2018A&A...617A..66L


Query : 2018A&A...617A..66L

2018A&A...617A..66L - Astronomy and Astrophysics, volume 617A, 66-66 (2018/9-1)

The Arches cluster revisited. II. A massive eclipsing spectroscopic binary in the Arches cluster.

LOHR M.E., CLARK J.S., NAJARRO F., PATRICK L.R., CROWTHER P.A. and EVANS C.J.

Abstract (from CDS):

We have carried out a spectroscopic variability survey of some of the most massive stars in the Arches cluster, using K-band observations obtained with SINFONI on the VLT. One target, F2, exhibits substantial changes in radial velocity (RV); in combination with new KMOS and archival SINFONI spectra, its primary component is found to undergo RV variation with a period of 10.483±0.002 d and an amplitude of ∼350km/s. A secondary RV curve is also marginally detectable. We reanalysed archival NAOS-CONICA photometric survey data in combination with our RV results to confirm this object as an eclipsing SB2 system, and the first binary identified in the Arches. We have modelled it as consisting of an 82±12M WN8-9h primary and a 60±8M O5-6 Ia+ secondary, and as having a slightly eccentric orbit, implying an evolutionary stage prior to strong binary interaction. As one of four X-ray bright Arches sources previously proposed as colliding-wind massive binaries, it may be only the first of several binaries to be discovered in this cluster, presenting potential challenges to recent models for the Arches' age and composition. It also appears to be one of the most massive binaries detected to date; the primary's calculated initial mass of ≥120M would arguably make this the most massive binary known in the Galaxy.

Abstract Copyright: © ESO 2018

Journal keyword(s): stars: individual: F2 - stars: massive - stars: Wolf-Rayet - binaries: close - binaries: eclipsing - binaries: spectroscopic

VizieR on-line data: <Available at CDS (J/A+A/617/A66): list.dat f2prim.dat f2sec.dat and 25 spectra>

Simbad objects: 27

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Number of rows : 27
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 HD 38282 WR* 05 38 53.3788120199 -69 02 00.896643506   10.98 11.11 11.26   WN5/6h+WN6/7h 153 1
2 HD 269928 WR* 05 38 57.0668705166 -69 06 05.660972436   12.02 11.94 12.00 11.58 WN6/7 122 0
3 V* V712 Car EB* 10 23 58.0120989646 -57 45 48.938103165 15.466 15.473 13.5 12.6   O3If*/WN6+O3If*/WN6 150 1
4 WR 21a WR* 10 25 56.5023591737 -57 48 43.517827393     12.67     O2If*/WN5 82 0
5 HD 92740 WR* 10 41 17.5154230335 -59 40 36.897706569 5.68 6.50 6.42 7.38   WN7h+O9III-V 389 0
6 HD 93162 WR* 10 44 10.3888220947 -59 43 11.105959983 7.90 8.55 8.80 8.66   O2.5If*/WN6+OB 345 1
7 THA 35-II-117 WR* 10 50 46.2932996756 -60 28 41.246441676   13.29 12.36 12.05   WN7h+O 44 0
8 Cl* NGC 3603 BLW A1 WR* 11 15 07.31 -61 15 38.4   12.32 11.18     WN6h 60 0
9 WR 77o WR* 16 47 05.37 -45 51 04.7     20.99 17.50 14.37 WN7o 22 0
10 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12299 0
11 [LGR2001] AR10 Rad 17 45 49.69 -28 49 25.9           ~ 3 0
12 WR 102aa WR* 17 45 49.71 -28 49 25.4           WN8-9 23 0
13 CXOGCS J174549.73-284926.1 X 17 45 49.73 -28 49 26.1           ~ 2 0
14 [FNG2002] 19 Rad 17 45 49.82 -28 49 26.5           ~ 8 0
15 [BSP2001] 30 Em* 17 45 50.08 -28 49 26.1           O4-6If 18 0
16 [BSP2001] 29 Em* 17 45 50.15 -28 49 26.8           ~ 10 0
17 WR 102ad WR* 17 45 50.22 -28 49 21.9           WN8-9 24 0
18 WR 102ae WR* 17 45 50.28 -28 49 11.4           WN9h 35 0
19 WR 102ah WR* 17 45 50.43 -28 49 21.9           WN8-9h 31 0
20 WR 102aj WR* 17 45 50.48 -28 49 19.2           WN8-9h 26 0
21 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 665 0
22 WR 102ak WR* 17 45 50.54 -28 49 20.3           WN8-9 16 0
23 WR 102ba WR* 17 45 50.69 -28 49 22.2           WN8-9 16 0
24 [BSP2001] 10 Em* 17 45 50.76 -28 49 17.5           O4-6I 8 0
25 [BSP2001] 8 Em* 17 45 50.76 -28 49 16.2           O4-6If 20 0
26 NAME Quintuplet Cluster OpC 17 46 13.9 -28 49 48           ~ 474 0
27 GrW 150914 GWE ~ ~           ~ 439 1

    Equat.    Gal    SGal    Ecl

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2021.07.25-14:43:58

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