2000A&A...356..541K

Query : 2000A&A...356..541K

2000A&A...356..541K - Astronomy and Astrophysics, volume 356541-558 (2000/4-2)

Multiplicity of X-ray selected T Tauri stars in the Scorpius-Centaurus OB association.

KOEHLER R., KUNKEL M., LEINERT C. and ZINNECKER H.

Abstract (from CDS):

We report the results of a search for binarity among young stars, performed in the Scorpius-Centaurus OB association on a sample of 118 X-ray selected T Tauri stars. We use speckle interferometry and direct-imaging observations to find companions in the separation range 0.13"-6". After corrections to account for confusion with background stars and for the bias induced by the X-ray selection, we find a multiplicity (number of binaries or multiples divided by number of systems) of (32.6±6.1)%, and a number of companions per system of (35.2±6.3)%. This is higher by a factor of 1.59±0.34 compared to main-sequence stars, but slightly lower than in a sample in the Taurus-Auriga star-forming region that was selected and studied similary. In Scorpius-Centaurus, we find fewer binaries with nearly equal brightness than in Taurus-Auriga. There are significant differences between the period distributions in the two subgroups Upper Scorpius A and B: The peak of the distribution of stars in US-A is at about 105days, while that of stars in US-B is around 106.5days. We compared our results with the optical multiplicity survey of Brandner et al. (1996A&A...307..121B), whose sample contains 49 stars that were also observed by us, and find no infrared companions. The flux ratio distributions of close and wide binaries in our sample show no significant difference.

Abstract Copyright: ∼

Journal keyword(s): stars: pre-main sequence - stars: binaries: visual - infrared: stars - surveys - techniques: interferometric

VizieR on-line data: <Available at CDS (J/A+A/356/541): table1.dat>

Nomenclature: Table 1: [KKL2000b] NN (Nos 1-99), = [KKL2000b] RX JHHMM.m+DDMMA N=21.

CDS comments: T. 2 : NTTS 155219-2314 = ScoPMS 8b, T. 4 : NTTS 155220-2313 = ScoPMS 8a

Simbad objects: 138

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Number of rows : 138
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 Haro 6-37 Or* 04 46 58.97952 +17 02 38.1948           K7e+M1e 125 0
5 NAME Ori Trapezium OpC 05 35 16.5 -05 23 14           ~ 1708 1
6 NAME Chamaeleon Region SFR 11 55 -78.0           ~ 887 0
7 NAME Upper Centaurus Lupus MGr 15 24 -41.9           ~ 567 1
8 CD-30 12200 Y*O 15 24 11.4690885360 -30 30 58.241359224   11.75 10.92     K0 9 0
9 CD-30 12200B Y*O 15 24 13.0345522488 -30 30 57.247601400       13.447   M1 7 0
10 RX J1528.0-2600 TT* 15 28 03.2204162328 -26 00 03.372195744   13.14 11.98 11.49   K3 6 1
11 HD 137727 TT* 15 28 44.03424 -31 17 38.0284       9.42 8.014 G6/8 38 0
12 HD 137876B TT* 15 29 26.8552140624 -28 50 50.714604024           G6 2 0
13 HD 137876 TT* 15 29 26.8783800744 -28 50 52.336861944   9.47 8.72   7.750 G8V 42 0
14 HD 138009 TT* 15 30 26.23621 -32 18 12.9163   10.01 9.47 9.27   G6V 38 0
15 2MASS J15304790-3022054 TT* 15 30 47.9028446496 -30 22 05.502642384           K2 7 0
16 CD-33 10568 TT* 15 31 21.9300091656 -33 29 39.448367196   11.56 10.834   9.860 G9IV 28 0
17 RX J1531.5-3021 Y*O 15 31 29.610360 -30 21 54.03312   14.31 12.96 12.60   M0 5 0
18 RX J1534.3-3300 TT* 15 34 23.1373834080 -33 00 08.797786056     12.639   10.939 M0 16 0
19 HD 138779 SB* 15 35 13.6565847264 -28 28 27.673779108   8.72 8.13     G2V 41 0
20 RX J1535.8-2959 TT* 15 35 48.559992 -29 58 55.22628   16.267 14.909 14.246   M4 21 0
21 RX J1536.5-3246 TT* 15 36 33.82104 -32 46 13.0440   16.320 14.769 14.828   M3 3 0
22 NAME CD-31 12102BC TT* 15 37 01.73928 -31 36 38.4408       11.88 9.88 K7 3 0
23 CD-31 12102A TT* 15 37 02.1369294264 -31 36 39.826568448   10.62 9.99 9.97 9.11 G6IV 15 0
24 CD-30 12396 TT* 15 37 51.3419994672 -30 45 16.047499572   12.50 11.47     K2Ve 11 0
25 CD-32 10957 * 15 38 16.1613702744 -32 29 23.574242508   11.31 10.53     G3 5 0
26 2MASS J15385554-3116288 Y*O 15 38 55.5599650464 -31 16 28.951601520           M2 3 0
27 DENIS J153901.8-295630 * 15 39 01.8661417584 -29 56 30.792289596   14.11   12.42 11.845 K4 10 0
28 RX J1539.4-3446 X 15 39 25.3 -34 46 47           ~ 2 0
29 HD 139450 * 15 39 25.3237841544 -34 46 47.694232668   9.29 8.73     G0/1V 36 0
30 2MASS J15392602-2958462 Or* 15 39 26.0207560560 -29 58 46.215770016           M2 10 0
31 Sz 65 Or* 15 39 27.7716659160 -34 46 17.211087984   13.11 12.13 11.33 10.76 K7 118 0
32 Sz 66 TT* 15 39 28.2828956688 -34 46 18.082914564   14.9   14.51 12.56 M2 75 0
33 2MASS J15393457-2953359 Y*O 15 39 34.5691577280 -29 53 35.822035320           M3 4 0
34 2MASS J15401344-3018302 Y*O 15 40 13.4474844936 -30 18 30.202850772           M3 2 0
35 2MASS J15404543-3121113 Y*O 15 40 45.4351706304 -31 21 11.408120532           M4 4 0
36 RX J1540.7-3121 X 15 40 45.44 -31 21 11.4           ~ 2 0
37 2MASS J15404588-3121098 Y*O 15 40 45.8870458128 -31 21 09.897266628           M5 4 0
38 2MASS J15405655-3024245 TT* 15 40 56.5494374544 -30 24 24.587404812     14.53     M2 5 0
39 2MASS J15415753-3019059 TT* 15 41 57.5345038920 -30 19 05.919589416     16.06     M4 5 0
40 2MASS J15432925-2925340 TT* 15 43 29.2541731944 -29 25 34.057144812   12.25 11.39     K0 5 0
41 2MASS J15435166-3306297 TT* 15 43 51.666 -33 06 29.78     14.86     M3 6 0
42 CD-32 11039 TT* 15 44 03.7731048192 -33 11 11.204274192   11.71 10.87 10.744   K0IVe 29 0
43 UCAC4 294-084327 TT* 15 44 16.6474416072 -31 17 12.888570012   13.303 12.441 12.103 11.295 G3 8 0
44 CD-33 10685 Or* 15 45 12.8678037432 -34 17 30.644403036 12.47 11.56 10.224 9.60 8.685 K3Ve 306 1
45 2MASS J15453231-3249365 TT* 15 45 32.3170826352 -32 49 36.483119256           G9 2 0
46 2MASS J15453528-3208496 TT* 15 45 35.2827013320 -32 08 49.516700676   13.35 11.43     K3 4 0
47 V* KW Lup TT* 15 45 47.6002137432 -30 20 55.746457152   10.34 9.37   7.956 K2V 77 0
48 2MASS J15460529-2920531 TT* 15 46 05.2986550656 -29 20 53.115293184     13.46     M0 11 0
49 CD-27 10549 TT* 15 46 10.7394420672 -28 04 23.422218024   9.57 8.89     K0IV 15 0
50 RX J1546.7-3210 TT* 15 46 46.6441236336 -32 10 00.625119024           M2 7 0
51 CD-28 11578 TT* 15 48 02.9241919992 -29 08 36.999862764   11.56 10.78   9.861 G9IV 24 0
52 2MASS J15485739-3045043 TT* 15 48 57.3869126640 -30 45 04.369169088     15.28     M2 3 0
53 CD-30 12558 TT* 15 49 02.7149736240 -31 02 53.785935780   11.91 11.029   9.961 K0IVe 13 0
54 CD-25 11113 TT* 15 49 20.9990795520 -26 00 06.318844236   11.78 11.116   9.727 K1IVe 33 0
55 2MASS J15500499-2311537 Y*? 15 50 04.9796262288 -23 11 53.716923132       13.1   M2 14 0
56 HD 141618 * 15 50 56.4122254920 -25 34 19.038247716   10.28 9.74 9.4   G0/2 29 0
57 RX J1551.1-2402 Or* 15 51 06.6015760608 -24 02 19.119444468   15.08 14.465 13.5 12.057 ~ 30 0
58 2MASS J15512684-3131008 TT* 15 51 26.8518585360 -31 31 00.791235984           M1 3 0
59 HD 141813 Ro* 15 51 54.3941203488 -26 22 05.492011980   10.06 9.517   8.727 G8/K2III+F/G 22 0
60 RX J1552.5-3224B TT* 15 52 29.9447068440 -32 24 13.602957876           M3 2 0
61 RX J1552.5-3224 ** 15 52 29.99808 -32 24 13.4784   16.345 15.268 14.384   M3.5 6 0
62 RX J1552.5-3224A TT* 15 52 30.1450262160 -32 24 13.218729732           M2 2 0
63 2MASS J15523122-2633529 Or* 15 52 31.2274758072 -26 33 52.943626440   13.1       M0 14 0
64 RX J1554.0-2920 TT* 15 54 03.573744 -29 20 15.54720   13.908 12.542 12.166   M0 14 0
65 HD 142361 TT* 15 54 59.8695458688 -23 47 18.180029616   9.68 8.960   8.092 G3V 74 0
66 2MASS J15550624-2521102 Or* 15 55 06.2325059976 -25 21 10.578301020   13.5       M1 16 0
67 ScoPMS 8b TT* 15 55 17.0367971424 -23 22 16.607750088       14.55   M2.5Ve 24 0
68 ScoPMS 8a TT* 15 55 18.756864 -23 22 07.29624       14.92   M4Ve 10 1
69 UCAC2 17519615 TT* 15 55 26.2194715296 -33 38 23.285843664 14.51 13.58 12.45 11.74 11.05 K5 23 0
70 LP 916-45 PM* 15 55 36.8879445024 -32 00 00.410103360   15.40 14.00 13.57 11.02 M2 17 0
71 HD 142506 TT* 15 55 48.8220082584 -25 12 24.119074116   11.134 10.274 10.252 9.52 G8V 41 0
72 RX J155629.3-234821 BY* 15 56 29.4191882513 -23 48 19.828475536           M1.5V 29 0
73 V* V1145 Sco BY* 15 56 54.9804295680 -23 29 47.766299604           M3V 23 0
74 RX J1557.3-2529 TT* 15 57 16.743336 -25 29 19.31604   14.127 12.680 12.297 10.84 M0 26 0
75 RX J155720.1-233847 Or* 15 57 19.9921604088 -23 38 49.968268224           M0V 29 0
76 V* V1147 Sco TT* 15 57 25.744032 -23 54 22.30020   15.64 13.90 13.47   M0.5V 27 0
77 V* V1148 Sco BY* 15 57 34.3068411912 -23 21 12.268691748         11.27 M1IVe 47 0
78 RX J1557.8-2305 Or* 15 57 50.0330824392 -23 05 09.511498176       12.7   ~ 34 0
79 RX J1558.1-2405 mul 15 58 06.5 -24 05 14           ~ 5 0
80 RX J1558.1-2405B TT* 15 58 06.8718616992 -24 05 57.864070392       15.98 13.77 ~ 6 0
81 RX J1558.1-2405A Or* 15 58 08.1494972352 -24 05 53.000227680   13.47 12.23 12.00 10.94 K4 17 0
82 CD-23 12602 TT* 15 58 12.7076690664 -23 28 36.528700008   11.16 10.36 9.9   G9V 54 0
83 RX J1558.5-2512 Y*O 15 58 53.5260568728 -25 12 33.484470444           M1 19 0
84 2MASS J15591452-2606182 TT* 15 59 14.5149101712 -26 06 18.428408244       12.05   K2 17 0
85 2MASS J15593661-3255340 TT* 15 59 36.6165416352 -32 55 34.131406440           G8 3 0
86 2MASS J15594989-2555584 Or* 15 59 49.8890750184 -25 55 58.549443744   14.3     12.01 M2 22 0
87 V* V1150 Sco Or* 15 59 59.9527097064 -22 20 36.759121188     11.99   10.90 M1V 40 0
88 CD-24 12445 Or* 16 00 00.7745908992 -25 09 42.394617612   11.07 10.50     G0 31 0
89 2MASS J16001330-2418106 Or* 16 00 13.3003897920 -24 18 10.678264560   14.6   13.1   M0.5e 31 0
90 RX J1600.5-2027 TT* 16 00 31.3480737649 -20 27 04.999094488   14.8     11.16 M1 27 0
91 TYC 6212-1183-1 Or* 16 00 40.5646027152 -22 00 32.231715588   12.259 11.213 11.016 9.931 G9 49 0
92 RX J1600.7-2127 TT* 16 00 42.7696857312 -21 27 38.014214220   14.2 12.941 11.7 11.109 K7 28 0
93 RX J1600.7-2343 TT* 16 00 44.650608 -23 43 14.71620   17.294 15.573 15.069   M2 19 0
94 V* V1151 Sco Or* 16 01 05.1852470424 -22 27 31.320270432   15.23 13.69 13.38 11.14 M3Ve 37 0
95 RX J1601.1-2113 Or* 16 01 08.0169370824 -21 13 18.555249216   13.9 12.511 12.0 10.785 M0 35 0
96 HD 143441 TT* 16 01 18.4205701824 -26 52 21.437739696   10.26 9.453   8.594 G2IV 38 0
97 CD-22 11298 Or* 16 01 25.6301810064 -22 40 40.289030832   13.02 13.44     K1IV 75 0
98 RX J1601.7-2049 Or* 16 01 47.4388749576 -20 49 45.748969788   14.3     10.87 M0 34 0
99 2MASS J16015149-2445249 TT* 16 01 51.4903649252 -24 45 25.061980436   13.4       K7 25 0
100 BD-19 4288 TT* 16 01 58.2155255520 -20 08 11.954643036   11.58 10.501 9.9 9.275 G9IV(e) 47 0
101 RX J1602.0-2221 TT* 16 02 00.3949060416 -22 21 23.842479852   14.9 13.591 12.8 11.265 M1.0e 47 0
102 V* V1153 Sco Or* 16 02 08.4542714448 -22 54 59.082274404           M1V 34 0
103 V* V1154 Sco Or* 16 02 10.4340916128 -22 41 28.824128520   12.46 11.32 10.96   K5+K5 56 0
104 RX J1602.8-2401B Or* 16 02 51.1649651376 -24 01 50.297892708         14.65 M7-8 41 0
105 RX J1602.8-2401 Or* 16 02 51.2266141056 -24 01 57.465435864   13.81 12.58 12.01 10.79 K4 42 0
106 RX J1602.9-2022 TT* 16 02 53.962800 -20 22 48.00216   13.861 12.442 12.207 10.503 K5V 29 0
107 NAME Lupus Complex SFR 16 03 -38.1           ~ 851 0
108 CD-22 11315 TT* 16 03 35.4984951600 -22 45 56.119524588   11.94 10.969 10.6 9.784 G9 43 0
109 RX J1603.9-2031B TT* 16 03 54.9656958000 -20 31 38.559952200   14.0 13.205 12.20 10.932 M0 31 0
110 RX J1603.9-2031 TT* 16 03 57.6711677256 -20 31 05.604697272   13.4   11.73 10.92 K5 75 0
111 RX J160421-21307 TT* 16 04 20.9770582632 -21 30 41.699268144   16.6     11.99 M2 34 0
112 ATO J241.0901-21.5080 Or* 16 04 21.6547947840 -21 30 28.550063304   13.3       K2 190 0
113 ScoPMS 27 Or* 16 04 47.7531686256 -19 30 22.916271132   12.43 11.254   9.822 K3IVe 59 0
114 ScoPMS 28 TT* 16 05 27.2683550136 -19 38 46.707624132     14.05     M1V 27 0
115 CRTS J160539.3-215233 Or* 16 05 39.3660891144 -21 52 33.834450432   15.8 13.13 13.6   M3.5 21 0
116 ScoPMS 29 TT* 16 05 42.6751395912 -20 04 15.244538304           M2V 25 0
117 RX J1606.2-2036 TT* 16 06 12.5411330016 -20 36 47.292443280   14.0 12.737 12.5 10.838 K5 31 0
118 ScoPMS 31 TT* 16 06 21.9398106936 -19 28 44.802473268     13.47     M0.5V 56 0
119 RX J1606.6-2108 Y*O 16 06 37.408608 -21 08 40.49016   15.822 14.177 13.395   ~ 10 0
120 ScoPMS 32 TT* 16 06 39.9043527312 -20 01 28.188399432           M3V 27 0
121 RX J1607.0-2036 Or* 16 07 03.5541108312 -20 36 26.875993608   13.54 12.232 11.75 10.334 M0 24 1
122 2MASS J16070373-2043074 TT* 16 07 03.7301834304 -20 43 07.427479872   16.0 14.51 13.6   M1 22 0
123 RX J1607.0-1911 TT* 16 07 03.9381893688 -19 11 33.973928988     14.207   11.782 M1 32 0
124 RX J1610.3-1904 TT* 16 10 21.7424768952 -19 04 06.590282484           M1V 39 0
125 GSC 06209-00982 TT* 16 10 28.570872 -19 04 46.89804   15.623 13.957 13.584   M3V 39 0
126 Wa Oph 1 Or* 16 11 08.9057560608 -19 04 46.976720052     12.073   10.194 K2IV(e) 75 0
127 ScoPMS 45 Or* 16 11 20.5774543272 -18 20 55.035502656     12.49     K5IV 44 0
128 ScoPMS 46 TT* 16 11 29.7978634992 -18 50 54.287569284           M4IV 16 0
129 Wa Oph 2 Or* 16 11 59.2702332696 -19 06 53.316517068     11.66 11.57   K2Ve 74 0
130 NAME Upper Sco Association As* 16 12 -23.4           ~ 1586 1
131 ScoPMS 51 Or* 16 12 20.9256673824 -19 09 04.111085808     15.10     M2.5V 33 0
132 BD-18 4244 Or* 16 12 40.5144406080 -18 59 28.267620432   12.15 10.829   9.235 K0IV(e) 97 0
133 NAME Upper Sco-Cen As* 16 15 -24.2           ~ 1497 1
134 HD 146516 TT* 16 17 31.3909720200 -23 03 36.123102792     10.143   9.130 G7V 57 0
135 * rho Oph ** 16 25 35.11766 -23 26 49.8150 4.30 4.85 4.63 4.27 3.96 B2IV+B2V 670 0
136 BD-21 4369 Or* 16 29 48.6927879432 -21 52 11.928822636   12.54 11.315   9.740 K2IVe 53 0
137 NAME Upper Scorpius A As* ~ ~           ~ 16 0
138 NAME Upper Scorpius B As* ~ ~           ~ 12 0

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