2018MNRAS.474.3228P

Query : 2018MNRAS.474.3228P

2018MNRAS.474.3228P - Mon. Not. R. Astron. Soc., 474, 3228-3236 (2018/March-1)

The 155-day X-ray cycle of the very massive Wolf-Rayet star Melnick 34 in the Large Magellanic Cloud.

POLLOCK A.M.T., CROWTHER P.A., TEHRANI K., BROOS P.S. and TOWNSLEY L.K.

Abstract (from CDS):

The Wolf-Rayet star Mk 34 was observed more than 50 times as part of the deep T-ReX Chandra ACIS-I X-ray imaging survey of the Tarantula Nebula in the Large Magellanic Cloud conducted between 2014 May and 2016 January. Its brightness showed one bright maximum and repeated faint minima which help define an X-ray recurrence time of 155.1 ± 0.1 dthat is probably the orbital period of an eccentric binary system. The maximum immediately precedes the minimum in the folded X-ray light curve as confirmed by new Swift XRT observations. Notwithstanding its extreme median luminosity of 1.2 x 1035 erg s–1, which makes it over an order of magnitude brighter than comparable stars in the Milky Way, Mk 34 is almost certainly a colliding-wind binary system. Its spectrum shows phase-related changes of luminosity and absorption that are probably related to the orbital dynamics of two of the most massive stars known.

Abstract Copyright: © 2017 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): shock waves - binaries: eclipsing - stars: massive - stars: winds, outflows - stars: Wolf-Rayet - X-rays: stars

Simbad objects: 33

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Number of rows : 33
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17434 0
2 * del Ori SB* 05 32 00.40009 -00 17 56.7424 0.96 2.02 2.41 2.32 2.54 O9.5IINwk 779 0
3 PSR J0537-6909 Psr 05 37.0 -69 09           ~ 2 0
4 NGC 2060 SNR 05 37 51.4466169456 -69 10 23.947092084   9.69 9.59     ~ 360 2
5 NAME 30 Dor Nebula SFR 05 38 36.0 -69 05 11           ~ 1190 2
6 RMC 140a WR* 05 38 41.5967462055 -69 05 13.457120148   12.18 12.12   12.40 WN4+WC5 35 0
7 RMC 136 Cl* 05 38 42.396 -69 06 03.36   5.81 5.40     ~ 2019 2
8 BAT99 108 WR* 05 38 42.396 -69 06 02.87   12.78 12.77     WN5h 84 0
9 BAT99 112 WR* 05 38 42.9162 -69 06 04.938   12.95 12.86     WN5h 60 0
10 RMC 136a Cl* 05 38 43.3 -69 06 08           ~ 151 2
11 3XMM J053843.7-690605 X 05 38 43.79 -69 06 05.7           ~ 1 0
12 Cl* NGC 2070 MH 859 * 05 38 44.2218 -69 05 56.973   13.67 13.94   13.73 O3III(f+) 25 1
13 Brey 84 HXB 05 38 44.2508644296 -69 06 06.004573020     13.10   12.70 WN5h:a 68 0
14 IGR J05414-6858 HXB 05 41 26.0 -68 58 23           ~ 15 0
15 * zet Pup BY* 08 03 35.04754 -40 00 11.3321 0.89 1.98 2.25 2.36 2.58 O4I(n)fp 1154 1
16 V* V712 Car EB* 10 23 58.0126366512 -57 45 48.937268268 15.466 15.473 13.5 12.6   O3If*/WN6+O3If*/WN6 171 1
17 Cl Westerlund 2 OpC 10 23 58.1 -57 45 49           ~ 356 0
18 THA 35-II-42 WR* 10 25 56.5024585224 -57 48 43.519215708   14.168 12.661 12.102   WN5ha/O3+O3Vz((f*)) 95 0
19 HD 92740 WR* 10 41 17.5158425712 -59 40 36.895992960 5.68 6.50 6.42 7.38   WN7h+O9III-V 412 0
20 HD 93162 WR* 10 44 10.3890266112 -59 43 11.106500520 7.90 8.55 8.80 8.66   O2.5If*/WN6+OB 360 0
21 Cl Trumpler 16 OpC 10 45 00.7 -59 42 00           ~ 484 0
22 NGC 3372 HII 10 45 02.23 -59 41 59.8           ~ 1014 2
23 * eta Car Em* 10 45 03.545808 -59 41 03.95124 6.37 7.03 6.48 6.123 4.41 LBV 2440 0
24 Cl* NGC 3603 BLW A1 WR* 11 15 07.31 -61 15 38.4   12.32 11.18     WN6h 70 0
25 Cl* NGC 3603 MDS C WR* 11 15 07.5851367565 -61 15 38.027795970   12.94 11.89     WN6h 45 0
26 NGC 3603 OpC 11 15 10.8 -61 15 32           ~ 1067 1
27 WR 48a WR* 13 12 39.6052790136 -62 42 55.939362876       16.081   WC6 99 0
28 NAME G305 Complex SFR 13 13 -62.7           ~ 67 0
29 HD 151932 WR* 16 52 19.2477039480 -41 51 16.270066224 6.06 6.79 6.51 7.64   WN7h 313 0
30 HD 191765 WR* 20 10 14.1928045152 +36 10 35.070683376 7.64 8.08 8.08     WN6-s 441 0
31 HD 193576 WR* 20 19 32.4229160448 +38 43 53.959035756 8.15 8.53 8.00     WN5+O6II-V 707 0
32 HD 193793 WR* 20 20 27.9757908696 +43 51 16.286840244 6.90 7.25 6.85 4.58   WC7pd+O5.5fc 710 0
33 NAME Local Group GrG ~ ~           ~ 8391 0

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