2015MNRAS.449..741W

Query : 2015MNRAS.449..741W

2015MNRAS.449..741W - Mon. Not. R. Astron. Soc., 449, 741-760 (2015/May-1)

The massive star population of Cygnus OB2.

WRIGHT N.J., DREW J.E. and MOHR-SMITH M.

Abstract (from CDS):

We have compiled a significantly updated and comprehensive census of massive stars in the nearby Cygnus OB2 association by gathering and homogenizing data from across the literature. The census contains 169 primary OB stars, including 52 O-type stars and 3 Wolf-Rayet stars. Spectral types and photometry are used to place the stars in a Hertzsprung-Russell diagram, which is compared to both non-rotating and rotating stellar evolution models, from which stellar masses and ages are calculated. The star formation history and mass function of the association are assessed, and both are found to be heavily influenced by the evolution of the most massive stars to their end states. We find that the mass function of the most massive stars is consistent with a `universal' power-law slope of Γ = 1.3. The age distribution inferred from stellar evolutionary models with rotation and the mass function suggest the majority of star formation occurred more or less continuously between 1 and 7 Myr ago, in agreement with studies of low- and intermediate-mass stars in the association. We identify a nearby young pulsar and runaway O-type star that may have originated in Cyg OB2 and suggest that the association has already seen its first supernova. Finally we use the census and mass function to calculate the total mass of the association of 16 500^+3800_-2800M☉, at the low end, but consistent with, previous estimates of the total mass of Cyg OB2. Despite this Cyg OB2 is still one of the most massive groups of young stars known in our Galaxy making it a prime target for studies of star formation on the largest scales.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): Stars: early-type - Stars: massive - open clusters and associations: individual: Cygnus OB2

VizieR on-line data: <Available at CDS (J/MNRAS/449/741): census.dat refs.dat>

CDS comments: MT NNN = [MT91] NNN ; #NN = Schulte NN ; C02 ANN = [CPR2002] ANN in Simbad (except for the ENN sources).

Simbad objects: 174

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Number of rows : 174
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 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2514 0
2 Ass Cyg OB 1 As* 20 17.8 +37 38           ~ 270 1
3 NAME Northern Coalsack DNe 20 21 +37.0           ~ 124 0
4 Ass Cyg OB 9 As* 20 21 +39.9           ~ 136 0
5 NAME Cyg X Cld 20 30 04.7973633 +40 51 36.002197           ~ 962 1
6 V* V1827 Cyg s*b 20 30 27.3018237840 +41 13 25.130220744     13.053     O6Iaf+O9Ia 42 0
7 [CPR2002] A23 s*b 20 30 39.6999117024 +41 08 48.792195024   12.41 11.296     B0.7Ib 19 0
8 GSC 03161-01264 * 20 30 39.8050574280 +41 36 50.632151976 15.11 14.57 12.93     O6.5V 24 0
9 RLP 1520 SB* 20 30 50.7333660192 +41 35 06.639049932 15.23 15.04 13.74     B1.5V+B+? 20 0
10 GSC 03161-01224 * 20 30 51.1144819416 +41 20 21.764885280 17.28 16.66 14.48     B0V 20 0
11 [CPR2002] A26 LP* 20 30 57.7270705416 +41 09 57.526899120           O9V 15 0
12 GSC 03161-00706 * 20 30 59.383 +41 35 59.94   15 13.73     B2V 12 0
13 Schulte 1 SB* 20 31 10.544472 +41 31 53.52024 12.82 12.69 11.09 10.57   O8V+B 70 0
14 RLP 1592 SB* 20 31 18.3295427976 +41 21 21.703264884 15.88 15.09 12.99     O9III+ 32 0
15 Schulte 2 V* 20 31 22.0268518920 +41 31 28.365740076 12.01 11.82 10.64     B1Ib: 68 0
16 [CPR2002] A30 * 20 31 22.1000229360 +41 12 02.886968160   15.23 13.32 12.66   B0.2III 15 0
17 2MASS J20313055+4137159 * 20 31 30.5455693344 +41 37 15.901609728   15.78 14.56     B2V 13 0
18 RLP 582 SB* 20 31 33.3769187472 +41 22 49.014033456 16.52 15.81 13.81     B1V+B2V: 23 0
19 2MASS J20313364+4136046 * 20 31 33.6418510320 +41 36 04.668424776   15.89 14.60     B3V 12 0
20 2MASS J20313415+4131082 * 20 31 34.1481969360 +41 31 08.186201328   16.14 14.88     B3IV 10 0
21 [CPR2002] A15 * 20 31 36.9100232904 +40 59 09.036657888           O7Ib(f) 15 0
22 2MASS J20314163+4128209 * 20 31 41.6293813680 +41 28 20.916711732   15.74 14.40     B3V 12 0
23 TeV J2032+4130 gam 20 31.7 +41 31           ~ 148 0
24 RLP 593 * 20 31 45.3998073432 +41 18 26.728678620 14.91 14.25 12.26     O8V 32 0
25 BD+40 4213 * 20 31 46.0043597736 +41 17 27.073550796   9.523 9.109 9.19   F5V 18 0
26 Schulte 20 SB* 20 31 49.6575031512 +41 28 26.510600388 12.67 12.63 11.52     O9III+B 50 0
27 2MASS J20315540+4135276 * 20 31 55.4022789624 +41 35 27.530995560   16.32 15.07     B3V 8 0
28 [MT91] 170 * 20 31 56.2299160317 +41 35 12.058029704   16.26 15.21     B5:V 7 0
29 GSC 03161-01016 * 20 31 56.3690544360 +41 33 04.995050292 15.38 15.11 13.90     B1.5V 13 0
30 RLP 210 SB* 20 31 56.9461566120 +41 31 47.764616124 13.99 13.76 12.55     B2III+G-B 25 0
31 2MASS J20315961+4114504 * 20 31 59.6101878360 +41 14 50.455810716           O7.5Vz 16 0
32 GSC 03161-00887 * 20 31 59.9614054272 +41 37 14.085624216   15.46 14.00     B3V 10 0
33 MR 110 WR* 20 32 03.0201049320 +41 15 20.499732216   15.99 13.97     WC5 85 0
34 2MASS J20320311+4132302 * 20 32 03.1061515488 +41 32 30.239553552   15.34 14.14     B2Ve 10 0
35 RLP 545 LP* 20 32 03.7666533504 +41 25 10.443609084 15.15 14.76 13.24     B0.5V 25 0
36 GSC 03161-00885 * 20 32 04.8045585936 +41 28 44.084705556   14.85 13.81     B3IV 12 0
37 EM* AS 422 WR* 20 32 06.2786571432 +40 48 29.527101576   13.46 11.83     WN7o/CE+O7V(f) 107 0
38 2MASS J20320689+4117570 * 20 32 06.8731854672 +41 17 56.967519984   15.92 13.94     B0:II 13 0
39 RLP 615 SB* 20 32 07.9695369168 +41 21 59.849287740   15.81 14.46     B2V+A-B 14 0
40 [MT91] 213 Psr 20 32 13.1247390384 +41 27 24.346666440 13.12 13.08 11.266     B0Vp 334 0
41 [MT91] 215 * 20 32 13.5181557696 +41 27 29.986649172   13.93 12.97     B1V 11 0
42 RLP 527 * 20 32 13.8078585168 +41 27 41.414129244   14.2 13.02     B1.5V 13 0
43 BD+40 4219 * 20 32 13.8219154968 +41 27 12.006516060 11.50 11.40 10.22     O7III((f)) 115 0
44 2MASS J20321460+4122330 * 20 32 14.5997206848 +41 22 33.096770112 16.36 15.86 14.34     B1V 17 0
45 [MT91] 221 * 20 32 14.6955487680 +41 27 39.686180652   14.92 13.62     B2V 14 0
46 2MASS J20321504+4119303 * 20 32 15.0387020568 +41 19 30.424269828   16.29 14.9     B3V 13 0
47 Schulte 14 Em* 20 32 16.5622071096 +41 25 35.670679176 12.84 12.27 11.47     O9V 53 0
48 RLP 619 SB* 20 32 19.6472111832 +41 20 38.899179780 14.79 14.53 13.25     B1.5V+B 18 0
49 2MASS J20322135+4118354 * 20 32 21.3466446144 +41 18 35.477965044 17.31 16.71 14.91     B1V 16 0
50 GSC 03161-01342 * 20 32 21.7501948560 +41 34 25.027112892   15.47 14.33     B4V 12 0
51 RLP 530 SB* 20 32 22.1197789656 +41 27 42.085617228   14.58 13.88     B1.5V+B 14 0
52 BD+40 4220 s*b 20 32 22.4238071594 +41 18 18.942475904 11.32 10.61 9.185     O7Iafep 414 0
53 GSC 03161-01109 * 20 32 25.4843793648 +41 24 52.124339520 14.99 14.67 13.36     B2V 18 0
54 GSC 03161-01003 * 20 32 26.0775184320 +41 29 39.333966612 14.1 13.94 12.88     B1V 19 0
55 RLP 631 SB* 20 32 26.5055734776 +41 19 13.836357012 16.11 15.7 14.15     B2III+B1V 23 0
56 GSC 03161-01143 * 20 32 27.2345395008 +41 21 56.631173220   16.2 14.82     B2III 14 0
57 [CPR2002] A39 * 20 32 27.3402185280 +40 55 18.247769256           B2V 19 0
58 Schulte 15 SB* 20 32 27.6544131144 +41 26 22.073616744 12.39 12.30 11.10     O8V+B 55 0
59 Schulte 21 * 20 32 27.7375852104 +41 28 52.248099612 12.39 12.01 11.30 11.05   B0Ib 50 0
60 GSC 03157-01112 * 20 32 30.8858373048 +41 07 03.622397484   13.80 12.66 12.33   B2III 11 0
61 RLP 497 SB* 20 32 31.4083592352 +41 30 51.602419368   15.81 14.38     B2.5V 13 0
62 RLP 887 SB* 20 32 31.5336715464 +41 14 08.190216276   15.44 13.00 12.15   O7Ib(f) 43 0
63 2MASS J20323233+4122578 * 20 32 32.3197776144 +41 22 57.794705436   16.17 14.68     B4V 12 0
64 ALS 15186 * 20 32 32.5377656160 +41 26 46.815246960 16.82 16.48 14.91     B5:V 10 0
65 ALS 15143 * 20 32 32.6575447728 +41 27 04.595697396 14.71 14.57 13.47     B2V 15 0
66 [CPR2002] A38 * 20 32 34.8659821944 +40 56 17.342185776       12.65   O8V 18 0
67 [CPR2002] A33 * 20 32 34.9789086552 +40 52 38.950175100           B0.2IV 9 0
68 RLP 492 SB* 20 32 37.0177286328 +41 23 05.186805072 15.01 14.59 13.08     B2V+B-F 25 0
69 RLP 494 SB* 20 32 37.7595818832 +41 26 15.394216992 15.18 14.92 13.71     B1.5V+G-B 21 0
70 2MASS J20323835+4128567 * 20 32 38.3435626200 +41 28 56.719109964   15.68 14.43     B3V 16 0
71 Schulte 16 * 20 32 38.5694704320 +41 25 13.776724056 12.05 11.88 11.12     O7.5IV(n) 55 0
72 2MASS J20323886+4125208 * 20 32 38.8624280376 +41 25 20.817913620 14.29 14.26 13.05     B1V 18 0
73 BD+40 4223 * 20 32 39.0564906216 +41 00 07.769840832 13.02 12.0 10.5     B0Ia 22 0
74 KMJ 1718 * 20 32 39.5067307512 +40 52 47.457723828   15.2   13.1   B0.2IV 14 0
75 Schulte 12 s*b 20 32 40.9572199728 +41 14 29.279036940 16.1 14.45 11.702     B3-4Ia+ 453 0
76 RLP 644 SB* 20 32 42.8884391784 +41 20 16.477275012   15.26 13.87     B2V+B3V 21 0
77 BD+40 4221 * 20 32 45.4494231552 +41 25 37.543209348 12.06 11.93 10.68     O8.5V(n) 64 0
78 2MASS J20324645+4124223 * 20 32 46.4541809184 +41 24 22.390164468   16.24 14.91     B2.5V 13 0
79 2MASS J20324675+4126160 * 20 32 46.7554583832 +41 26 16.005248736   15.67 14.30     B1.5III 13 0
80 [MT91] 336 SB* 20 32 49.6802921976 +41 25 36.457180680   15.3 14.13     B2V+B-M 15 0
81 Schulte 17 SB* 20 32 50.0160775512 +41 23 44.684507976 13.15 12.43 11.33     O8V+O-G 49 0
82 2MASS J20325075+4115022 * 20 32 50.7471146328 +41 15 02.183388768 17.2 16.42 14.44     B1V 19 0
83 Schulte 37 * 20 32 54.4064649768 +41 15 21.849647796 17.76 16.97 14.81     B3V 18 0
84 2MASS J20325667+4123408 * 20 32 56.6636273064 +41 23 40.890896304 15.41 15.09 13.81     B1V 19 0
85 RLP 994 SB* 20 32 58.9203050976 +41 04 30.012303288 18.01 17.14 14.958   12.580 B0V+B2:V 30 0
86 GSC 03161-01218 * 20 32 59.1773346576 +41 24 25.491471588 13.47 13.26 11.91     O8V 36 0
87 Schulte 41 SB* 20 32 59.6317342392 +41 15 14.679727632 16.54 15.59 13.49     O9.7III(n) 37 0
88 RLP 666 SB* 20 33 02.9131259304 +41 17 43.161301572 15.67 15.06 12.94 12.18   O8V+G-O 40 0
89 [CPR2002] A20 * 20 33 02.9279638392 +40 47 25.319304852           O8II((f)) 21 0
90 Schulte 54 * 20 33 04.4144078688 +41 17 08.958424344 16.58 15.89 14.14     B1V 21 0
91 GSC 03161-01357 * 20 33 05.1877575840 +41 17 51.239205816 16.28 15.77 14.15     B1V 21 0
92 RLP 107 SB* 20 33 05.2620969456 +41 43 36.748888104 14.9 14.43 12.94     B1V+B 28 0
93 2MASS J20330661+4121131 * 20 33 06.6113074032 +41 21 13.128687648 16.58 15.97 14.21     B0.5V 20 0
94 Schulte 22 SB* 20 33 08.799 +41 13 18.21 14.33 13.59 11.55     O3If*+O6V((f)) 76 0
95 Schulte 50 SB* 20 33 09.60288 +41 13 00.5520 15.52 14.82 12.86 12.32   O9V+B9V-A0V 38 1
96 Schulte 51 * 20 33 10.1211775920 +41 13 10.168704480 16.29 15.56 13.62     O9.5Vn 27 1
97 2MASS J20331029+4123446 * 20 33 10.2850243200 +41 23 44.600309880 16.67 16.36 14.97     B4II-III 16 0
98 ALS 15161 * 20 33 10.34 +41 13 06.4 16.63 16 14.05     BOV 17 0
99 2MASS J20331046+4120574 * 20 33 10.4640116712 +41 20 57.371779536   15.83 14.06     B1V 21 0
100 RLP 678 EB* 20 33 10.5041613984 +41 22 22.405661292 14.97 14.54 12.958     B0V+(B3V+B6V) 44 0
101 Schulte 9 s*b 20 33 10.7362926720 +41 15 08.222370372 13.38 12.77 10.96     O5I+O4III 243 0
102 2MASS J20331106+4110321 * 20 33 11.0607015672 +41 10 32.027017008 17.82 16.97 14.78     B0.7:V: 22 0
103 2MASS J20331137+4117585 * 20 33 11.3739563424 +41 17 58.553509524 16.36 15.9 14.38     B2III: 20 0
104 2MASS J20331182+4124054 * 20 33 11.8143520176 +41 24 05.411799324   15.6 14.12     B5V 11 0
105 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 1023 0
106 RLP 853 SB* 20 33 13.2612575376 +41 13 28.656230412 16.63 15.76 13.61     O6.5V((f)) 39 0
107 2MASS J20331336+4126397 * 20 33 13.3579462512 +41 26 39.674315220   15.59 14.45     B5:V 16 0
108 GSC 03157-00872 * 20 33 13.6906302984 +41 13 05.770090668 15.27 14.73 12.92     O8V 36 0
109 Schulte 7 * 20 33 14.1095938872 +41 20 21.904113804 12.24 12.00 10.55     O3If* 153 0
110 ALS 15175 * 20 33 14.3372675616 +41 19 33.126329208 17.15 16.46 14.67     B5: 13 0
111 BD+40 4227B * 20 33 14.7561575856 +41 18 41.750437968 11.99 11.64 10.70     O6II(f) 83 0
112 Cl Bica 2 OpC 20 33 15 +41 18.7           ~ 22 0
113 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) 253 0
114 GSC 03161-01087 * 20 33 15.3141210600 +41 29 56.765628888 15.49 15.02 13.43     B1V 20 0
115 2MASS J20331548+4127331 * 20 33 15.4898271312 +41 27 33.088374504 15.4 15.06 13.65     B1III 16 0
116 Schulte 23 * 20 33 15.7083033168 +41 20 17.174193540 14.21 14.07 12.61     O9V 41 0
117 Schulte 8D SB* 20 33 16.3364502072 +41 19 01.883101584 13.66 13.47 12.02     O8.5V+O9V+A2V-O 45 0
118 2MASS J20331740+4112387 * 20 33 17.4051695952 +41 12 38.725251624 17.11 16.34 14.43     B0.5V(n) 23 0
119 Schulte 24 * 20 33 17.4825784080 +41 17 09.350977524 13.85 13.47 11.88     O8V(n) 51 0
120 Schulte 8C * 20 33 17.9820761856 +41 18 31.194812988 12.2 11.43 10.19     O4.5III(fc) 89 0
121 RLP 680 SB* 20 33 18.0338622552 +41 21 36.661612428 13.9 12.72 11.82     O8V+B-O 39 0
122 Schulte 64 Be* 20 33 18.5309527200 +41 15 35.149489128 18.17 17.24 14.88     B1Ve-B3Ve 30 0
123 2MASS J20331859+4124493 * 20 33 18.5863677984 +41 24 49.347699948 16.75 16.29 14.76     B0.2V 17 0
124 [CPR2002] B15 LP* 20 33 18.6998367888 +40 59 37.862830464   15.69 13.54     B0.5IIIe 14 0
125 ALS 15184 * 20 33 19.1423803776 +41 17 44.986739532 17.04 16.53 14.85     B1V 16 0
126 2MASS J20331927+4124448 * 20 33 19.2666413880 +41 24 44.823537180 17.05 16.6 14.99     B5IV 15 0
127 ALS 15177 * 20 33 20.9918123376 +41 35 51.817116372 17.08 16.51 14.72     B0V 15 0
128 GSC 03161-01385 * 20 33 21.0165110136 +41 17 40.120725840 14.57 14.24 12.70     O9V 33 0
129 2MASS J20332245+4122169 * 20 33 22.4490987024 +41 22 16.932211788 16.1 15.68 14.26     B2V 21 0
130 Schulte 66 * 20 33 23.2325429760 +41 13 42.026795400 17.68 16.69 14.66     B1V 17 0
131 2MASS J20332334+4120171 * 20 33 23.3393716008 +41 20 17.192174676 15.67 15.24 13.74     B1V 22 0
132 RLP 841 ** 20 33 23.472072 +41 09 12.90312 14.97 14.23 11.83 10.98   O6IV((f)) 43 0
133 V* V2190 Cyg Em* 20 33 24.7399778520 +41 22 04.473811524     14.06     B2Ve: 20 0
134 Schulte 25 * 20 33 25.564 +41 33 27.00 13.52 13.15 11.58     O8Vz 34 0
135 GSC 03157-00327 * 20 33 26.7558420864 +41 10 59.437772256 15.48 14.87 13.00     O8Vz 38 0
136 Schulte 74 SB* 20 33 30.3173970432 +41 35 57.893152056 15.04 14.41 12.51     O8V+B2-O 32 0
137 Schulte 18 * 20 33 30.7901427336 +41 15 22.693080852 13.38 12.54 10.860     B1I 51 0
138 RLP 724 SB* 20 33 31.6396483032 +41 21 45.972551592 15.34 15.03 13.73     B2V+B-O 22 0
139 2MASS J20333334+4108364 * 20 33 33.3500051064 +41 08 36.400701228 17.78 16.92 14.76     B3V 14 0
140 GSC 03161-01254 * 20 33 33.939 +41 19 38.25 15.95 15.49 13.87     B3I 22 0
141 EM* AS 427 Em* 20 33 34.3352362680 +41 18 11.427242760 15.61 15.18 13.41     B2Ve 31 0
142 Schulte 70 SB* 20 33 36.9940107864 +41 16 11.325832716 14.46 14.06 12.40     O9.5IV(n) 39 0
143 2MASS J20333821+4053411 * 20 33 38.2173755304 +40 53 41.187436440           B0Ib 8 0
144 Schulte 19 s*b 20 33 39.1040288712 +41 19 25.992295824 12.91 12.77 10.944 10.38   B0Iab+B-O 73 0
145 EM* AS 428 SB* 20 33 39.7935831360 +41 22 52.188298860 13.17 12.21 11.38     B1V+B1: 38 0
146 GSC 03161-01086 * 20 33 40.8633896328 +41 30 18.953823168 14.61 14.32 12.77     O7V 28 0
147 GSC 03157-01100 * 20 33 42.3404625144 +41 11 45.547805292 16.22 15.71 13.89     O9.7:V: 23 0
148 2MASS J20334254+4114566 * 20 33 42.5364294456 +41 14 56.650040124 17.41 16.84 14.93     B1V: 19 0
149 BD+41 3804 s*b 20 33 46.1145474912 +41 33 00.991426968 11.82 11.41 9.88     O9.7Iab 104 0
150 2MASS J20334680+4108019 * 20 33 46.8086403840 +41 08 01.822162056 16.06 15.53 13.81     B1III 20 0
151 GSC 03161-01190 * 20 33 47.5736777208 +41 29 58.104710124   15.78 14.27     B5V: 8 0
152 2MASS J20334758+4109064 * 20 33 47.5864735272 +41 09 06.418488996   16.14 14.21     B2V 16 0
153 Schulte 26 * 20 33 47.8316875224 +41 20 41.377739100 13.77 13.33 11.78     B1III 34 0
154 2MASS J20334835+4113138 * 20 33 48.3548742888 +41 13 13.759164012 17.09 16.52 14.65     B2III 17 0
155 2MASS J20334879+4137400 * 20 33 48.7935041088 +41 37 40.082862576 16.7 16.47 14.94     B2Ve: 17 0
156 Schulte 71 SB* 20 33 48.8417931672 +41 19 40.566513900 15.12 14.73 13.34     B1V+B1.5V 23 0
157 GSC 03157-00193 * 20 33 59.2509364128 +41 05 38.094030708 15.76 15.3 13.61     B0V 24 0
158 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) 58 0
159 GSC 03157-01008 * 20 34 04.3480515480 +41 08 07.924191792 16.06 15.46 13.66     B1III 20 0
160 GSC 03157-00727 * 20 34 04.8605977224 +41 05 12.915621852 15.88 15.34 13.50     O8.5V 21 0
161 RLP 814 SB* 20 34 06.0155486352 +41 08 09.132034596 16.37 15.64 13.415     B0-B1+B1-B2 35 0
162 BD+41 3807 SB* 20 34 08.5147948176 +41 36 59.408503092 11.74 11.52 10.03     O5.5Ifc 137 0
163 Schulte 75 * 20 34 09.5115755136 +41 34 13.732080096 14.51 14.25 12.79     O9.5IV 29 0
164 Schulte 29 SB* 20 34 13.5108732672 +41 35 02.859602280 13.59 13.41 11.91     O7V+B-O 47 0
165 [CPR2002] A28 * 20 34 16.0461896016 +41 02 19.568894712   16.05 13.89 13.10   O9.5V 15 0
166 Schulte 73 SB* 20 34 21.9323730840 +41 17 01.655524788   14.13 12.40     O8Vz+O8Vz 34 0
167 2MASS J20342462+4126250 * 20 34 24.6201342744 +41 26 25.138048272 16.74 16.32 14.65     B1V 19 0
168 RLP 335 SB* 20 34 29.5987121592 +41 31 45.516383076 14.72 13.30 11.64     O7V+O9V 47 0
169 Schulte 30 Em* 20 34 43.5995109360 +41 29 04.799547924 14.13 13.83 12.240     B1.5III 36 0
170 [CPR2002] A24 * 20 34 44.1106226280 +40 51 58.699418040           O6.5III(f) 14 0
171 [CPR2002] A27 * 20 34 44.7167065392 +40 51 46.731492072   13.61 11.08     B0Ia 17 0
172 V* V2550 Cyg SB* 20 34 58.7802708120 +41 36 17.359091316   13.591 11.470 10.671   B0Ib+B0III 31 0
173 MR 112 WR* 20 35 47.0859278605 +41 22 44.703520146     12.64 12.16   WC6+O8I-IIf 162 1
174 [CPR2002] A37 * 20 36 04.4996355240 +40 56 13.040299752           O5V((f)) 28 0

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