2022A&A...658A..69B

Query : 2022A&A...658A..69B

2022A&A...658A..69B - Astronomy and Astrophysics, volume 658A69-69 (2022/2-1)

The observed multiplicity properties of B-type stars in the Galactic young open cluster NGC 6231.

BANYARD G., SANA H., MAHY L., BODENSTEINER J., VILLASENOR J.I. and EVANS C.J.

Abstract (from CDS):


Context. It is well known that massive O stars are frequently (if not always) found in binary or higher-order multiple systems, but this fact has been less robustly investigated for the lower mass range of the massive stars, represented by B-type stars. Obtaining the binary fraction and orbital parameter distributions of B-type stars is crucial to understand the impact of multiplicity on the archetypal progenitor of core-collapse supernovae as well as to properly investigate formation channels for gravitational wave progenitors.
Aims. This work aims to characterise the multiplicity of the B star population of the young open cluster NGC 6231 through multi-epoch optical spectroscopy of 80 B-type stars.
Methods. We analyse 31 FLAMES/GIRAFFE observations of 80 B-type stars, monitoring their radial velocities (RVs) and performing a least-squares spectral analysis (Lomb-Scargle) to search for periodicity in those stars with statistically significant variability in their RVs.
Results. We constrained an observed spectroscopic binary fraction of 33±5% for the B-type stars of NGC 6231, with a first order bias correction giving a true spectroscopic binary fraction of 52±8%. Out of 27 B-type binary candidates, we obtained orbital solutions for 20 systems: 15 single-lined (SB1) and five double-lined spectroscopic binaries (SB2s). We present these orbital solutions and the orbital parameter distributions associated with them.
Conclusions. Our results indicate that Galactic B-type stars are less frequently found in binary systems than their more massive O-type counterparts, but their orbital properties generally resemble those of B- and O-type stars in both the Galaxy and Large Magellanic Cloud.

Abstract Copyright: © ESO 2022

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

VizieR on-line data: <Available at CDS (J/A+A/658/A69): stars.dat sb2.dat sb1.dat pnororb.dat varnop.dat nonvar.dat>

Simbad objects: 124

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Number of rows : 124
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 * kap Cas s*b 00 32 59.9918836206 +62 55 54.413126128 3.50 4.30 4.16 4.02 3.96 BC0.7Ia 474 0
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
3 NGC 330 Cl* 00 56 18.55 -72 27 45.1 9.37 9.76 9.55   8.89 ~ 445 0
4 * ome For * 02 33 50.7014978880 -28 13 56.415570096 4.7 4.90 4.96     B9.5IV 73 0
5 V* CC Cas SB* 03 14 05.3361655368 +59 33 48.485582712 7.07 7.56 7.08     O8.5III(n)((f)) 308 0
6 HD 21071 Pu* 03 25 57.3820460520 +49 07 14.729885580 5.53 6.02 6.09     B7V 180 0
7 HD 21389 sg* 03 29 54.7436040912 +58 52 43.496880384 4.99 5.10 4.54 4.03 3.53 A0Ia 305 0
8 * ksi Per ** 03 58 57.9024302099 +35 47 27.709515737 3.190 4.080 4.060 3.88 3.89 O7.5III(n)((f)) 850 0
9 * eta Aur PM* 05 06 30.8941413263 +41 14 04.112669983 2.33 3.00 3.18 3.23 3.40 B3V 391 0
10 * tau Ori * 05 17 36.3903358088 -06 50 39.866785352 3.01 3.47 3.59     B6III 198 0
11 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
12 HD 36936 * 05 34 59.0052704976 -04 21 15.320553408   7.44 7.55     B5V 70 0
13 RMC 136 Cl* 05 38 42.396 -69 06 03.36   5.81 5.40     ~ 2236 2
14 * nu. Ori SB* 06 07 34.3251233989 +14 46 06.510739548 3.6 4.240 4.397     B3IV 239 0
15 * bet CMa bC* 06 22 41.9853527 -17 57 21.307352 0.77 1.73 1.97 2.11 2.35 B1II-III 748 0
16 * eta CMa s*b 07 24 05.70228 -29 18 11.1798 1.65 2.37 2.45 2.38 2.44 B5Ia 379 0
17 * eta Leo sg* 10 07 19.9523915176 +16 45 45.587968398 3.17 3.39 3.41 3.32 3.35 A0Ib 351 0
18 * alf Dra SB* 14 04 23.3575968507 +64 22 33.130623243 3.520 3.640 3.680     A0III 290 0
19 * ome Sco bC* 16 06 48.4249866846 -20 40 09.079866331 3.10 3.92 3.97 3.91 3.99 B1V 492 0
20 NAME Upper Sco-Cen As* 16 15 -24.2           ~ 1497 1
21 HD 148937 SB* 16 33 52.3869185520 -48 06 40.476418740 6.49 7.12 6.71 7.61   O6f?p 417 1
22 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
23 CD-41 10989 Y*O 16 53 06.0620888688 -41 53 18.640540572 11.12 11.55 11.08     B0:IV/V 15 0
24 HD 152076 Y*O 16 53 07.3002035928 -41 43 45.479256528 7.98 9.10 8.90 9.36   B0III 57 0
25 NGC 6231 723 SB* 16 53 07.3957269240 -41 53 31.238667924 11.643 11.896 11.435   10.736 B3:V 8 0
26 CD-41 10990 Y*? 16 53 08.1765406224 -41 47 12.008007996 10.76 11.19 10.852   10.326 B1V 13 0
27 HD 326343 Y*O 16 53 19.3987800696 -41 54 30.009450816 10.526 10.954 10.579   9.994 B3 25 0
28 HD 326326 Y*? 16 53 20.3374325424 -41 48 26.740392300 10.764 11.211 10.931   10.462 B2 15 0
29 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
30 NGC 6231 30 Y*? 16 53 41.9639057592 -41 48 20.835380016 11.727 11.94 11.625 11.71 11.149 ~ 14 0
31 NGC 6231 41 Y*O 16 53 44.0300553960 -41 50 36.790108080 12.498 12.704 12.423   11.951 ~ 13 0
32 HD 326328 SB* 16 53 45.5874473424 -41 49 09.633232164 9.792 10.382 10.213   9.857 B3 41 0
33 NGC 6231 33 Y*? 16 53 46.9871839944 -41 48 54.948359880 12.400 12.621 12.375 12.60 11.962 B6-8V 12 0
34 NGC 6231 54 Y*O 16 53 47.9802961776 -41 55 04.377359136 12.883 12.991 12.650   12.126 ~ 7 0
35 NGC 6231 14 Y*? 16 53 48.4712973240 -41 45 21.816629028 11.711 12.020 11.751   11.298 ~ 12 0
36 Cl* NGC 6231 MG 166 * 16 53 49.8119301168 -41 50 12.548366304 11.902 12.157 11.952   11.569 ~ 4 0
37 2MASS J16535119-4150538 Y*? 16 53 51.1986460008 -41 50 53.780192484 12.810 12.893 12.616   12.167 ~ 14 0
38 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
39 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
40 HD 152219 SB* 16 53 55.6078109256 -41 52 51.496403268 6.950 7.705 7.569   7.267 O9.5III(n) 114 0
41 NGC 6231 24 Be* 16 53 56.1157621704 -41 46 37.868545596 11.643 11.959 11.718   11.349 B_ 15 0
42 NGC 6231 283 Y*O 16 53 56.1857491848 -41 48 15.778884168 11.847 12.129 11.880   11.523 B3V 14 0
43 V* V1293 Sco SB* 16 53 57.5918059848 -41 38 41.669125044 9.39 10.3 10.2     B1.5:V 26 0
44 NGC 6231 255 SB* 16 53 57.7886640144 -41 52 46.974573336 12.999 13.159 12.842   12.382 ~ 13 0
45 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
46 NGC 6231 284 Y*? 16 53 58.9450563264 -41 47 20.399113140 12.912 12.783 12.338   11.677 B4.5V 11 0
47 NGC 6231 249 Pu* 16 53 59.3149479480 -41 53 04.040266236 11.810 12.132 11.876 12.11 11.504 B4-5V 14 0
48 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
49 CPD-41 7717 SB* 16 54 01.1357227320 -41 38 59.828390700 9.787 10.404 10.2030   9.873 ~ 16 0
50 CD-41 11023 Y*? 16 54 01.5408522648 -41 49 25.180583160 13.083 13.043 12.736 12.949 12.439 ~ 19 0
51 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
52 2MASS J16540315-4151492 Y*? 16 54 03.1543694544 -41 51 49.267424952 10.675 11.144 10.907 11.9 10.528 B2-3V 25 0
53 NGC 6231 1 Y*? 16 54 03.5029815552 -41 42 52.052270868 11.900 12.222 11.950   11.522 ~ 13 0
54 NGC 6231 194 Y*O 16 54 03.8074799328 -41 45 48.399381972 11.365 11.722 11.459   11.055 B3.5V 14 0
55 CD-41 11030 SB* 16 54 05.0795262120 -41 50 06.929151792 8.924 9.575 9.457   9.201 B1V 49 0
56 NGC 6231 274 Y*O 16 54 05.9340520296 -41 49 44.616862200 11.644 11.984 11.769   11.419 B3V 14 0
57 CPD-41 7722 SB* 16 54 06.5922330576 -41 44 26.398570380 9.586 10.178 10.017   9.700 B1V 19 0
58 CD-41 11048 Y*O 16 54 06.7112222064 -41 50 07.105056468 8.903 9.541 9.421   9.161 B1V 40 0
59 CD-41 11027B Y*? 16 54 06.8315169048 -41 51 01.370381580 9.412 10.049 9.898   9.600 B1.5V 12 0
60 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
61 CD-41 11031 Y*? 16 54 07.5342145320 -41 44 40.655325588 9.443 10.051 9.887   9.566 B0V 29 0
62 HD 326340 Y*? 16 54 09.0228207192 -41 58 00.563537352 9.536 10.146 9.930 10.11 9.500 B5 32 0
63 NGC 6231 273 SB* 16 54 09.1491981312 -41 50 12.711714324 12.890 13.070 12.770   12.365 ~ 22 0
64 CPD-41 7727 SB* 16 54 09.2737061088 -41 48 41.072216580 8.964 9.564 9.424   9.134 B1V 40 0
65 NGC 6231 209 Y*? 16 54 10.7255921880 -41 47 47.372416692 10.307 10.795 10.599 10.62 10.265 B2IV-V 31 0
66 NGC 6231 374 Y*? 16 54 10.9603526328 -41 49 39.103879044   10.373 10.157 10.66 9.813 ~ 15 0
67 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
68 2MASS J16541226-4152379 Y*? 16 54 12.2656589688 -41 52 37.834376808 12.742 12.854 12.484   11.914 B8.5V 9 0
69 NGC 6231 75 Y*O 16 54 13.0666322088 -41 56 31.114321152 13.054 13.104 12.757   12.216 B8.5V 8 0
70 CD-41 11037 SB* 16 54 13.2253067352 -41 50 32.518100184 7.21 8.08 7.90     O9IV 78 0
71 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
72 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
73 NGC 6231 OpC 16 54 14.4 -41 48 53           ~ 562 0
74 NGC 6231 236 Y*? 16 54 14.7168894120 -41 51 11.012092416 11.199 11.614 11.385   11.020 B2.5V 18 0
75 NGC 6231 78 SB* 16 54 15.0912272619 -41 55 29.121897977 11.694 11.920 11.585   11.083 B8.5III 10 0
76 NGC 6231 235 Y*? 16 54 15.5478377712 -41 50 54.932715564 13.701 13.655 13.292   12.757 B8.5V 12 0
77 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
78 NGC 6231 361 Y*O 16 54 16.0456147560 -41 50 24.244559952 11.784 12.103 11.841   11.425 ~ 8 0
79 NGC 6231 189 SB* 16 54 16.8013206864 -41 45 08.349698880 11.732 11.847 11.573   11.118 B8-9V 18 0
80 NGC 6231 234 Y*? 16 54 17.4803263056 -41 51 03.545232948 13.152 13.166 12.818   12.309 B8Vn 15 0
81 NGC 6231 213 Y*O 16 54 17.9338413600 -41 48 01.303610616 10.799 11.257 11.059 11.12 10.735 B2IVn 24 0
82 NGC 6231 225 SB* 16 54 18.1360278600 -41 50 16.435116096 13.332 13.392 13.062 13.26 12.553 B9V 13 0
83 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
84 HD 326339 Y*? 16 54 19.3229318352 -41 57 30.961268928 10.136 10.501 10.108   9.505 B3 27 0
85 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
86 NGC 6231 227 Y*O 16 54 20.3720519760 -41 50 49.236526140 12.674 12.820 12.498   12.024 B7Vn 14 0
87 V* V1207 Sco Y*O 16 54 20.6163048120 -41 49 28.631620668 11.062 11.455 11.198 11.23 10.774 B1Vn: 13 0
88 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
89 2MASS J16542132-4155368 SB* 16 54 21.3262677648 -41 55 36.804715680 11.089 11.497 11.178   10.656 ~ 6 0
90 NGC 6231 223 Y*O 16 54 21.6930463104 -41 49 54.394363704 11.825 12.011 11.719 11.81 11.302 B6Vn 14 0
91 NGC 6231 217 Y*? 16 54 21.9945751848 -41 48 47.202861852 12.325 12.547 12.248   11.784 B6Vn 12 0
92 NGC 6231 186 Y*? 16 54 22.8349538304 -41 45 23.377881024 11.409 11.789 11.516   11.074 B2.5V 12 0
93 NGC 6231 108 Y*? 16 54 23.4504384648 -41 52 51.219013980 11.324 11.715 11.435   10.983 B2V 26 0
94 NGC 6231 165 Y*? 16 54 25.9676364672 -41 47 07.020964176 12.624 12.759 12.493   12.066 B7.5V 15 0
95 2MASS J16542604-4145543 Y*? 16 54 26.0457934152 -41 45 54.287973180 12.238 12.319 11.985   11.492 B8.5V 11 0
96 HD 326331B Y*? 16 54 26.4799717176 -41 49 51.328087788 9.618 10.165 9.959   9.570 ~ 8 0
97 NGC 6231 222 Y*? 16 54 27.9736192464 -41 50 13.972594056 11.856 12.119 11.829   11.373 B4Vn 15 0
98 NGC 6231 160 Y*? 16 54 28.9686377592 -41 48 26.136612252 11.857 12.150 11.848   11.369 B3III 11 0
99 CPD-41 7746 Y*O 16 54 29.4909163992 -41 39 14.951295468 8.755 9.406 9.192   8.821 ~ 25 0
100 HD 326319 * 16 54 31.1403111648 -41 38 40.715436876   10.94 10.58     A0 15 0
101 HD 152314 ** 16 54 32.0048577720 -41 48 18.848961036 7.256 7.974 7.749 9.01 7.446 O9IV 113 0
102 NGC 6231 96 Y*? 16 54 32.1272389800 -41 56 53.414142036 10.942 11.386 11.052   10.525 B1.5V 8 0
103 NGC 6231 115 Y*? 16 54 35.2821848544 -41 54 49.759853112 11.408 11.753 11.473   11.033 ~ 7 0
104 NGC 6231 152 Y*? 16 54 35.7137568144 -41 49 42.609738900 12.470 12.676 12.371   11.900 B5V 14 0
105 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
106 V* V947 Sco bC* 16 54 36.0500878224 -41 53 38.119259292 9.45 10.06 9.78 10.06   B1V 53 0
107 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
108 HD 326317 Y*O 16 54 41.2161553920 -41 39 01.815871968 9.72 10.4 10.2     B2 24 0
109 NGC 6231 173 Y*? 16 54 42.3103676808 -41 45 58.233921876 13.265 13.248 12.927   12.430 ~ 10 0
110 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
111 NGC 6231 123 Y*? 16 54 44.1866518992 -41 55 08.608420632 12.348 12.602 12.311   11.861 ~ 11 0
112 NGC 6231 121 Y*? 16 54 44.2080316248 -41 56 27.202831728 11.037 11.50 11.217 11.30 10.801 ~ 14 0
113 NGC 6231 172 * 16 54 44.64 -41 46 44.3 13.216 13.165 12.838   12.324 ~ 7 0
114 NGC 6231 175 Y*? 16 54 44.8910402928 -41 44 59.511407244 13.677 13.608 13.274   12.779 B9V 9 0
115 NGC 6231 127 * 16 54 47.2746239112 -41 52 49.572768180 12.143 12.398 12.033   11.460 B8III-IV 11 0
116 2MASS J16544772-4150477 Y*? 16 54 47.7220274112 -41 50 47.741743068 12.190 12.466 12.155   11.662 ~ 9 0
117 HD 326334 Y*O 16 54 53.4167885112 -41 47 07.508743008 10.450 10.942 10.738 10.85 10.383 B3 20 0
118 2MASS J16545369-4149125 Y*? 16 54 53.6971664328 -41 49 12.537580404 12.810 12.693 12.319   11.775 B9.5V 6 0
119 NGC 6231 146 Y*? 16 54 58.2510917784 -41 49 17.768602704 11.199 11.565 11.290   10.886 ~ 6 0
120 * 67 Oph s*b 18 00 38.7157893000 +02 55 53.633402904 3.34 3.96 3.93 3.84 3.81 B4Ib-II 422 0
121 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
122 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 1023 0
123 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
124 * 10 Lac ** 22 39 15.6786372 +39 03 00.971152 3.650 4.670 4.880 4.98 5.19 O9V 790 0

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