2015ApJS..221....1R

Query : 2015ApJS..221....1R

2015ApJS..221....1R - Astrophys. J., Suppl. Ser., 221, 1 (2015/November-0)

X-ray emission from massive stars in Cyg OB2.

RAUW G., NAZE Y., WRIGHT N.J., DRAKE J.J., GUARCELLO M.G., PRINJA R.K., PECK L.W., ALBACETE COLOMBO J.F., HERRERO A., KOBULNICKY H.A., SCIORTINO S. and VINK J.S.

Abstract (from CDS):

We report on the analysis of the Chandra-ACIS data of O, B, and WR stars in the young association Cyg OB2. X-ray spectra of 49 O-stars, 54 B-stars, and 3 WR-stars are analyzed and for the brighter sources, the epoch dependence of the X-ray fluxes is investigated. The O-stars in Cyg OB2 follow a well-defined scaling relation between their X-ray and bolometric luminosities: log(Lx/Lbol) = -7.2 ± 0.2. This relation is in excellent agreement with the one previously derived for the Carina OB1 association. Except for the brightest O-star binaries, there is no general X-ray overluminosity due to colliding winds in O-star binaries. Roughly half of the known B-stars in the surveyed field are detected, but they fail to display a clear relationship between LX and Lbol. Out of the three WR stars in Cyg OB2, probably only WR 144 is itself responsible for the observed level of X-ray emission, at a very low log(Lx/Lbol) = -8.8 ± 2. The X-ray emission of the other two WR-stars (WR 145 and 146) is most probably due to their O-type companion along with a moderate contribution from a wind-wind interaction zone.

Abstract Copyright: ∼

Journal keyword(s): open clusters and associations: individual: Cyg OB2 - stars: early-type - stars: Wolf-Rayet - X-rays: stars

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 116

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Number of rows : 116
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 Ass Car OB 1 As* 10 38 -59.0           ~ 172 0
2 IC 2944 OpC 11 38 20.00 -63 22 22.0           ~ 191 0
3 IC 2948 OpC 11 39 29.6 -63 26 59           ~ 39 0
4 NGC 6231 OpC 16 54 14.4 -41 48 53           ~ 562 0
5 Cl HM 1 OpC 17 19 00 -38 49.0           ~ 52 0
6 HD 169010 WR* 18 23 16.3427231112 -13 43 26.102574732 13.53 12.99 12.02 11.95   WC 82 0
7 GSC 03161-01264 * 20 30 39.8050574280 +41 36 50.632151976 15.11 14.57 12.93     O6.5V 24 0
8 GSC 03161-01224 * 20 30 51.1144819416 +41 20 21.764885280 17.28 16.66 14.48     B0V 20 0
9 [CPR2002] A26 LP* 20 30 57.7270705416 +41 09 57.526899120           O9V 15 0
10 GSC 03161-00706 * 20 30 59.383 +41 35 59.94   15 13.73     B2V 12 0
11 Schulte 1 SB* 20 31 10.544472 +41 31 53.52024 12.82 12.69 11.09 10.57   O8V+B 70 0
12 RLP 1592 SB* 20 31 18.3295427976 +41 21 21.703264884 15.88 15.09 12.99     O9III+ 32 0
13 [CPR2002] A30 * 20 31 22.1000229360 +41 12 02.886968160   15.23 13.32 12.66   B0.2III 15 0
14 RLP 582 SB* 20 31 33.3769187472 +41 22 49.014033456 16.52 15.81 13.81     B1V+B2V: 23 0
15 [CPR2002] A15 * 20 31 36.9100232904 +40 59 09.036657888           O7Ib(f) 15 0
16 BD+40 4212 SB* 20 31 37.5053189952 +41 13 21.001757520 12.46 11.5 10.214     O6IV:+O9III 83 1
17 2MASS J20314163+4128209 * 20 31 41.6293813680 +41 28 20.916711732   15.74 14.40     B3V 12 0
18 RLP 593 * 20 31 45.3998073432 +41 18 26.728678620 14.91 14.25 12.26     O8V 32 0
19 BD+40 4213 * 20 31 46.0043597736 +41 17 27.073550796   9.523 9.109 9.19   F5V 18 0
20 Schulte 20 SB* 20 31 49.6575031512 +41 28 26.510600388 12.67 12.63 11.52     O9III+B 50 0
21 RLP 210 SB* 20 31 56.9461566120 +41 31 47.764616124 13.99 13.76 12.55     B2III+G-B 25 0
22 2MASS J20315961+4114504 * 20 31 59.6101878360 +41 14 50.455810716           O7.5Vz 16 0
23 GSC 03161-00887 * 20 31 59.9614054272 +41 37 14.085624216   15.46 14.00     B3V 10 0
24 MR 110 WR* 20 32 03.0201049320 +41 15 20.499732216   15.99 13.97     WC5 85 0
25 EM* AS 422 WR* 20 32 06.2786571432 +40 48 29.527101576   13.46 11.83     WN7o/CE+O7V(f) 107 0
26 [MT91] 213 Psr 20 32 13.1247390384 +41 27 24.346666440 13.12 13.08 11.266     B0Vp 334 0
27 RLP 527 * 20 32 13.8078585168 +41 27 41.414129244   14.2 13.02     B1.5V 13 0
28 BD+40 4219 * 20 32 13.8219154968 +41 27 12.006516060 11.50 11.40 10.22     O7III((f)) 115 0
29 2MASS J20321460+4122330 * 20 32 14.5997206848 +41 22 33.096770112 16.36 15.86 14.34     B1V 17 0
30 [MT91] 221 * 20 32 14.6955487680 +41 27 39.686180652   14.92 13.62     B2V 14 0
31 Schulte 14 Em* 20 32 16.5622071096 +41 25 35.670679176 12.84 12.27 11.47     O9V 53 0
32 GSC 03161-01342 * 20 32 21.7501948560 +41 34 25.027112892   15.47 14.33     B4V 12 0
33 BD+40 4220 s*b 20 32 22.4238071594 +41 18 18.942475904 11.32 10.61 9.185     O7Iafep 414 0
34 GSC 03161-01003 * 20 32 26.0775184320 +41 29 39.333966612 14.1 13.94 12.88     B1V 19 0
35 RLP 631 SB* 20 32 26.5055734776 +41 19 13.836357012 16.11 15.7 14.15     B2III+B1V 23 0
36 GSC 03161-01143 * 20 32 27.2345395008 +41 21 56.631173220   16.2 14.82     B2III 14 0
37 Schulte 15 SB* 20 32 27.6544131144 +41 26 22.073616744 12.39 12.30 11.10     O8V+B 55 0
38 Schulte 21 * 20 32 27.7375852104 +41 28 52.248099612 12.39 12.01 11.30 11.05   B0Ib 50 0
39 RLP 887 SB* 20 32 31.5336715464 +41 14 08.190216276   15.44 13.00 12.15   O7Ib(f) 43 0
40 2MASS J20323233+4122578 * 20 32 32.3197776144 +41 22 57.794705436   16.17 14.68     B4V 12 0
41 [CPR2002] A38 * 20 32 34.8659821944 +40 56 17.342185776       12.65   O8V 18 0
42 RLP 494 SB* 20 32 37.7595818832 +41 26 15.394216992 15.18 14.92 13.71     B1.5V+G-B 21 0
43 2MASS J20323835+4128567 * 20 32 38.3435626200 +41 28 56.719109964   15.68 14.43     B3V 16 0
44 Schulte 16 * 20 32 38.5694704320 +41 25 13.776724056 12.05 11.88 11.12     O7.5IV(n) 55 0
45 2MASS J20323886+4125208 * 20 32 38.8624280376 +41 25 20.817913620 14.29 14.26 13.05     B1V 18 0
46 KMJ 1718 * 20 32 39.5067307512 +40 52 47.457723828   15.2   13.1   B0.2IV 14 0
47 Schulte 12 s*b 20 32 40.9572199728 +41 14 29.279036940 16.1 14.45 11.702     B3-4Ia+ 453 0
48 RLP 644 SB* 20 32 42.8884391784 +41 20 16.477275012   15.26 13.87     B2V+B3V 21 0
49 BD+40 4221 * 20 32 45.4494231552 +41 25 37.543209348 12.06 11.93 10.68     O8.5V(n) 64 0
50 2MASS J20324645+4124223 * 20 32 46.4541809184 +41 24 22.390164468   16.24 14.91     B2.5V 13 0
51 [MT91] 336 SB* 20 32 49.6802921976 +41 25 36.457180680   15.3 14.13     B2V+B-M 15 0
52 Schulte 17 SB* 20 32 50.0160775512 +41 23 44.684507976 13.15 12.43 11.33     O8V+O-G 49 0
53 Schulte 37 * 20 32 54.4064649768 +41 15 21.849647796 17.76 16.97 14.81     B3V 18 0
54 RLP 994 SB* 20 32 58.9203050976 +41 04 30.012303288 18.01 17.14 14.958   12.580 B0V+B2:V 30 0
55 GSC 03161-01218 * 20 32 59.1773346576 +41 24 25.491471588 13.47 13.26 11.91     O8V 36 0
56 Schulte 41 SB* 20 32 59.6317342392 +41 15 14.679727632 16.54 15.59 13.49     O9.7III(n) 37 0
57 RLP 666 SB* 20 33 02.9131259304 +41 17 43.161301572 15.67 15.06 12.94 12.18   O8V+G-O 40 0
58 [CPR2002] A20 * 20 33 02.9279638392 +40 47 25.319304852           O8II((f)) 21 0
59 GSC 03161-01357 * 20 33 05.1877575840 +41 17 51.239205816 16.28 15.77 14.15     B1V 21 0
60 Schulte 22A * 20 33 08.7655811880 +41 13 18.702872112           O3If* 22 0
61 Schulte 22 SB* 20 33 08.799 +41 13 18.21 14.33 13.59 11.55     O3If*+O6V((f)) 76 0
62 Schulte 22B SB* 20 33 08.8427353416 +41 13 17.413536036           O6V+A-O 19 0
63 Schulte 50 SB* 20 33 09.60288 +41 13 00.5520 15.52 14.82 12.86 12.32   O9V+B9V-A0V 38 1
64 Schulte 51 * 20 33 10.1211775920 +41 13 10.168704480 16.29 15.56 13.62     O9.5Vn 27 1
65 2MASS J20331046+4120574 * 20 33 10.4640116712 +41 20 57.371779536   15.83 14.06     B1V 21 0
66 RLP 678 EB* 20 33 10.5041613984 +41 22 22.405661292 14.97 14.54 12.958     B0V+(B3V+B6V) 44 0
67 Schulte 9 s*b 20 33 10.7362926720 +41 15 08.222370372 13.38 12.77 10.96     O5I+O4III 243 0
68 2MASS J20331106+4110321 * 20 33 11.0607015672 +41 10 32.027017008 17.82 16.97 14.78     B0.7:V: 22 0
69 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 1023 0
70 RLP 853 SB* 20 33 13.2612575376 +41 13 28.656230412 16.63 15.76 13.61     O6.5V((f)) 39 0
71 2MASS J20331336+4126397 * 20 33 13.3579462512 +41 26 39.674315220   15.59 14.45     B5:V 16 0
72 GSC 03157-00872 * 20 33 13.6906302984 +41 13 05.770090668 15.27 14.73 12.92     O8V 36 0
73 Schulte 7 * 20 33 14.1095938872 +41 20 21.904113804 12.24 12.00 10.55     O3If* 153 0
74 ALS 15175 * 20 33 14.3372675616 +41 19 33.126329208 17.15 16.46 14.67     B5: 13 0
75 BD+40 4227B * 20 33 14.7561575856 +41 18 41.750437968 11.99 11.64 10.70     O6II(f) 83 0
76 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
77 GSC 03161-01087 * 20 33 15.3141210600 +41 29 56.765628888 15.49 15.02 13.43     B1V 20 0
78 Schulte 23 * 20 33 15.7083033168 +41 20 17.174193540 14.21 14.07 12.61     O9V 41 0
79 Schulte 8D SB* 20 33 16.3364502072 +41 19 01.883101584 13.66 13.47 12.02     O8.5V+O9V+A2V-O 45 0
80 2MASS J20331740+4112387 * 20 33 17.4051695952 +41 12 38.725251624 17.11 16.34 14.43     B0.5V(n) 23 0
81 Schulte 24 * 20 33 17.4825784080 +41 17 09.350977524 13.85 13.47 11.88     O8V(n) 51 0
82 Schulte 8C * 20 33 17.9820761856 +41 18 31.194812988 12.2 11.43 10.19     O4.5III(fc) 89 0
83 RLP 680 SB* 20 33 18.0338622552 +41 21 36.661612428 13.9 12.72 11.82     O8V+B-O 39 0
84 ALS 15177 * 20 33 20.9918123376 +41 35 51.817116372 17.08 16.51 14.72     B0V 15 0
85 GSC 03161-01385 * 20 33 21.0165110136 +41 17 40.120725840 14.57 14.24 12.70     O9V 33 0
86 RLP 841 ** 20 33 23.472072 +41 09 12.90312 14.97 14.23 11.83 10.98   O6IV((f)) 43 0
87 Schulte 25 * 20 33 25.564 +41 33 27.00 13.52 13.15 11.58     O8Vz 34 0
88 GSC 03157-00327 * 20 33 26.7558420864 +41 10 59.437772256 15.48 14.87 13.00     O8Vz 38 0
89 Schulte 74 SB* 20 33 30.3173970432 +41 35 57.893152056 15.04 14.41 12.51     O8V+B2-O 32 0
90 Schulte 18 * 20 33 30.7901427336 +41 15 22.693080852 13.38 12.54 10.860     B1I 51 0
91 RLP 724 SB* 20 33 31.6396483032 +41 21 45.972551592 15.34 15.03 13.73     B2V+B-O 22 0
92 GSC 03161-01254 * 20 33 33.939 +41 19 38.25 15.95 15.49 13.87     B3I 22 0
93 Schulte 70 SB* 20 33 36.9940107864 +41 16 11.325832716 14.46 14.06 12.40     O9.5IV(n) 39 0
94 2MASS J20333821+4053411 * 20 33 38.2173755304 +40 53 41.187436440           B0Ib 8 0
95 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
96 GSC 03161-01086 * 20 33 40.8633896328 +41 30 18.953823168 14.61 14.32 12.77     O7V 28 0
97 GSC 03157-01100 * 20 33 42.3404625144 +41 11 45.547805292 16.22 15.71 13.89     O9.7:V: 23 0
98 2MASS J20334254+4114566 * 20 33 42.5364294456 +41 14 56.650040124 17.41 16.84 14.93     B1V: 19 0
99 BD+41 3804 s*b 20 33 46.1145474912 +41 33 00.991426968 11.82 11.41 9.88     O9.7Iab 104 0
100 2MASS J20334680+4108019 * 20 33 46.8086403840 +41 08 01.822162056 16.06 15.53 13.81     B1III 20 0
101 2MASS J20334758+4109064 * 20 33 47.5864735272 +41 09 06.418488996   16.14 14.21     B2V 16 0
102 Schulte 26 * 20 33 47.8316875224 +41 20 41.377739100 13.77 13.33 11.78     B1III 34 0
103 Schulte 71 SB* 20 33 48.8417931672 +41 19 40.566513900 15.12 14.73 13.34     B1V+B1.5V 23 0
104 GSC 03157-00193 * 20 33 59.2509364128 +41 05 38.094030708 15.76 15.3 13.61     B0V 24 0
105 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
106 RLP 814 SB* 20 34 06.0155486352 +41 08 09.132034596 16.37 15.64 13.415     B0-B1+B1-B2 35 0
107 BD+41 3807 SB* 20 34 08.5147948176 +41 36 59.408503092 11.74 11.52 10.03     O5.5Ifc 137 0
108 Schulte 75 * 20 34 09.5115755136 +41 34 13.732080096 14.51 14.25 12.79     O9.5IV 29 0
109 Schulte 29 SB* 20 34 13.5108732672 +41 35 02.859602280 13.59 13.41 11.91     O7V+B-O 47 0
110 [CPR2002] A28 * 20 34 16.0461896016 +41 02 19.568894712   16.05 13.89 13.10   O9.5V 15 0
111 Schulte 73 SB* 20 34 21.9323730840 +41 17 01.655524788   14.13 12.40     O8Vz+O8Vz 34 0
112 2MASS J20342462+4126250 * 20 34 24.6201342744 +41 26 25.138048272 16.74 16.32 14.65     B1V 19 0
113 RLP 335 SB* 20 34 29.5987121592 +41 31 45.516383076 14.72 13.30 11.64     O7V+O9V 47 0
114 V* V2550 Cyg SB* 20 34 58.7802708120 +41 36 17.359091316   13.591 11.470 10.671   B0Ib+B0III 31 0
115 MR 112 WR* 20 35 47.0859278605 +41 22 44.703520146     12.64 12.16   WC6+O8I-IIf 162 1
116 NAME Carina Region reg ~ ~           ~ 192 0

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