2009A&A...507.1567C


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.17CET10:24:18

2009A&A...507.1567C - Astronomy and Astrophysics, volume 507, 1567-1574 (2009/12-1)

The binary nature of the galactic centre X-ray source CXOGC J174536.1-285638.

CLARK J.S., CROWTHER P.A. and MIKLES V.J.

Abstract (from CDS):

The combination of X-ray and near-IR surveys of the central 2°x0.8° of the Galactic centre have revealed a population of X-ray bright massive stars. However, the nature of the X-ray emission, originating in wind collision zones or via accretion onto compact objects, is uncertain. In order to address this we investigated the nature of one of the most luminous X-ray sources - CXOGC J174536.1-285638.This was accomplished by an analysis of the near-IR spectrum with a non-LTE model atmosphere code to determine the physical parameters of the primary. This was found to be an highly luminous WN9h star, which is remarkably similar to the most massive stars found in the Arches cluster, for which comparison to evolutionary tracks suggest an age of 2-2.5Myr and an initial mass of ∼110 M. The X-ray properties of CXOGC J174536.1-285638 also resemble those of 3 of the 4 X-ray detected WN9h stars within the Arches and in turn other very massive WNLh colliding wind binaries, of which WR25 forms an almost identical ``twin''. Simple analytical arguments demonstrate consistency between the X-ray emission and a putative WN9h+mid O V-III binary, causing us to favour such a scenario over an accreting binary. However, we may not exclude a high mass X-ray binary interpretation, which, if correct, would provide a unique insight into the (post-SN) evolution of extremely massive stars. Irrespective of the nature of the secondary, CXOGC J174536.1-285638 adds to the growing list of known and candidate WNLh binaries. Of the subset of WNLh stars subject to a radial velocity survey, we find a lower limit to the binary fraction of ∼45%; of interest for studies of massive stellar formation, given that they currently possess the highest dynamically determined masses of any type of star.

Abstract Copyright:

Journal keyword(s): stars: early type - stars: binaries: general - Galaxy: center

Simbad objects: 57

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Number of rows : 57

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 108 SB* 00 06 03.3885906204 +63 40 46.771682957 6.79 7.58 7.40     O4-8f?p 298 0
2 Brey 10a WR* 04 57 27.4549113851 -67 39 02.868479987 12.213 13.314 13.496   13.564 O2If*/WN5 51 1
3 HD 36063 WR* 05 22 22.5297442838 -71 35 58.151974584 11.583 12.43 12.66 12.85 12.602 WN7 64 0
4 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14537 1
5 * tet01 Ori C ** 05 35 16.46375 -05 23 22.8486 4.20 5.15 5.13 4.91 4.73 O7Vp 1264 1
6 BAT99 77 WR* 05 35 58.889 -69 11 47.88           WN7 66 0
7 HD 269828 EB* 05 35 58.91 -69 11 47.3     13.031   12.837 WN7+O3 71 0
8 RMC 135 WR* 05 38 33.62 -69 04 50.4   12.63 13.48     WN7h+OB 53 0
9 Cl* NGC 2070 MH 57 * 05 38 40.230 -69 05 59.76   12.97 13.0     O3If*/WN6-A 34 1
10 Brey 78 WR* 05 38 40.2960 -69 05 59.640   13.46       O2.5If*/WN6 35 0
11 RMC 140b WR* 05 38 41.5650 -69 05 15.500   12.61 12.66     WN6 23 0
12 BAT99 106 WR* 05 38 42.291 -69 06 03.45   12.83 12.93     WN5h 50 0
13 RMC 136 Cl* 05 38 42.396 -69 06 03.36   9.63 9.50     ~ 1697 2
14 BAT99 112 WR* 05 38 42.9162 -69 06 04.938   12.95 12.86     WN5h 46 0
15 BAT99 113 WR* 05 38 43.12 -69 05 46.8   13.56 13.47     O2If*/WN5 35 0
16 Brey 84 HXB 05 38 44.2507887068 -69 06 06.008788720     13.5     WN5h:a 51 0
17 HD 38282 WR* 05 38 53.3788120199 -69 02 00.896643506   10.98 11.11 11.26   WN5/6h+WN6/7h 146 1
18 HD 269928 WR* 05 38 57.0668705166 -69 06 05.660972436   12.02 11.94 12.00 11.58 WN6/7 116 0
19 * zet Ori A ** 05 40 45.527 -01 56 33.26 0.50 1.77 1.88 1.84 2.04 O9.2IbvarNwk 642 0
20 CD-45 4482 WR* 08 44 47.2902196838 -45 58 55.414166402 10.95 11.29 10.74 10.58   WN8h+? 95 0
21 C 0843-458 OpC 08 44.8 -45 58   6.94 6.8     ~ 36 0
22 V* V712 Car bL* 10 23 58.002 -57 45 48.99 15.452 15.461 13.5 12.6   O3If*/WN6+O3If*/WN6 146 1
23 Cl Westerlund 2 OpC 10 23 58.1 -57 45 49   11.59 10.5     ~ 269 0
24 WR 20b WR* 10 24 18.3972653285 -57 48 29.778301585     13.7 12.0   WN6ha 46 0
25 WR 21a WR* 10 25 56.5023591737 -57 48 43.517827393     12.67     O2If*/WN5 80 0
26 HD 92740 WR* 10 41 17.5154230335 -59 40 36.897706569 5.68 6.50 6.42 7.38   WN7h+O9III-V 376 0
27 HD 93162 WR* 10 44 10.3888220947 -59 43 11.105959983 7.90 8.55 8.80 8.66   O2.5If*/WN6+OB 330 1
28 * eta Car Em* 10 45 03.5455050 -59 41 03.951060 6.37 7.034 6.21 4.90 4.41 OBepec 2170 0
29 Cl* NGC 3603 BLW A1 WR* 11 15 07.31 -61 15 38.4   12.32 11.18     WN6h 57 0
30 Cl* NGC 3603 MDS C WR* 11 15 07.59 -61 15 38.0   12.94 11.89     WN6h 37 0
31 NGC 3603 HII 11 15 24 -61 15.0           ~ 929 2
32 V* BP Cru HXB 12 26 37.5607088371 -62 46 13.259605389   12.70 10.66     B1.5Iaeq 596 0
33 NAME Crux-Scutum Spiral Arm reg 12 30 -60.0           ~ 269 0
34 HD 148937 SB* 16 33 52.3867163783 -48 06 40.476619334 6.49 7.12 6.71 7.61   O6f?p 351 4
35 Cl Westerlund 1 OpC 16 47 04.00 -45 51 04.9           ~ 453 0
36 NGC 6231 OpC 16 54 08.51 -41 49 36.0   2.83 2.6     ~ 479 0
37 HD 152408 s*b 16 54 58.50567 -41 09 03.0964 5.17 5.92 5.77 7.00   O8Iape 346 0
38 NAME OAO 1657-41 HXB 17 00 48.884 -41 39 21.46           Ofpe/WN9 208 0
39 HD 153919 HXB 17 03 56.7728262865 -37 50 38.912077679 6.06 6.78 6.51 6.08 5.90 O6Iafcp 749 1
40 Cl HM 1 OpC 17 18 54 -38 49.0           ~ 39 0
41 NAME Edd-1 WR* 17 45 36.12 -28 56 38.7           WN8-9h 15 0
42 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11244 0
43 WR 102aa WR* 17 45 49.71 -28 49 25.4           WN8-9 20 0
44 WR 102ad WR* 17 45 50.22 -28 49 21.9           WN8-9 22 0
45 WR 102ae WR* 17 45 50.28 -28 49 11.4           WN9h 33 0
46 WR 102ah WR* 17 45 50.43 -28 49 21.9           WN8-9h 29 0
47 WR 102aj WR* 17 45 50.48 -28 49 19.2           WN8-9h 24 0
48 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 620 0
49 WR 102ka WR* 17 46 18.12 -29 01 36.6           WN10 27 0
50 * 9 Sgr Em* 18 03 52.4455370104 -24 21 38.639393923 5.08 5.97 5.97 5.72 5.70 O4V((f))z 514 0
51 HD 164974 * 18 04 59.5802585263 -28 56 24.521310139   10.49 10.51     B7/8V 5 0
52 HD 313846 WR* 18 05 25.7345590489 -23 00 20.335027460 10.48 10.69 9.89 9.89   WN9h+OB 121 0
53 HD 226868 HXB 19 58 21.6758193269 +35 12 05.782512305 9.38 9.72 8.91 8.42   O9.7Iabpvar 3878 0
54 HD 191612 SB* 20 09 28.6111448914 +35 44 01.287772714 7.40 8.07 7.80     O8fpe 209 0
55 BD+40 4227A SB* 20 33 15.0780900764 +41 18 50.478859468 10.42 10.27 8.98 8.03 6.83 O6Ib(fc)+O4.5:III:(fc) 213 0
56 HD 197406 WR* 20 41 21.5486849958 +52 35 15.140677138 10.42 10.87 10.30     WN8h+B3IV/BH 183 0
57 NAME Carina Region reg ~ ~           ~ 148 0

    Equat.    Gal    SGal    Ecl

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2020.02.17-10:24:18

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