2001A&A...368..122G

Query : 2001A&A...368..122G

2001A&A...368..122G - Astronomy and Astrophysics, volume 368122-136 (2001/3-2)

High-mass binaries in the very young open cluster NGC 6231. Implication for cluster and star formation.

GARCIA B. and MERMILLIOD J.C.

Abstract (from CDS):

New radial-velocity observations of 37 O- and B stars in the very young open cluster NGC 6231 confirm the high frequency of short-period spectroscopic binaries on the upper main sequence. Among the 14 O-type stars, covering all luminosity classes from dwarfs to supergiants, 8 are definitively double-lined systems and all periods but one are shorter than 7 days. Several additional binaries have been detected among the early B-type stars. NGC 6231 is an exceptional cluster to constrain the scenarios of cluster- and binary-star formation over a large range of stellar masses. We discuss the evidences, based on NGC 6231 and 21 other clusters, with a total of 120 O-type stars, for a clear dichotomy in the multiplicity rate and structure of very young open clusters containing O-type stars in function of the number of massive stars. However, we cannot answer the question whether the observed characteristics result from the formation processes or from the early dynamical evolution.

Abstract Copyright: ∼

Journal keyword(s): galaxies: open clusters and associations: individual: NGC 6231 - stars: binaries: spectroscopic - stars: early-type - stars: rotation

Nomenclature: Table 1, col(3): Cl* NGC 6231 SBL NNN (Nos 853-858) added.

CDS comments: Table 5: stars IC 1590 NNN not identified.

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 - 2026 		#notes
1 IC 1590 OpC 00 52 49.2 +56 37 42           ~ 70 0
2 HD 5005 ** 00 52 49.21342 +56 37 39.5227 7.02         ~ 147 0
3 IC 1805 OpC 02 32 52.1 +61 28 36           ~ 542 1
4 HD 17505 ** 02 51 07.97514 +60 25 03.8720 6.83 7.47 7.07     O6.5III((f))n+O8V 205 0
5 HD 17520 ** 02 51 14.4527711976 +60 23 10.057239852 7.86 8.54 8.24 7.96 7.73 O9.2Ve+O8Vz 151 0
6 IC 1848 OpC 02 51 19.4 +60 25 32   6.87 6.5     ~ 522 2
7 HD 25638 EB* 04 07 49.2849421032 +62 19 58.626896088 6.82 7.26 6.93     O9.5Vn 227 1
8 NGC 1502 OpC 04 07 49.4 +62 19 35   7.47 6.9     ~ 202 1
9 HD 25639 * 04 07 51.3928669512 +62 19 48.385984944 6.87 7.24 6.86     B0III 130 0
10 * tet01 Ori A Ae* 05 35 15.8254015008 -05 23 14.334699480 5.87 6.75 6.73 6.42 6.21 B0V 508 0
11 * tet01 Ori C SB* 05 35 16.4662967280 -05 23 22.921811880 4.20 5.15 5.13 4.91 4.73 O7Vp 1479 1
12 M 42 HII 05 35 16.8 -05 23 15           ~ 4411 0
13 NAME Ori A MoC 05 38 -07.1           ~ 3187 0
14 NGC 2244 OpC 06 32 06.9 +04 54 19           ~ 673 1
15 NGC 2264 OpC 06 40 53.7 +09 52 32           ~ 1876 0
16 * 15 Mon Be* 06 40 58.65963 +09 53 44.7229 3.360 4.45 4.68   4.88 O7V+B1.5/2V 823 0
17 NGC 2362 OpC 07 18 41.9 -24 57 08           ~ 428 0
18 * tau CMa SB* 07 18 42.4849951654 -24 57 15.700749738 3.26 4.25 4.40 4.44 4.62 O9II 439 0
19 Cl Trumpler 14 OpC 10 43 56.0 -59 33 07   5.70 5.5     ~ 547 0
20 Cl Collinder 228 OpC 10 44 00 -60 05.2           ~ 211 0
21 Cl Trumpler 16 OpC 10 45 01.9 -59 42 00           ~ 510 0
22 IC 2944 OpC 11 38 20.00 -63 22 22.0           ~ 191 0
23 Cl Stock 16 OpC 13 19 26.4 -62 37 19           ~ 95 0
24 NGC 6193 OpC 16 41 14.9 -48 46 47           ~ 169 0
25 HD 150135 * 16 41 19.4443334664 -48 45 47.568769200 6.19 7.00 6.88 7.33   O6.5V((f))z 130 0
26 HD 150136 SB* 16 41 20.4155898816 -48 45 46.730465028 4.98 5.78 5.65 6.93   O3.5-4III(f*)+O6IV 201 0
27 CD-41 10989 Y*O 16 53 06.0620888688 -41 53 18.640540572 11.12 11.55 11.08     B0:IV/V 15 0
28 HD 152076 Y*O 16 53 07.3002035928 -41 43 45.479256528 7.98 9.10 8.90 9.36   B0III 57 0
29 NGC 6231 723 SB* 16 53 07.3957269240 -41 53 31.238667924 11.643 11.896 11.435   10.736 B3:V 8 0
30 CD-41 10990 Y*? 16 53 08.1765406224 -41 47 12.008007996 10.76 11.19 10.852   10.326 B1V 13 0
31 NAME Sco OB 1 As* 16 53.5 -41 57           ~ 222 0
32 HD 326327 Be* 16 53 39.0780958656 -41 47 48.021660096 9.372 9.969 9.729 10.03 9.312 B1.5Ve 56 0
33 HD 152182 Y*? 16 53 41.4737243208 -41 19 40.121593320 8.48 10.18 9.96     B1II 39 0
34 HD 326328 SB* 16 53 45.5874473424 -41 49 09.633232164 9.792 10.382 10.213   9.857 B3 41 0
35 HD 152200 SB* 16 53 51.6564464880 -41 50 32.716447224 7.744 8.488 8.391 9.31 8.152 O9.7IV(n) 73 0
36 V* V945 Sco bC* 16 53 54.5203569984 -41 52 14.960561412 9.090 9.745 9.575 9.618 9.260 B1V 45 0
37 HD 152219 SB* 16 53 55.6078109256 -41 52 51.496403268 6.950 7.705 7.569   7.267 O9.5III(n) 114 0
38 V* V1293 Sco SB* 16 53 57.5918059848 -41 38 41.669125044 9.39 10.3 10.2     B1.5:V 26 0
39 V* V1032 Sco bC* 16 53 58.6055666592 -41 48 41.790648132 9.327 9.920 9.767 9.811 9.445 B2V 42 0
40 HD 152235 s*b 16 53 58.8528412848 -41 59 39.577848180 6.47 6.92 6.38 5.84 5.42 B0.5Ia 205 0
41 HD 152218 Y*O 16 53 59.9905195488 -41 42 52.817214240 7.02 7.78 7.570   7.243 O9IV+B0:V: 160 0
42 CPD-41 7712 Y*? 16 54 00.3929167800 -41 52 43.523646564 8.607 9.298 9.158   8.838 B1V 35 0
43 V* V946 Sco bC* 16 54 01.7631666120 -41 51 11.868345252 9.890 10.471 10.281 10.327 9.927 B2IV-V 49 0
44 HD 152234 s*b 16 54 01.8373785611 -41 48 22.987399147 4.92 5.64 5.45     B0.5Ia 201 0
45 Cl* NGC 6231 SBL 314 Y*? 16 54 02.9094531408 -41 47 25.519208028 8.909 9.486 9.275   8.967 ~ 7 0
46 HD 152233 SB* 16 54 03.5909222280 -41 47 29.841281484 5.93 6.72 6.59     O6II(f) 202 0
47 CD-41 11030 SB* 16 54 05.0795262120 -41 50 06.929151792 8.924 9.575 9.457   9.201 B1V 49 0
48 CPD-41 7722 SB* 16 54 06.5922330576 -41 44 26.398570380 9.586 10.178 10.017   9.700 B1V 19 0
49 CD-41 11048 Y*O 16 54 06.7112222064 -41 50 07.105056468 8.903 9.541 9.421   9.161 B1V 40 0
50 CD-41 11027A Y*? 16 54 06.7182176904 -41 51 06.979097448 8.108 8.848 8.720   8.439 O9.7V 34 0
51 CD-41 11032 SB* 16 54 06.9496123464 -41 49 23.360333088 8.93 9.60 9.512 10.81 9.256 B0.5V 42 0
52 CD-41 11031 Y*? 16 54 07.5342145320 -41 44 40.655325588 9.443 10.051 9.887   9.566 B0V 29 0
53 HD 326340 Y*? 16 54 09.0228207192 -41 58 00.563537352 9.536 10.146 9.930 10.11 9.500 B5 32 0
54 CPD-41 7727 SB* 16 54 09.2737061088 -41 48 41.072216580 8.964 9.564 9.424   9.134 B1V 40 0
55 HD 152248 Y*O 16 54 10.0618206816 -41 49 30.139291596 5.56 6.15 6.088     O7Iabf+O7Ib(f) 270 0
56 NGC 6231 374 Y*? 16 54 10.9603526328 -41 49 39.103879044   10.373 10.157 10.66 9.813 ~ 15 0
57 CD-41 11034 Y*? 16 54 11.3119116264 -41 48 53.965557072 8.878 9.546 9.335 9.744 8.943 B1V 45 0
58 HD 152249 s*b 16 54 11.6395658856 -41 50 57.295111524 5.91 6.65 6.45     OC9Iab 254 0
59 HD 326329 Y*O 16 54 14.1033282720 -41 50 08.503512720 8.141 9.183 9.013 9.477 8.460 O9.7V 78 0
60 CPD-41 7734 Y*? 16 54 14.2460503200 -41 55 01.326705420 10.103 10.616 10.331 10.25 9.801 B0Vn 29 0
61 NGC 6231 OpC 16 54 14.4 -41 48 53           ~ 562 0
62 CD-41 7736 Pu* 16 54 15.7425941640 -41 49 32.321424612 9.859 10.400 10.174 10.14 9.780 B1Vn 33 0
63 CPD-41 7737 Y*? 16 54 16.3028817696 -41 50 26.660630976 10.456 10.955 10.745 10.71 10.387 B1V 24 0
64 V* V964 Sco bC* 16 54 18.3200772432 -41 51 35.651104416 9.126 9.776 9.603 9.61 9.290 B0.5V 63 0
65 HD 326339 Y*? 16 54 19.3229318352 -41 57 30.961268928 10.136 10.501 10.108   9.505 B3 27 0
66 HD 152270 WR* 16 54 19.6991292072 -41 49 11.531710092 6.26 6.80 6.597 6.72 6.39 WC7+O5-8 315 0
67 CD-41 11042 Y*O 16 54 19.8364084848 -41 50 09.378605616 7.733 9.02 8.80 9.23 7.859 O9.5IV 108 0
68 V* V1208 Sco Y*O 16 54 21.3090092232 -41 51 41.766233904 9.293 9.91 9.708 9.96 9.344 B0-2V 52 0
69 HD 326331 SB* 16 54 25.9691286216 -41 49 55.768191852 6.886 7.678 7.497   7.143 O8IVn((f)) 87 0
70 HD 326319 * 16 54 31.1403111648 -41 38 40.715436876   10.94 10.58     A0 15 0
71 HD 152314 ** 16 54 32.0048577720 -41 48 18.848961036 7.256 7.974 7.749 9.01 7.446 O9IV 113 0
72 HD 326332 Y*O 16 54 35.8130819496 -41 50 12.216189984 9.275 9.903 9.669 9.96 9.275 B2IVe+ 54 0
73 V* V947 Sco bC* 16 54 36.0500878224 -41 53 38.119259292 9.45 10.06 9.78 10.06   B1V 53 0
74 CPD-41 7755 Y*? 16 54 39.8785805856 -41 53 38.480359596 9.675 10.273 10.068 11.4 9.705 B1V 39 0
75 HD 326317 Y*O 16 54 41.2161553920 -41 39 01.815871968 9.72 10.4 10.2     B2 24 0
76 V* V920 Sco bC* 16 54 43.1657949576 -41 49 35.456774916 9.153 9.795 9.601 9.95 9.256 B1V 67 0
77 NGC 6231 143 * 16 54 47.7933503280 -41 50 35.050621848 15.441 14.974 14.410   13.662 ~ 5 0
78 CD-41 11062 ** 16 54 50.35416 -42 01 26.6952 9.47 9.941   9.800   B2V 20 0
79 HD 152560 * 16 55 55.2053721480 -41 01 30.500346108 7.49 8.23 8.10 9.13   O9.5IV 53 0
80 HD 152623 ** 16 56 15.0265311912 -40 39 35.892252936 5.95 8.70 8.64 7.68   O7V(n)((f))z 113 0
81 Cl Trumpler 24 OpC 16 57 00 -40 40.0     8.6     ~ 74 0
82 NGC 6383 OpC 17 34 41.6 -32 34 27           ~ 168 0
83 HD 159176 Be* 17 34 42.4921337376 -32 34 53.995451196 4.88 5.74 5.70 7.19   O7V 261 0
84 Cl Trumpler 27 OpC 17 36 20 -33 31.0   8.24 6.7     ~ 100 1
85 M 20 OpC 18 02 42 -22 58.3           ~ 456 1
86 NGC 6604 OpC 18 18 03 -12 14.5           ~ 146 0
87 HD 167971 s*b 18 18 05.8947362832 -12 14 33.313601112 7.89 8.27 7.50 6.68 6.279 O8Iaf(n)+O4/5 324 0
88 M 16 OpC 18 18 45.1 -13 47 31           ~ 1084 1
89 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1700 0
90 HD 344782 * 19 43 08.8700740320 +23 18 08.194127868 10.34 10.86 10.33 10.13   O9.5V 22 0
91 HD 344784 * 19 43 10.9730324664 +23 17 45.364272000 9.38 9.86 9.37 9.378   O6.5V((f)) 100 0
92 NGC 6823 OpC 19 43 11.3 +23 18 32   7.71 7.1     ~ 279 2
93 HD 190918 WR* 20 05 57.3244526328 +35 47 18.150756792 6.11 6.88 6.75     WN5+O9I 385 0
94 NGC 6871 OpC 20 06 07.9 +35 46 45   5.43 5.2     ~ 237 0
95 IC 1396 OpC 21 38 51.4 +57 31 52           ~ 523 1
96 HD 206267 Y*O 21 38 57.6195772032 +57 29 20.554016280 5.09 5.83 5.62   5.56 O6.0V((f))+O9:V 520 0
97 HD 215835 SB* 22 46 54.1107754872 +58 05 03.533752788 8.24 8.85 8.629   8.049 O5.5V((f))+O6V((f)) 260 0
98 NGC 7380 OpC 22 47 23.4 +58 06 55           ~ 198 0

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