2019A&A...623A..83C


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.02CET14:50:43

2019A&A...623A..83C - Astronomy and Astrophysics, volume 623A, 83-83 (2019/3-1)

A VLT/FLAMES survey for massive binaries in Westerlund 1. V. The X-ray selected blue stragglers Wd1-27 and -30a.

CLARK J.S., NAJARRO F., NEGUERUELA I., RITCHIE B.W., GONZALEZ-FERNANDEZ C. and LOHR M.E.

Abstract (from CDS):


Context. Recent observational studies indicate that a large number of OB stars are found within binary systems which may be expected to interact during their lifetimes. Significant mass transfer or indeed merger of both components is expected to modify evolutionary pathways, facilitating the production of exceptionally massive stars which will present as blue stragglers. Identification and characterisation of such objects is crucial if the efficiency of mass transfer is to be established; a critical parameter in determining the outcomes of binary evolutionary channels.
Aims. The young and coeval massive cluster Westerlund 1 hosts a rich population of X-ray bright OB and Wolf-Rayet stars where the emission is attributed to shocks in the wind collision zones of massive binaries. Motivated by this, we instigated a study of the extremely X-ray luminous O supergiants Wd1-27 and -30a.
Methods. We subjected a multi-wavelength and -epoch photometric and spectroscopic dataset to quantitative non-LTE model atmosphere and time-series analysis in order to determine fundamental stellar parameters and search for evidence of binarity. A detailed examination of the second Gaia data release was undertaken to establish cluster membership.
Results. Both stars were found to be early/mid-O hypergiants with luminosities, temperatures and masses significantly in excess of other early stars within Wd1, hence qualifying as massive blue stragglers. The binary nature of Wd1-27 remains uncertain but the detection of radial velocity changes and the X-ray properties of Wd1-30a suggest that it is a binary with an orbital period ≤10 days. Analysis of Gaia proper motion and parallactic data indicates that both stars are cluster members; we also provide a membership list for Wd1 based on this analysis.
Conclusions. The presence of hypergiants of spectral types O to M within Wd1 cannot be understood solely via single-star evolution. We suppose that the early-B and mid-O hypergiants formed via binary-induced mass-stripping of the primary and mass-transfer to the secondary, respectively. This implies that for a subset of objects massive star-formation may be regarded as a two-stage process, with binary-driven mass-transfer or merger yielding stars with masses significantly in excess of their initial "birth" mass.

Abstract Copyright: © ESO 2019

Journal keyword(s): blue stragglers - binaries: general - stars: early-type - stars: evolution - stars: individual: Wd1-27 - stars: individual: Wd1-30a

CDS comments: Table A.1 Cl* Westerlund 1 W 58 not in SIMBAD.

Simbad objects: 128

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Number of rows : 128

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 346 Cl* 00 59 05.090 -72 10 33.24           ~ 451 0
2 Cl* NGC 346 MPG 782 EB* 00 59 30.37 -72 09 09.7 13.06 14.19 14.35   14.82 B1: 10 0
3 HD 13854 s*b 02 16 51.7161542593 +57 03 18.880915822 6.10 6.76 6.48 6.14 5.95 B1Iab 205 0
4 HD 14434 Em* 02 21 52.4122106464 +56 54 18.032877629 7.87 8.65 8.49 8.29 8.20 O5.5Vnn((f))p 170 0
5 HD 14947 s*b 02 26 46.9895793276 +58 52 33.116841083 7.83 8.44 7.98     O4.5If 238 0
6 HD 15570 Em* 02 32 49.4205362766 +61 22 42.089023028 8.40 8.80 8.11 7.41 6.86 O4If 284 0
7 * alf Cam s*b 04 54 03.0103983 +66 20 33.636467 3.47 4.34 4.29 4.18 4.18 O9Ia 639 1
8 * eps Ori s*b 05 36 12.81335 -01 12 06.9089 0.48 1.51 1.69 1.76 1.93 B0Ia 860 0
9 RMC 136 Cl* 05 38 42.396 -69 06 03.36           ~ 1761 1
10 HD 115842 Em* 13 20 48.3389216362 -55 48 02.482627552 5.70 6.39 6.09 5.77 5.52 B0.5Ia/ab 143 0
11 HD 134959 Pu* 15 15 24.08285 -59 04 29.2972 9.05 9.14 8.10 8.64   B2Ia 73 0
12 Cl* Westerlund 1 W 56a * 16 46.9 -45 51           ~ 4 0
13 Cl* Westerlund 1 W 3002 * 16 46 54.2 -45 51 54   23.6 18.93 16.08 13.26 B0Iab 5 0
14 HD 151018 * 16 46 56.1174839681 -45 53 14.316404052 8.9 9.93 9.37 9.35   O9Ib 60 0
15 Cl* Westerlund 1 W 86 * 16 46 57.1592223945 -45 50 09.942344569   22.9 18.76 16.43 14.00 O9.5Ib 6 0
16 [B2007] J164657.71-455320.0 V* 16 46 57.7256759569 -45 53 20.034351977       14.741 12.318 B0Iab 7 0
17 Cl* Westerlund 1 W 228b * 16 46 58.0542750049 -45 53 00.930705088           O9Ib 6 0
18 Cl* Westerlund 1 W 55 * 16 46 58.4202565824 -45 51 31.291602492   21.6 18.030 15.283 12.758 O9.5B0.5Ia 12 0
19 Cl* Westerlund 1 W 56b * 16 46 58.8 -45 51 45   22.8 18.88 16.36 13.76 O9.5Ib 7 0
20 Cl* Westerlund 1 W 84 * 16 46 59.03 -45 50 28.2   21.3 17.82 15.60 13.63 O9.5Ib 7 0
21 Cl* Westerlund 1 W 1 * 16 46 59.4000616512 -45 50 46.717334625   21.9 18.37 16.09 13.65 ~ 5 0
22 Cl* Westerlund 1 W 2 * 16 46 59.72 -45 50 51.3   20.4 16.978 14.287 11.771 O9.5B0.5Ia 13 0
23 WR 77b WR* 16 46 59.90 -45 55 25.6       16.9 13.0 WC9d 9 0
24 Cl* Westerlund 1 W 53 * 16 47 00.3870705334 -45 51 31.855415177   22.9 18.51 15.80 13.13 ~ 6 0
25 WR 77c WR* 16 47 00.8819171237 -45 51 20.512015820     19 17.336 14.340 WN8o 11 0
26 Cl* Westerlund 1 W 21 V* 16 47 01.13 -45 51 13.4   22.5 18.41 15.619 12.861 B0.5Ia 8 0
27 Cl* Westerlund 1 W 50b * 16 47 01.1720907616 -45 50 26.809089235   22.8 19.66 17.21 14.69 O9III 5 0
28 Cl* Westerlund 1 W 57a * 16 47 01.3597701479 -45 51 45.799486574   20.7 16.877 13.83 11.13 B4Ia 11 0
29 Cl* Westerlund 1 W 59 * 16 47 01.4 -45 51 50   23.1 18.97 16.33 13.64 ~ 2 0
30 Cl* Westerlund 1 BKS H * 16 47 01.4273629136 -45 50 37.260634424   18.781 14.47     F3Ia+ 24 0
31 WR 77d WR* 16 47 01.5 -45 51 45           WN 8 0
32 Cl* Westerlund 1 W 78 V* 16 47 01.5495728784 -45 49 57.921299756     17.413 14.621 12.04 B1Ia 8 0
33 WR 77e WR* 16 47 01.668 -45 51 20.40     19     WN 10 0
34 [B2007] J164701.69-455257.8 V* 16 47 01.6818173410 -45 52 58.068922232       15.393 12.966 O9.5Ib 6 0
35 Cl* Westerlund 1 W 52 * 16 47 01.8447542252 -45 51 29.440031536   21.8 17.876 14.745 12.065 B1.5Ia 8 0
36 Cl* Westerlund 1 W 49 * 16 47 01.9032261354 -45 50 31.657908629   22.6 18.76 16.392 13.638 B0Iab 9 0
37 Cl* Westerlund 1 W 24 * 16 47 02.1549780316 -45 51 12.574291870   23.0 18.71 15.96 13.24 O9.2Ia 14 0
38 Cl* Westerlund 1 W 12 * 16 47 02.23 -45 50 59.1   22.0 17.575 13.611   F1Ia+ 21 0
39 Cl* Westerlund 1 W 11 * 16 47 02.2393028215 -45 50 47.194497409   21.2 17.508 14.599 11.898 O9.5B0.5Ia 13 0
40 Cl* Westerlund 1 W 61a * 16 47 02.2999490685 -45 51 41.769006403   21.2 17.506 14.633 12.01 O9.5B0.5Ia 12 0
41 Cl* Westerlund 1 W 48 V* 16 47 02.4594130530 -45 51 24.951891528       16.818 13.966 ~ 3 0
42 Cl* Westerlund 1 W 62a * 16 47 02.5 -45 51 37           O9.2Iab 7 0
43 Cl* Westerlund 1 W 23 * 16 47 02.56 -45 51 08.8   22.1 18.316 14.986 12.081 O9.5B0.5Ia 13 0
44 Cl* Westerlund 1 W 61b * 16 47 02.5661124892 -45 51 41.865044969   22.7 18.59 16.00 13.31 O9.5Iab 13 0
45 Cl* Westerlund 1 W 41 * 16 47 02.70 -45 50 56.9   21.3 17.87 15.39 12.78 O9.2Ia 12 0
46 Cl* Westerlund 1 W 38 * 16 47 02.8 -45 50 46   23.2 19.10 16.47 13.81 O9Iab 7 0
47 Cl* Westerlund 1 W 6b * 16 47 02.93 -45 50 22.3   23.6 20.20 17.91 15.25 O9.5III 5 0
48 WR 77f WR* 16 47 02.96 -45 50 19.7   21.552 17.792 15.035 12.508 WN10-11h 25 0
49 Cl* Westerlund 1 W 54 * 16 47 03.06 -45 51 30.5           B0.5Iab 5 0
50 Cl* Westerlund 1 BKS B * 16 47 03.1074828977 -45 52 18.957165027   22.8 19.008 13.634   M3Ia 21 0
51 WR 77g WR* 16 47 03.15 -45 50 43.8     19     WN 11 0
52 Cl* Westerlund 1 W 42 * 16 47 03.25 -45 50 52.2         10.764 B9Ia+ 16 0
53 Cl* Westerlund 1 W 10 s*b 16 47 03.3403089792 -45 50 34.601286210   22.720 18.516 15.257   O9.5/B0.5Iae 14 0
54 Cl* Westerlund 1 W 63a * 16 47 03.39 -45 51 57.7   22.6 18.56 16.20 13.68 B0Iab 5 0
55 Cl* Westerlund 1 W 43b * 16 47 03.52 -45 50 56.5           B1Ia 5 0
56 Cl* Westerlund 1 W 43 * 16 47 03.56 -45 50 57.6   22.8 18.05 15.378 12.647 O9.5B0.5Ia 14 0
57 Cl* Westerlund 1 W 46b * 16 47 03.61 -45 51 20.0           O9.5Ib 5 0
58 Hen 3-1250 Em* 16 47 03.6265799796 -45 50 14.357624931   20.0 15.972     B5Ia+ 23 0
59 Cl* Westerlund 1 BKS F s*y 16 47 03.6836562279 -45 50 43.530430986     15.05     F5Ia+ 19 0
60 Cl* Westerlund 1 W 43c * 16 47 03.76 -45 50 58.3   20.4 18.35 16.18 13.66 O9Ib 6 0
61 Cl* Westerlund 1 W 31 s*b 16 47 03.7850215117 -45 50 40.370909455           B0I+OB 7 0
62 Cl* Westerlund 1 W 65 * 16 47 03.8 -45 51 46   22.9 18.73 16.27 13.68 O9Ib 7 0
63 Cl* Westerlund 1 W 46a s*b 16 47 03.93 -45 51 19.6   23.0 18.55 15.537 12.499 B1Ia 12 0
64 WR 77i WR* 16 47 03.9633607588 -45 51 37.683424360     19.79 16.906 13.949 WC9d 9 0
65 Cl Westerlund 1 OpC 16 47 04.00 -45 51 04.9           ~ 482 0
66 Cl* Westerlund 1 W 6a * 16 47 04.00 -45 50 21.0   22.2 18.41 15.80 13.16 B0.5Iab 7 0
67 Cl* Westerlund 1 CN G WR* 16 47 04.03 -45 51 25.1   22.7 20.87 17.75 14.68 WN7o 15 0
68 Cl* Westerlund 1 W 30 ** 16 47 04.11 -45 50 39.0   22.4 18.45 15.80 13.20 O+O 17 0
69 Cl* Westerlund 1 W 33 * 16 47 04.1266525740 -45 50 48.475675980   20.090 15.61 12.803   B5Ia+ 20 0
70 Cl* Westerlund 1 W 60 * 16 47 04.1334135473 -45 51 52.256261673   22.8 18.50 16.041 13.384 O9.5B0.5Ia 14 0
71 Cl* Westerlund 1 W 9 WR* 16 47 04.1422943113 -45 50 31.307461802   21.8 17.47 14.47 11.74 Be 46 0
72 Cl* Westerlund 1 W 35 * 16 47 04.2013795259 -45 50 53.715343785   22.7 18.59 16.00 13.31 O9.5B0.5Ia 10 0
73 WR 77k WR* 16 47 04.2024907825 -45 51 07.245158203   22.6 18.86 15.61 12.52 WN7 22 0
74 Cl* Westerlund 1 CN H WR* 16 47 04.22 -45 51 20.2           WC9d 10 0
75 Cl* Westerlund 1 W 34 * 16 47 04.39 -45 50 47.2   22.1 18.15 15.40 12.69 ~ 6 0
76 Cl* Westerlund 1 CN C WR* 16 47 04.40 -45 51 03.8     19     WC9d 8 0
77 Cl* Westerlund 1 W 29 s*b 16 47 04.41 -45 50 39.8   22.6 18.66 16.02 13.38 O9.5/B0.5Ia 10 0
78 Cl* Westerlund 1 W 238 * 16 47 04.4262088378 -45 52 27.766019210   21.4 17.820 14.98 12.45 O9.5B0.5Ia 13 0
79 Cl* Westerlund 1 W 28 s*b 16 47 04.63 -45 50 38.4   20.9 17.146 14.303   B2Ia 12 0
80 Cl* Westerlund 1 W 20 s*r 16 47 04.6954939457 -45 51 23.957603850       15.660   M6I 18 0
81 Cl* Westerlund 1 W 8 * 16 47 04.81 -45 50 25.2   19.9 15.913     F8Ia+ 15 0
82 Cl* Westerlund 1 W 19 * 16 47 04.8656136905 -45 50 59.294757475   22.6 18.784 15.366 12.452 O9.5B0.5Ia 13 0
83 Cl* Westerlund 1 W 8b * 16 47 04.95 -45 50 26.7           B1.5Ia 7 0
84 Cl* Westerlund 1 W 36 * 16 47 05.0818815492 -45 50 55.159484121   22.8 18.89 16.09 13.38 ~ 8 0
85 Cl* Westerlund 1 W 27 * 16 47 05.1556032855 -45 50 41.414756475   21.5 17.94 15.35 12.80 O9I+OI 7 0
86 WR 77n WR* 16 47 05.2111619515 -45 52 24.987049941   21.7 17.86 15.39 12.90 WC9d 24 0
87 WR 77o WR* 16 47 05.37 -45 51 04.7     20.99 17.50 14.37 WN7o 21 0
88 Cl* Westerlund 1 BKS AS * 16 47 05.4063692757 -45 50 36.608299661   22.1 16.79     M5-6Ia 29 0
89 2MASS J16470570-4550506 V* 16 47 05.71 -45 50 50.7   21.2 17.610 14.898 12.228 B0.5Ia 7 0
90 Cl* Westerlund 1 W 14 * 16 47 05.94 -45 50 23.3           ~ 6 0
91 Cl* Westerlund 1 W 39a * 16 47.1 -45 51           ~ 3 0
92 Cl* Westerlund 1 W 37 * 16 47 06.01 -45 50 47.4   22.8 19.11 16.40 13.65 O9Ib 5 0
93 WR 77p WR* 16 47 06.0558179916 -45 52 08.310667517     18.379 15.675 12.940 WC9 18 0
94 Cl* Westerlund 1 W 17 * 16 47 06.2491553642 -45 50 49.290357352   22.7 18.87 16.19 13.56 O9Iab 13 0
95 Cl* Westerlund 1 W 265 * 16 47 06.2786920752 -45 49 23.781230202   22.0 17.739   10.54 F1-5Ia+ 20 0
96 WR 77r WR* 16 47 06.28 -45 51 26.4     19 18.935 15.600 WN7o 15 0
97 Cl* Westerlund 1 W 13 EB* 16 47 06.4536718776 -45 50 26.067083031   21.1 17.19 14.63 12.06 BIa+ 28 0
98 Cl* Westerlund 1 W 16 * 16 47 06.6152064188 -45 50 42.171179650   20.5 16.248     A5Ia+ 23 0
99 Cl* Westerlund 1 W 15 * 16 47 06.6298019596 -45 50 29.720379477   22.8 18.96 16.38 13.75 O9.2Ia 21 0
100 Cl* Westerlund 1 W 74 * 16 47 07.0789459358 -45 50 13.090797987       15.835 13.312 O9.2Ia 10 0
101 Cl* Westerlund 1 W 243 s*b 16 47 07.5028508821 -45 52 29.152464693   19.873 15.730     LBV 53 0
102 WR 77sb WR* 16 47 07.6628412189 -45 52 35.973599868       16.886 14.047 WN6o 11 0
103 WR 77s WR* 16 47 08.3531944202 -45 50 45.405753222     19.69 16.59 13.68 WN7b 23 0
104 Cl* Westerlund 1 W 71 * 16 47 08.4569033058 -45 50 49.327340354   21.5 17.531 14.158 11.16 B2.5Ia 17 0
105 Cl* Westerlund 1 BKS E * 16 47 08.9189383747 -45 49 58.452680562     16.70     M4Ia 18 0
106 Cl* Westerlund 1 W 70 * 16 47 09.3840936441 -45 50 49.680751506   21.2 16.88   11.352 B3Ia 13 0
107 PSR J1647-4552 Psr 16 47 10.18 -45 52 16.7           ~ 178 1
108 Cl* Westerlund 1 W 3003 V* 16 47 11.6071818028 -45 49 22.481518691       16.211 13.314 B0Ib 5 0
109 [B2007] J164713.39-454910.5 V* 16 47 13.3836504044 -45 49 10.640529609       15.960 12.990 B0Iab 5 0
110 NAME Sco OB 1 As* 16 53.5 -41 57           ~ 195 0
111 HD 152233 SB* 16 54 03.5915443398 -41 47 29.834880322 5.93 6.72 6.59     O6II(f) 180 0
112 NGC 6231 OpC 16 54 08.51 -41 49 36.0   2.83 2.6     ~ 488 0
113 HD 152248 bL* 16 54 10.0614779606 -41 49 30.143138696 5.56 6.15 6.088     O7Iabf+O7Ib(f) 232 0
114 HD 153919 HXB 17 03 56.7728262865 -37 50 38.912077679 6.06 6.78 6.51 6.08 5.90 O6Iafcp 762 1
115 HD 154368 s*b 17 06 28.3687923960 -35 27 03.759955171 6.10 6.63 6.13 7.12   O9.5Iab 267 0
116 GCIRS 7 * 17 45 39.987 -29 00 22.24           M2 348 0
117 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11840 0
118 GCIRS 8 * 17 45 40.14 -28 59 58.7           O 71 0
119 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 642 0
120 NAME Quintuplet Cluster OpC 17 46 13.9 -28 49 48           ~ 455 0
121 WR 102j WR* 17 46 17.53 -28 49 29.0           WN9 11 0
122 V* RY Sct Be* 18 25 31.4772031860 -12 41 24.196044092 10.25 10.38 9.12 9.46   O9.7Ibep 286 1
123 HD 190918 WR* 20 05 57.3242972785 +35 47 18.153743699 6.11 6.88 6.75     WN5+O9I 345 0
124 NGC 6871 OpC 20 05 59 +35 46.6   5.43 5.2     ~ 198 0
125 Ass Cyg OB 3 As* 20 07 +35.9           ~ 169 0
126 HD 192639 s*b 20 14 30.4275040181 +37 21 13.815126140 6.83 7.46 7.11     O7.5Iabf 270 0
127 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 810 0
128 NGC 7789 OpC 23 57 24 +56 42.5   7.68 6.7     ~ 459 0

    Equat.    Gal    SGal    Ecl

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2020.12.02-14:50:43

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