

2002A&A...382...92S - Astronomy and Astrophysics, volume 382, 92-103 (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 K_s 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

Full paper

View the references in ADS

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 - 2023	#notes
1	Cl Melotte 22	OpC	03 46 24.2	+24 06 50						~	3316	0
2	Cl Melotte 25	OpC	04 29 47.3	+16 56 53						~	2960	0
3	NAME Tau-Aur Complex	SFR	04 30	+25.0						~	1329	0
4	NAME Ori Trapezium	OpC	05 35 16.5	-05 23 14						~	1583	1
5	NGC 2632	OpC	08 40 13.0	+19 37 16						~	1478	0
6	HD 95324	*	10 59 14.0086912778	-61 19 14.733649283		6.113	6.180	7.287		B8IV	51	0
7	* pi. Cen	**	11 21 00.40615	-54 29 27.6654						B5Vn	121	0
8	HD 100546	Be*	11 33 25.4408872296	-70 11 41.241297948		6.71	6.30		6.64	A0VaekB8_lB	770	1
9	* lam Cen	*	11 35 46.8780907704	-63 01 11.405976996	2.96	3.10	3.14	3.10	3.11	B9III	130	0
10	* j Cen	Be*	11 49 41.0673344112	-63 47 18.500667000	3.58	4.160	4.308			B3V	118	0
11	HD 103079	**	11 51 51.22590	-65 12 21.2653	4.19					B4V	77	0
12	HD 103884	V*	11 57 40.0073575296	-62 26 55.494356496		5.400	5.557			B4V	77	0
13	HD 103961	V*	11 58 15.2248428408	-56 19 02.323327728		5.360	5.436			B8III	39	0
14	HD 104080	*	11 59 10.6803426432	-45 49 55.998043104		6.272	6.337			B8/9V	38	0
15	HD 104600	*	12 02 37.6925929920	-69 11 32.239021344		5.800	5.876			B9V	64	0
16	* tet02 Cru	SB*	12 04 19.2200768232	-63 09 56.516665140	4.02	4.613	4.716			B3V	101	1
17	HD 104878	**	12 04 38.8864844473	-68 19 44.066287343						A0IV	44	0
18	HD 105382	Be*	12 08 05.2222663992	-50 39 40.575451536	3.65	4.32	4.47	4.53	4.70	B5V	168	0
19	* del Cen	Be*	12 08 21.4976373	-50 43 20.738614	1.51	2.39	2.52	2.48	2.62	B2Vne	307	0
20	* rho Cen	*	12 11 39.1197479712	-52 22 06.384420264	3.20	3.81	3.96	4.05	4.21	B3V	129	0
21	* del Cru	Pu*	12 15 08.7167245	-58 44 56.136936	1.63	2.568	2.752			B2IV	210	1
22	* zet Cru	*	12 18 26.2420745160	-64 00 11.107331280	3.26	3.90	4.05			B2/3V	108	0
23	HD 107696	*	12 22 49.4317993896	-57 40 34.068874692		5.269	5.366			B7Vn	66	0
24	HD 108250	Pu*	12 26 30.8829188064	-63 07 20.047147932	4.15	4.679	4.822			B3/5V	50	0
25	* G Cen	*	12 26 31.7600444794	-51 27 02.288916487	4.02	4.654	4.808			B3V(n)	80	0
26	* alf01 Cru	*	12 26 35.896	-63 05 56.73		1.10	1.28			B0.5IV	145	0
27	* sig Cen	**	12 28 02.3820785	-50 13 50.287232	2.95	3.72	3.91	4.02	4.22	B2V	158	0
28	* gam Mus	SB*	12 32 28.0134336	-72 07 58.759701	3.12	3.73	3.88	3.91	4.08	B5V+A:	146	0
29	* alf Mus	**	12 37 11.0178886	-69 08 08.033239	1.62	2.484	2.649			B2IV	149	1
30	* bet Mus	**	12 46 16.80410	-68 06 29.2164	2.13			5.51		B2V+B3V	119	0
31	HD 110956	*	12 46 22.7145960	-56 29 19.736605	3.86	4.462	4.620			B2/3V	120	0
32	* mu.01 Cru	V*	12 54 35.6245487	-57 10 40.522525	3.12	3.87	4.04	4.14	4.38	B2IV-V	147	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	173	0
34	* lam Cru	Be*	12 54 39.1827302030	-59 08 48.129223088	3.86	4.451	4.602			B3Vne	140	1
35	* H Cen	Pu*	12 57 04.3514246112	-51 11 55.512895560		5.088	5.159			B2IV	59	1
36	* f Cen	*	13 06 16.7036641232	-48 27 47.846528742	4	4.552	4.691			B4V	111	0
37	* ksi02 Cen	SB*	13 06 54.6393973	-49 54 22.482324	3.29	4.08	4.27			B3V	138	0
38	HD 113902	*	13 07 38.2846328832	-53 27 35.149793112		5.629	5.698			B8/9V	66	0
39	V* V831 Cen	El*	13 12 17.59459	-59 55 14.0842	4.11	4.500	4.593	6.33		B7V	84	0
40	V* V964 Cen	EB*	13 20 37.8253517448	-52 44 52.169369424	4.79	5.314	5.443			B5III/IV	81	0
41	HD 116072	Pu*	13 22 35.8501250304	-60 58 19.594661016		6.162	6.153			B3/5	51	1
42	* J Cen	**	13 22 37.9331015842	-60 59 18.170162109	3.81	4.369	4.509			B3V	106	0
43	* eps Cen	bC*	13 39 53.25774	-53 27 59.0081	1.16	2.08	2.30	2.45	2.70	B1III	249	0
44	HD 118978	*	13 42 01.0842903360	-58 47 13.515787716	5.14	5.338	5.372			B9III	54	0
45	* nu. Cen	bC*	13 49 30.2764388	-41 41 15.752069	2.31	3.188	3.386			B2V	193	0
46	* mu. Cen	Be*	13 49 36.9886294	-42 28 25.429594	2.37	3.27	3.43	3.41	3.50	B2Vnpe	431	0
47	* 3 Cen	**	13 51 49.60136	-32 59 38.7067						B5III+B9IV	247	0
48	* h Cen	SB*	13 53 12.5382897240	-31 55 39.430392240	4.04	4.59	4.73			B5IVp	103	0
49	HD 121190	Pu*	13 55 12.1422664176	-52 09 38.957327676	5.33	5.63	5.71			B9V	75	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	175	0
51	* phi Cen	V*	13 58 16.2668006	-42 06 02.714311	2.79	3.608	3.802			B2IV	146	0
52	* ups01 Cen	V*	13 58 40.7486851	-44 48 12.908967	2.87	3.67	3.87	4.01	4.22	B2IV-V	144	0
53	* chi Cen	bC*	14 06 02.7682446	-41 10 46.678780	3.4	4.155	4.343			B2V	216	1
54	HD 124367	Be*	14 14 57.1383087504	-57 05 10.049405532	4.36	4.99	5.07			B4Vne	143	0
55	* iot Lup	V*	14 19 24.2221950	-46 03 29.143666	2.65	3.355	3.529			B2.5IV	111	0
56	* a Cen	Ro*	14 23 02.2390294	-39 30 42.549250	3.50	4.24	4.42	4.53	4.70	B2V	270	0
57	HD 126981	*	14 30 08.6286924144	-45 19 16.881861216	5.15	5.42	5.50			B8V	60	0
58	* eta Cen	Be*	14 35 30.4241610	-42 09 28.170782	1.30	2.12	2.31	2.41	2.59	B2Ve	340	0
59	HD 127971	*	14 35 31.4790402792	-41 31 02.792148564		5.79	5.87			B7V	57	0
60	* rho Lup	V*	14 37 53.2258272	-49 25 32.979759	3.34	3.90	4.05	4.14	4.25	B3/4V	99	0
61	* alf Lup	bC*	14 41 55.7557866	-47 23 17.515486	1.22	2.126	2.286			B1.5III	233	0
62	* b Cen	**	14 41 57.5906796	-37 47 36.594024	3.14	3.83	4.00	4.11	4.26	B3V	137	0
63	* omi Lup	**	14 51 38.3028905	-43 34 31.296546	3.59	4.164	4.313			B5IV	113	0
64	HR 5543	**	14 52 51.0737484	-37 48 11.386959	4.11	4.855	5.015			B7IIIp	121	0
65	* kap Cen	**	14 59 09.6849382	-42 06 15.106919	2.15	2.93	3.11			B2IV	201	0
66	HD 132955	*	15 02 59.2764966384	-32 38 35.849039748	4.69	5.319	5.437			B3V	93	0
67	HD 133937	*	15 08 39.1980242592	-42 52 04.522458612		5.701	5.820			B5/7V	75	0
68	* lam Lup	SB*	15 08 50.6128505350	-45 16 47.500979673	3.18	3.88	4.05			B3V	137	0
69	* e Lup	SB*	15 12 49.5868237	-44 30 01.485338	3.98	4.638	4.806			B3IV/V	77	0
70	V* GG Lup	EB*	15 18 56.3746551072	-40 47 17.596548564		5.495	5.604	5.613		B7V	128	0
71	* del Lup	bC*	15 21 22.3138254072	-40 38 51.109328940	2.12	2.995	3.190			B1.5IV	216	0
72	* eps Lup	bC*	15 22 40.8682566	-44 41 22.614637	2.46	3.191	3.366			B3IV+B3:V	172	0
73	* phi02 Lup	*	15 23 09.3500506	-36 51 30.552048	3.77	4.39	4.54	4.60	4.74	B4V	129	0
74	HD 137432	SB*	15 27 18.1304610624	-36 46 03.214731900	4.69	5.30	5.45	5.54	5.71	B5V	92	0
75	* d Lup	Be*	15 35 53.24806	-44 57 30.1982	3.68			6.70		B3V	121	0
76	* tau Lib	SB*	15 38 39.3694957	-29 46 39.895604		3.481	3.642			B2.5V	156	0
77	* psi02 Lup	SB*	15 42 41.0220569	-34 42 37.461720	4.08	4.576	4.721			B5V	111	0
78	HD 140784	V*	15 46 44.2174303104	-34 40 56.830010556		5.481	5.600			B8V	57	1
79	* b Sco	*	15 50 58.7444628720	-25 45 04.658676984	3.84	4.552	4.635			B1.5Vn	288	0
80	* lam Lib	SB*	15 53 20.0538968232	-20 10 01.471003716	4.43	4.997	5.027			B3V	210	0
81	* 2 Sco	**	15 53 36.71880	-25 19 37.7087	3.86	4.52	4.59			B2.5Vn	158	0
82	HD 142165	SB*	15 53 53.9142283800	-24 31 59.373289920	4.95	5.350	5.372			B5V	130	0
83	HD 142184	Be*	15 53 55.8637866220	-23 58 41.143370530	4.77	5.352	5.402			B2V	228	0
84	* 3 Sco	Ro*	15 54 39.5296532472	-25 14 37.459966128	5.23	5.81	5.87			B8III/IV	210	0
85	* 47 Lib	Ro*	15 55 00.3615238176	-19 22 58.554643620		5.930	5.957			B2/3V	118	0
86	* rho Sco	SB*	15 56 53.0762391	-29 12 50.661185	2.84	3.66	3.86	3.97	4.17	B2IV-V	201	0
87	HD 142883	Ce*	15 57 40.4636201088	-20 58 59.082560004		5.839	5.836			B3V	141	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	436	0
89	V* V913 Sco	Ro*	15 58 34.8665694960	-24 49 53.361727284	4.70	5.34	5.43			B5V	201	0
90	* pi. Sco	EB*	15 58 51.1132378	-26 06 50.788602	1.82	2.71	2.91	3.00	3.20	B1V+B2:V:	394	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	730	0
92	HD 143699	*	16 03 24.1894502	-38 36 09.152751	4.18	4.75	4.89	4.96	5.10	B5/7III/IV	140	0
93	* bet01 Sco	bC*	16 05 26.2319826	-19 48 19.630018	1.68	2.55	2.62	2.60	2.69	B1V	553	0
94	* bet02 Sco	SB*	16 05 26.5686169680	-19 48 06.845424840	4.19	4.87	4.89	5.58		B2V	215	0
95	* tet Lup	*	16 06 35.5439828160	-36 48 08.173906632	3.36	4.027	4.201			B2.5Vn	115	0
96	* ome Sco	bC*	16 06 48.4269211	-20 40 09.090235	3.10	3.92	3.97	3.91	3.99	B1V	465	0
97	HD 144844	V*	16 08 43.7202865416	-23 41 07.483461252	5.59	5.90	5.88			B9V	150	0
98	HD 144987	PM*	16 09 52.5898714152	-33 32 44.903550228		5.410	5.497			B8V	41	0
99	* nu. Sco	**	16 11 59.73568	-19 27 38.5361	3.42	4.05	4.00	3.90	3.87	B2V	374	0
100	* 12 Sco	**	16 12 16.03911	-28 25 02.3122						B9V	74	0
101	* c02 Sco	SB*	16 12 18.2046168820	-27 55 34.953285603	3.66	4.413	4.568			B2V	179	0
102	HD 145792	a2*	16 13 45.4979280816	-24 25 19.529982106		6.43	6.43		6.14	B6IV	123	0
103	HD 145964	*	16 14 28.8827284680	-21 06 27.491575572		6.407	6.405			B9V	80	0
104	HD 146001	*	16 14 53.4294665736	-25 28 37.100440632	5.73	6.09	6.05			B8V	146	0
105	NAME Upper Sco-Cen	As*	16 15	-24.2						~	1282	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	861	0
107	HD 147001	V*	16 21 27.0327351600	-48 11 19.041336276		6.456	6.498			B7V	33	0
108	HR 6100	**	16 24 31.7543889048	-37 33 57.760482924	4.92	5.308	5.414			B8V	52	1
109	* rho Oph A	*	16 25 35.1185711280	-23 26 49.831640736	4.3	5.22	5.05			B1V	405	0
110	* chi Oph	Be*	16 27 01.4355697915	-18 27 22.499961252	3.95	4.71	4.43	3.97	3.73	B2Vne	593	0
111	* N Sco	V*	16 31 22.9330023	-34 42 15.714620	3.30	4.06	4.23	4.29	4.41	B2III-IV	140	0
112	* tau Sco	*	16 35 52.9528530	-28 12 57.661515	1.55	2.56	2.81	2.93	3.18	B0.2V	907	0
113	HD 149425	*	16 36 28.6730639112	-40 18 10.916595000		7.20	7.10			B9V	40	0
114	V* V1003 Sco	El*	16 38 26.2919895528	-43 23 54.328921872	5.2	5.81	5.83			B2V	77	0
115	HD 150591	*	16 43 54.0820649376	-41 06 48.038658840		6.049	6.116			B6/7V	52	0
116	HD 150742	*	16 44 42.5926704048	-40 50 22.830249192		5.528	5.628			B3V	73	1
117	HD 151109	*	16 47 01.6778010840	-39 32 01.941644076		6.94	7.00			B9IV/V	34	0
118	HD 151726	*	16 50 45.5185967856	-38 15 23.108562648		7.20	7.24			B9V	31	0
119	* mu.01 Sco	EB*	16 51 52.2283548696	-38 02 50.638070400	1.98	2.82	2.98			B1V+B	290	0
120	* mu.02 Sco	V*	16 52 20.1453198	-38 01 03.125839	2.52	3.343	3.542			B2IV	143	0
121	* tet Oph	bC*	17 22 00.5793468	-24 59 58.366974	2.18	3.03	3.26	3.38	3.58	OB	327	0
122	HD 161743	*	17 48 57.9263718864	-38 07 07.502550924		7.67	7.20			B9IV	22	0

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