2020AJ....160..115C

Query : 2020AJ....160..115C

2020AJ....160..115C - Astron. J., 160, 115-115 (2020/September-0)

A high angular resolution survey of massive stars in Cygnus OB2 JHK adaptive optics results from the Gemini Near-Infrared Imager.

CABALLERO-NIEVES S.M., GIES D.R., BAINES E.K., BOUCHEZ A.H., DEKANY R.G., GOODWIN S.P., RICKMAN E.L., ROBERTS L.C., TAGGART K., TEN BRUMMELAAR T.A. and TURNER N.H.

Abstract (from CDS):

We present results of a high angular resolution survey of massive OB stars in the Cygnus OB2 association that we conducted with the Near-Infrared Imager camera and ALTAIR adaptive optics system of the Gemini North telescope. We observed 74 O- and early-B-type stars in Cyg OB2 in the JHK infrared bands in order to detect binary and multiple companions. The observations are sensitive to equal-brightness pairs at separations as small as 0′′ / . 08, and progressively fainter companions are detectable out to Δ K=9 mag at a separation of 2''. This faint contrast limit due to read noise continues out to 10'' near the edge of the detector. We assigned a simple probability of chance alignment to each companion based upon its separation and magnitude difference from the central target star and upon areal star counts for the general star field of Cyg OB2. Companion stars with a field membership probability of less than 1% are assumed to be physical companions. This assessment indicates that 47% of the targets have at least one resolved companion that is probably gravitationally bound. Including known spectroscopic binaries, our sample includes 27 binary, 12 triple, and 9 systems with 4 or more components. These results confirm studies of high-mass stars in other environments that find that massive stars are born with a high-multiplicity fraction. The results are important for the placement of the stars in the Hertzsprung-Russell diagram, the interpretation of their spectroscopic analyses, and for future mass determinations through measurement of orbital motion.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Massive stars - Early-type stars - Wide binary stars - OB associations - OB stars

VizieR on-line data: <Available at CDS (J/AJ/160/115): table1.dat table3.dat table4.dat table5.dat>

Simbad objects: 89

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Number of rows : 89
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17435 0
2 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2331 0
3 NAME Ori Trapezium OpC 05 35 16.5 -05 23 14           ~ 1619 1
4 NAME Ori I As* 05 38 -02.8           ~ 615 0
5 NAME 30 Dor Nebula SFR 05 38 36.0 -69 05 11           ~ 1190 2
6 NAME Upper Sco Association As* 16 12 -23.4           ~ 1369 1
7 NAME Upper Sco-Cen As* 16 15 -24.2           ~ 1330 1
8 M 16 OpC 18 18 45.1 -13 47 31           ~ 1029 1
9 [CPR2002] A18 * 20 30 07.8777080832 +41 23 50.423946144           O8V 9 0
10 V* V1827 Cyg s*b 20 30 27.3018237840 +41 13 25.130220744     13.053     O6Iaf+O9Ia 36 0
11 [CPR2002] A23 s*b 20 30 39.6999117024 +41 08 48.792195024   12.41 11.296     B0.7Ib 17 0
12 GSC 03161-01264 * 20 30 39.8050574280 +41 36 50.632151976 15.11 14.57 12.93     O6.5V 23 0
13 [CPR2002] A26 LP* 20 30 57.7270705416 +41 09 57.526899120           O9V 13 0
14 TYC 3157-776-1 * 20 31 00.2042940672 +40 49 49.692155556   12.10 11.22     O7V((f)) 16 0
15 TYC 3161-732-1 * 20 31 08.3769788976 +42 02 42.212727960   13.12 12.29     O9.7II 14 0
16 Schulte 1 SB* 20 31 10.544472 +41 31 53.52024 12.82 12.69 11.09 10.57   O8V+B 65 0
17 RLP 1592 SB* 20 31 18.3295427976 +41 21 21.703264884 15.88 15.09 12.99     O9III+ 27 0
18 Schulte 2 V* 20 31 22.0268518920 +41 31 28.365740076 12.01 11.82 10.64     B1Ib: 65 0
19 [CPR2002] A15 * 20 31 36.9100232904 +40 59 09.036657888           O7Ib(f) 15 0
20 BD+40 4212 SB* 20 31 37.5053189952 +41 13 21.001757520 12.46 11.5 10.214     O6IV:+O9III 79 1
21 RLP 593 * 20 31 45.3998073432 +41 18 26.728678620 14.91 14.25 12.26     O8V 31 0
22 BD+40 4213 * 20 31 46.0043597736 +41 17 27.073550796   9.523 9.109 9.19   F5V 18 0
23 Schulte 20 SB* 20 31 49.6575031512 +41 28 26.510600388 12.67 12.63 11.52     O9III+B 46 0
24 MR 110 WR* 20 32 03.0201049320 +41 15 20.499732216   15.99 13.97     WC5 82 0
25 EM* AS 422 WR* 20 32 06.2786571432 +40 48 29.527101576   13.46 11.83     WN7o/CE+O7V(f) 101 0
26 [MT91] 213 Psr 20 32 13.1247390384 +41 27 24.346666440 13.12 13.08 11.266     B0Vp 290 0
27 BD+40 4219 * 20 32 13.8219154968 +41 27 12.006516060 11.50 11.40 10.22     O7III((f)) 113 0
28 Schulte 14 Em* 20 32 16.5622071096 +41 25 35.670679176 12.84 12.27 11.47     O9V 48 0
29 BD+40 4220 s*b 20 32 22.4238071594 +41 18 18.942475904 11.32 10.61 9.185     O7Iafep 399 0
30 GSC 03161-01003 * 20 32 26.0775184320 +41 29 39.333966612 14.1 13.94 12.88     B1V 17 0
31 Schulte 15 SB* 20 32 27.6544131144 +41 26 22.073616744 12.39 12.30 11.10     O8V+B 52 0
32 Schulte 21 * 20 32 27.7375852104 +41 28 52.248099612 12.39 12.01 11.30 11.05   B0Ib 45 0
33 [CPR2002] A32 SB* 20 32 30.3115469568 +40 34 33.237363720           O9.5IV 14 0
34 RLP 887 SB* 20 32 31.5335925286 +41 14 08.189588225   15.44 13.00 12.15   O7.5III-I+O/B 20 0
35 [CPR2002] A11 SB* 20 32 31.5336715464 +41 14 08.190216276           O7Ib(f) 27 0
36 [CPR2002] A38 * 20 32 34.8659821944 +40 56 17.342185776       12.65   O8V 15 0
37 [CPR2002] A25 * 20 32 38.4437517288 +40 40 44.481528480           O8III 12 0
38 Schulte 16 * 20 32 38.5694704320 +41 25 13.776724056 12.05 11.88 11.12     O7.5IV(n) 51 0
39 Schulte 12 s*b 20 32 40.9572199728 +41 14 29.279036940 16.1 14.45 11.702     B3-4Ia+ 424 0
40 BD+40 4221 * 20 32 45.4494231552 +41 25 37.543209348 12.06 11.93 10.68     O8.5V(n) 61 0
41 Schulte 17 SB* 20 32 50.0160775512 +41 23 44.684507976 13.15 12.43 11.33     O8V+O-G 44 0
42 GSC 03161-01218 * 20 32 59.1773346576 +41 24 25.491471588 13.47 13.26 11.91     O8V 33 0
43 RLP 666 SB* 20 33 02.9131259304 +41 17 43.161301572 15.67 15.06 12.94 12.18   O8V+G-O 35 0
44 [CPR2002] A20 * 20 33 02.9279638392 +40 47 25.319304852           O8II((f)) 20 0
45 RLP 107 SB* 20 33 05.2620969456 +41 43 36.748888104 14.9 14.43 12.94     B1V+B 24 0
46 Schulte 22 SB* 20 33 08.799 +41 13 18.21 14.33 13.59 11.55     O3If*+O6V((f)) 72 0
47 Schulte 50 SB* 20 33 09.60288 +41 13 00.5520 15.52 14.82 12.86 12.32   O9V+B9V-A0V 34 1
48 RLP 678 EB* 20 33 10.5041613984 +41 22 22.405661292 14.97 14.54 12.958     B0V+(B3V+B6V) 40 0
49 Schulte 9 s*b 20 33 10.7362926720 +41 15 08.222370372 13.38 12.77 10.96     O5I+O4III 232 0
50 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 943 0
51 RLP 853 SB* 20 33 13.2612575376 +41 13 28.656230412 16.63 15.76 13.61     O6.5V((f)) 36 0
52 GSC 03157-00872 * 20 33 13.6906302984 +41 13 05.770090668 15.27 14.73 12.92     O8V 33 0
53 Schulte 7 * 20 33 14.1095938872 +41 20 21.904113804 12.24 12.00 10.55     O3If* 145 0
54 BD+40 4227B * 20 33 14.7561575856 +41 18 41.750437968 11.99 11.64 10.70     O6II(f) 80 0
55 BD+40 4227A SB* 20 33 15.0781182864 +41 18 50.479292556 10.42 10.27 8.98 8.03 6.83 O6Ib(fc)+O4.5:III:(fc) 246 0
56 Schulte 23 * 20 33 15.7083033168 +41 20 17.174193540 14.21 14.07 12.61     O9V 38 0
57 Schulte 8D SB* 20 33 16.3364502072 +41 19 01.883101584 13.66 13.47 12.02     O8.5V+O9V+A2V-O 44 0
58 Schulte 24 * 20 33 17.4825784080 +41 17 09.350977524 13.85 13.47 11.88     O8V(n) 47 0
59 Schulte 8C * 20 33 17.9820761856 +41 18 31.194812988 12.2 11.43 10.19     O4.5III(fc) 83 0
60 RLP 680 SB* 20 33 18.0338622552 +41 21 36.661612428 13.9 12.72 11.82     O8V+B-O 38 0
61 GSC 03161-01385 * 20 33 21.0165110136 +41 17 40.120725840 14.57 14.24 12.70     O9V 32 0
62 RLP 841 ** 20 33 23.472072 +41 09 12.90312 14.97 14.23 11.83 10.98   O6IV((f)) 41 0
63 Schulte 25 * 20 33 25.564 +41 33 27.00 13.52 13.15 11.58     O8Vz 30 0
64 GSC 03157-00327 * 20 33 26.7558420864 +41 10 59.437772256 15.48 14.87 13.00     O8Vz 34 0
65 Schulte 74 SB* 20 33 30.3173970432 +41 35 57.893152056 15.04 14.41 12.51     O8V+B2-O 29 0
66 Schulte 18 * 20 33 30.7901427336 +41 15 22.693080852 13.38 12.54 10.860     B1I 49 0
67 Schulte 70 SB* 20 33 36.9940107864 +41 16 11.325832716 14.46 14.06 12.40     O9.5IV(n) 36 0
68 [CPR2002] A12 * 20 33 38.2141818168 +40 41 06.375488928           B1Ib 8 0
69 Schulte 19 s*b 20 33 39.1040288712 +41 19 25.992295824 12.91 12.77 10.944 10.38   B0Iab+B-O 70 0
70 EM* AS 428 SB* 20 33 39.7935831360 +41 22 52.188298860 13.17 12.21 11.38     B1V+B1: 35 0
71 GSC 03161-01086 * 20 33 40.8633896328 +41 30 18.953823168 14.61 14.32 12.77     O7V 27 0
72 BD+41 3804 s*b 20 33 46.1145474912 +41 33 00.991426968 11.82 11.41 9.88     O9.7Iab 103 0
73 Schulte 26 * 20 33 47.8316875224 +41 20 41.377739100 13.77 13.33 11.78     B1III 31 0
74 GSC 03157-00193 * 20 33 59.2509364128 +41 05 38.094030708 15.76 15.3 13.61     B0V 22 0
75 Schulte 27 SB* 20 33 59.5281120792 +41 17 35.477936340 14.44 13.97 12.203   10.250 O9.7V(n)+O9.7V(n) 50 0
76 GSC 03157-00727 * 20 34 04.8605977224 +41 05 12.915621852 15.88 15.34 13.50     O8.5V 20 0
77 BD+41 3807 SB* 20 34 08.5147948176 +41 36 59.408503092 11.74 11.52 10.03     O5.5Ifc 128 0
78 Schulte 75 * 20 34 09.5115755136 +41 34 13.732080096 14.51 14.25 12.79     O9.5IV 27 0
79 Schulte 29 SB* 20 34 13.5108732672 +41 35 02.859602280 13.59 13.41 11.91     O7V+B-O 42 0
80 Schulte 73 SB* 20 34 21.9323730840 +41 17 01.655524788   14.13 12.40     O8Vz+O8Vz 31 0
81 RLP 335 SB* 20 34 29.5987121592 +41 31 45.516383076 14.72 13.30 11.64     O7V+O9V 45 0
82 Schulte 30 Em* 20 34 43.5995109360 +41 29 04.799547924 14.13 13.83 12.240     B1.5III 35 0
83 [CPR2002] A24 * 20 34 44.1106226280 +40 51 58.699418040           O6.5III(f) 14 0
84 [CPR2002] A27 * 20 34 44.7167065392 +40 51 46.731492072   13.61 11.08     B0Ia 16 0
85 [CPR2002] A29 s*b 20 34 56.0574880584 +40 38 17.940894612           O9.7Iab 13 0
86 MR 112 WR* 20 35 47.0859278605 +41 22 44.703520146     12.64 12.16   WC6+O8I-IIf 155 1
87 [CPR2002] A37 * 20 36 04.4996355240 +40 56 13.040299752           O5V((f)) 25 0
88 Ass Cep OB 2 As* 21 51 +60.0           ~ 294 0
89 NAME III CEP ASSOC As* 23 04.2 +63 24           ~ 322 0

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