2001A&A...379..147D


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.12CEST01:55:21

2001A&A...379..147D - Astronomy and Astrophysics, volume 379, 147-161 (2001/11-3)

Visual binaries among high-mass stars. An adaptive optics survey of OB stars in the NGC 6611 cluster.

DUCHENE G., SIMON T., EISLOEFFEL J. and BOUVIER J.

Abstract (from CDS):

We have searched for visual binaries with projected separations in the range 200-3000AU (0.1"-1.5") among a sample of 96 stars in the massive young NGC 6611 cluster, 60 of them being subsequently identified as high probability cluster members of mainly OB spectral type. This is the first visual binary survey among such a large and homogeneous sample of high-mass stars. We find an uncorrected binary frequency of 18±6% over the surveyed separation range. Considering only binaries with mass ratios q≥0.1, we find that OB stars in NGC 6611 host more companions than solar-type field stars. We derive mass ratios for the detected binaries from their near-infrared flux ratios and conclude that about half of the detected binaries have q≲0.2, which does not contradict the assumption that companion masses are randomly drawn from the initial mass function. There is no evidence in our sample that wide-binary properties depend upon the mass of the primary star. The high frequency of massive binaries in a cluster as rich as NGC 6611 and the lack of a strong mass dependence of their properties are difficult to reconcile with the scenario whereby massive stars form as the result of mergers of smaller stars. The canonical protostellar accretion scenario together with cloud fragmentation, on the other hand, can naturally explain most of the observed binary properties, although the very high stellar density in the protocluster is likely to require significant modification to that picture as well.

Abstract Copyright:

Journal keyword(s): stars: binaries: visual - stars: formation - stars: early-type - Galaxy: open clusters and associations: individual: NGC 6611

Simbad objects: 98

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Number of rows : 98

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 2MASS J18180928-1346545 Y*O 18 18 09.2844761854 -13 46 54.555135927 14.410 13.963 12.837   11.292 B0.5V 18 0
2 NGC 6611 114 * 18 18 25.37 -13 50 01.7   16.889 16.111     ~ 4 0
3 BD-13 4920 Y*O 18 18 26.1967302719 -13 50 05.482808223 11.068 10.55 10.06   9.236 B1V 38 0
4 NGC 6611 136 * 18 18 27.58 -13 50 13.0   16.779 15.938     ~ 4 0
5 BD-13 4921 * 18 18 29.9553395208 -13 49 57.614738405 9.81 10.41 9.91     B0.5V 47 0
6 NGC 6611 162 * 18 18 31.7093376885 -13 49 45.969699675   16.023 15.271     ~ 4 0
7 LS IV -13 14 Y*O 18 18 32.2228577379 -13 48 48.056921842 11.343 11.024 10.296 10.38 9.430 OB 44 0
8 BD-13 4923 Y*O 18 18 32.7311931259 -13 45 11.869241832 11.184 10.85 10.08 10.04 8.529 O4V((f+))+O7.5V 51 0
9 2MASS J18183284-1345046 Y*O 18 18 32.8480232913 -13 45 04.601243914   16.397 15.292     ~ 5 0
10 NGC 6611 181 * 18 18 33.2117038709 -13 45 08.027406426 15.06 15.18 14.32     B1.5Ve 11 0
11 NGC 6611 182 * 18 18 33.61 -13 49 05.1   17.118 16.291     ~ 3 0
12 2MASS J18183371-1340588 Y*O 18 18 33.7215297707 -13 40 58.855809698 14.44 14.604 13.019   10.864 B0V 16 0
13 [HMS93] J181836.06-134513.3 Em* 18 18 35.91 -13 45 13.4   15.2 14.40     A0 12 0
14 HD 168075 SB* 18 18 36.0420462726 -13 47 36.450104043 8.62 9.22 8.77 9.45   O7V(n)((f))z 133 0
15 NGC 6611 198 * 18 18 36.07 -13 47 58.4 13.74 13.8 13.21     Ae 9 0
16 HD 168076 ** 18 18 36.4221548165 -13 48 02.462547922 8.12 8.72 8.25 7.62 7.21 O4III(f) 184 0
17 2MASS J18183658-1345323 Y*O 18 18 36.5877818132 -13 45 32.402077854 17.992 16.988 15.927   14.434 ~ 9 0
18 NGC 6611 207 Em* 18 18 36.7392999676 -13 47 33.071207376 12.32 12.57 12.05     B1Ve 23 0
19 NGC 6611 210 * 18 18 36.9748062496 -13 47 52.765515669 11.23 12.03 11.47     B1V 25 0
20 NGC 6611 213 Em* 18 18 37.0565721042 -13 45 29.508027702 16.932 15.701 14.043   12.05 B 18 0
21 NGC 6611 221 Em* 18 18 37.6379607593 -13 45 13.224072692 16.771 15.651 14.463   12.789 B8Ve 15 0
22 NGC 6611 223 * 18 18 37.8649107820 -13 46 35.152244595 11.44 11.80 11.06     B1V 30 0
23 2MASS J18183788-1346293 Y*O 18 18 37.8865345175 -13 46 29.433900050 17.496 16.358 14.800   12.884 ~ 9 0
24 NGC 6611 226 * 18 18 38.03 -13 45 34.8   16.845 15.876     ~ 5 0
25 NGC 6611 227 Em* 18 18 38.4018455003 -13 47 09.064567030 13.18 13.487 12.753   11.792 B1.5Ve 28 0
26 NGC 6611 229 * 18 18 38.4652826349 -13 46 55.745059625   17.249 16.195     ~ 5 0
27 2MASS J18183846-1345561 Y*O 18 18 38.4653963963 -13 45 56.221251553 13.875 12.34 11.78   11.406 B1V 26 0
28 EM* MWC 916 Ae* 18 18 38.8197267356 -13 46 44.272682403 12.209 11.990 11.127   9.598 Be 26 0
29 NGC 6611 240 * 18 18 39.50 -13 49 14.8   13.15 12.60     B 9 0
30 NGC 6611 243 Em* 18 18 39.7527358775 -13 46 56.378183623 14.979 14.453 13.705   12.728 B8Ve 19 0
31 2MASS J18184006-1344555 Y*O 18 18 40.0704728418 -13 44 55.817637582 19.281 17.903 16.129   13.888 ~ 6 0
32 NGC 6611 245 Em* 18 18 40.0882611299 -13 47 00.854379079 15.334 14.431 13.512   12.225 A0 19 0
33 BD-13 4927 Y*O 18 18 40.0942827811 -13 45 18.605446597 10.12 10.14 9.48 9.71   O7II(f) 69 0
34 NGC 6611 252 * 18 18 40.61 -13 47 44.5   14.7 13.90   12.708 F5 7 0
35 LS IV -13 19 Y*O 18 18 40.7577738585 -13 46 52.033750439 10.84 11.27 11.00     B1V 38 0
36 NGC 6611 257 * 18 18 40.96 -13 47 38.0   16.79 15.588   14.161 ~ 6 0
37 2MASS J18184096-1345296 Y*O 18 18 40.9652227360 -13 45 29.645772336 12.01 11.85 11.05     B0.5V 25 0
38 NGC 6611 258 * 18 18 41.16 -13 48 21.1   16.31 15.425     ~ 5 0
39 NGC 6611 260 * 18 18 41.43 -13 49 05.0   15.07 14.37     ~ 4 0
40 [HMS93] J181841.60-134840.6 Em* 18 18 41.55 -13 48 39.9 14.55 14.39 13.58     Ae 13 0
41 NGC 6611 266 Em* 18 18 41.5799644201 -13 46 30.924832113 16.711 15.701 14.267   12.510 G 16 0
42 NGC 6611 267 Em* 18 18 41.6930813926 -13 46 43.855057430 13.43 13.63 13.07     B3V 15 0
43 2MASS J18184201-1347139 Y*? 18 18 42.012 -13 47 13.96 17.407 16.495 15.545     ~ 7 0
44 NGC 6611 275 * 18 18 42.1891026578 -13 46 52.018212147 12.19 12.51 11.96     B1.5V 19 0
45 NGC 6611 273 Em* 18 18 42.249 -13 47 30.49 15.731 14.915 14.113   13.065 A0 16 0
46 2MASS J18184247-1348469 Y*O 18 18 42.4816568144 -13 48 47.037942769   14.39 13.58   12.744 B 13 0
47 BD-13 4928 Be* 18 18 42.7761947209 -13 46 50.971213503 10.05 10.604 10.044 10.23 9.345 OB- 56 0
48 NGC 6611 281 Em* 18 18 42.8896760546 -13 46 42.653839568 14.58 14.39 13.80     Ae 12 0
49 NGC 6611 285 * 18 18 43.35 -13 48 44.5   15.921 15.105     ~ 5 0
50 NGC 6611 297 Em* 18 18 44.5245946434 -13 45 48.121858979 13.34 13.55 12.85     B1.5:V 25 0
51 2MASS J18184465-1347563 Y*O 18 18 44.659 -13 47 56.33 12.589 12.350 11.718   10.947 B1.5V 25 0
52 NGC 6611 290 * 18 18 44.8426904562 -13 56 22.342076400 12.24 12.46 11.69     B2.5V 15 0
53 NGC 6611 305 * 18 18 44.98 -13 45 24.6 14.54 14.67 13.56     B1V 16 0
54 NGC 6611 301 * 18 18 44.9817098254 -13 46 24.897570778 12.5 12.76 12.16     B2V 23 0
55 NGC 6611 306 Em* 18 18 45.0318300168 -13 45 41.023824157 13.23 13.35 12.72     B1.5Ve 25 0
56 NGC 6611 300 Em* 18 18 45.0400144488 -13 47 47.176114780 13.642 13.276 12.607   11.787 B1.5Ve 24 0
57 NGC 6611 299 Ae* 18 18 45.0878297242 -13 49 19.483387535 16.068 15.211 14.313   13.359 A3/5 17 0
58 NGC 6611 307 Em* 18 18 45.2536252940 -13 47 20.400859646 15.12 15.16 14.10     B1.5Ve 16 0
59 2MASS J18184531-1346402 Y*O 18 18 45.3162968726 -13 46 40.246224522 18.245 17.021 15.387   13.501 ~ 8 0
60 NGC 6611 311 Em* 18 18 45.60 -13 47 53.1 13.4 13.30 12.74     B2.5Ve 20 0
61 Cl* NGC 6611 BKP 29797 * 18 18 45.83 -13 55 58.6   17.34 16.025     ~ 2 0
62 BD-13 4929 Y*O 18 18 45.8494579251 -13 46 30.890546461 10.05 10.509 10.23 10.02 8.830 O7V+B0.5V+B0.5V: 57 0
63 NGC 6611 313 * 18 18 46.1329444513 -13 49 23.438747806   12.11 11.60     B5III 20 0
64 NGC 6611 321 * 18 18 46.55 -13 46 34.1   16.288 15.325     ~ 5 0
65 NGC 6611 322 Em* 18 18 46.602 -13 46 59.87 14.39 14.3 13.68     B8V:e 13 0
66 NGC 6611 323 Em* 18 18 46.7448222652 -13 47 48.699218202 13.84 14.01 13.44     B5Ve 12 0
67 M 16 OpC 18 18 48 -13 48.4   6.58 6.0     ~ 959 2
68 NGC 6611 335 * 18 18 48.65 -13 46 29.1   17.44 16.57     ~ 4 0
69 NGC 6611 336 Em* 18 18 49.1681453055 -13 48 04.229176695 14.243 13.802 13.288   12.419 B5III 22 0
70 NGC 6611 339 Em* 18 18 49.2033147676 -13 46 54.302768227   14.64 13.75     ~ 11 0
71 NGC 6611 343 * 18 18 49.3759070917 -13 46 50.044905432 12.4 12.65 11.83     B1V 22 0
72 NGC 6611 349 * 18 18 50.5732420732 -13 47 33.952339826   13.01 11.61     G5III 16 0
73 LS IV -13 22 Em* 18 18 50.6843369633 -13 48 12.721541645 11.953 11.78 11.16   10.443 B1V 30 0
74 NGC 6611 355 * 18 18 51.20 -13 49 27.5   16.426 15.655     ~ 4 0
75 NGC 6611 353 * 18 18 51.2111876707 -13 50 02.194067778   17.387 16.553     ~ 3 0
76 NGC 6611 362 * 18 18 51.67 -13 46 55.6   16.935 15.892     ~ 5 0
77 2MASS J18185167-1347596 Y*O 18 18 51.6825321718 -13 47 59.688587406 17.010 15.892 14.530   12.809 ~ 9 0
78 NGC 6611 366 PM* 18 18 51.8917817425 -13 48 14.920077290   15.608 14.216     K 5 0
79 2MASS J18185208-1349293 Y*O 18 18 52.1000670679 -13 49 29.204884440   13.982 13.403   12.491 B7V 11 0
80 2MASS J18185267-1349427 Y*O 18 18 52.6748769663 -13 49 42.635131189 9.04 9.71 9.45   8.968 O9.7IIIp 93 0
81 NGC 6611 371 Em* 18 18 53.0132902999 -13 46 45.082078635 14.577 14.067 13.379   12.388 B0.5Ve 23 0
82 NGC 6611 374 Em* 18 18 53.2682517230 -13 46 07.184502756 15.529 14.406 13.347   11.968 F 19 0
83 NGC 6611 388 Em* 18 18 54.9467919593 -13 48 45.844647852   14.28 13.70     B 14 0
84 NGC 6611 396 Em* 18 18 55.5848817006 -13 48 44.550600429 16.369 15.305 13.965   12.326 G8 16 0
85 NGC 6611 400 Em* 18 18 55.8332914513 -13 46 54.059887172 14.248 13.493 12.789   11.770 B9III 23 0
86 NGC 6611 402 * 18 18 56.0607372784 -13 46 25.710124514   12.39 11.16     K0II 16 0
87 HD 168137 SB* 18 18 56.1894792010 -13 48 31.090538024 8.72 9.36 8.94 9.55   O8Vz 111 0
88 Cl* NGC 6611 BKP 29710 * 18 18 56.98 -13 48 50.7   16.413 14.928     ~ 3 0
89 V* QR Ser EB* 18 18 58.6905343193 -13 59 28.459499667 7.92 8.55 8.28 9.07   O9.5III+B3-5V/III 75 0
90 NGC 6611 455 Em* 18 19 02.8904669390 -13 47 17.652632778   12.65 12.05     A5II 16 0
91 NGC 6611 460 * 18 19 03.8621957929 -13 47 58.608234086   16.414 15.345     ~ 4 0
92 BD-13 4933 Be* 18 19 04.8785156526 -13 48 20.447211729 11.259 11.095 10.628   9.915 B0.5Vn 42 0
93 BD-13 4934 * 18 19 05.5681568592 -13 54 50.510251666 9.06 9.68 9.54     B1Vp 30 0
94 BD-13 4935 * 18 19 06.5055889794 -13 43 30.475077048 11.918 11.53 11.27   10.270 B3V 23 0
95 NGC 6611 487 * 18 19 07.0145523969 -13 43 39.208346438   15.882 14.953     ~ 4 0
96 NGC 6611 489 * 18 19 07.3229959386 -13 43 04.724423484   11.66 11.42     B8III 17 0
97 BD-13 4936 Ae* 18 19 11.0683719117 -13 56 43.088195038 9.73 10.281 9.763 10.27 8.824 B0/5e 49 0
98 LS IV -13 30 * 18 19 18.4807638608 -13 55 40.089502487 11.32 11.78 11.42     B1.5V 23 0

    Equat.    Gal    SGal    Ecl

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2021.04.12-01:55:21

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