2010MNRAS.403L..41C


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.12CEST15:48:08

2010MNRAS.403L..41C - Mon. Not. R. Astron. Soc., 403, L41-L45 (2010/March-3)

NGC 300 X-1 is a wolf-rayet/black hole binary.

CROWTHER P.A., BARNARD R., CARPANO S., CLARK J.S., DHILLON V.S. and POLLOCK A.M.T.

Abstract (from CDS):

We present Very Large Telescope/FORS2 time-series spectroscopy of the Wolf-Rayet (WR) star {num}41 in the Sculptor group galaxy NGC 300. We confirm a physical association with NGC 300 X-1, since radial velocity variations of the Heii λ4686 line indicate an orbital period of 32.3±0.2h which agrees at the 2σ level with the X-ray period from Carpano et al. We measure a radial velocity semi-amplitude of 267±8km/s, from which a mass function of 2.6±0.3M is obtained. A revised spectroscopic mass for the WN-type companion of 26+7–5M yields a black hole mass of 20±4M for a preferred inclination of 60°-75°. If the WR star provides half of the measured visual continuum flux, a reduced WR (black hole) mass of 15+4–2.5M(14.5+3–2.5M) would be inferred. As such, {num}41/NGC 300 X-1 represents only the second extragalactic WR plus black hole binary system, after IC 10 X-1. In addition, the compact object responsible for NGC 300 X-1 is the second highest stellar-mass black hole known to date, exceeded only by IC 10 X-1.

Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS

Journal keyword(s): stars: Wolf-Rayet - galaxies: individual: NGC 300 - X-rays: binaries - X-rays: individual: NGC 300 X-1

Simbad objects: 20

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Number of rows : 20

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 IC 10 G 00 20 23.16 +59 17 34.7   13.6 9.5     ~ 1008 0
2 [MAC92] 17-A WR* 00 20 29.05 +59 16 52.3     22.5     WNE 14 0
3 NAME IC 10 X-1 HXB 00 20 29.09 +59 16 51.9           ~ 148 0
4 [SCA2003] 9 WR* 00 54 47.69 -37 42 45.3     20.62     WN 2 0
5 NGC 300 GiG 00 54 53.4460065856 -37 41 03.182962667 8.83 8.69 8.13 7.46   ~ 1306 2
6 NAME NGC 300 X-1 HXB 00 55 09.990 -37 42 12.16     22.44     WNE 103 1
7 NAME Scl Group GrG 01 00 06 -33 44.2           ~ 462 0
8 NAME M33 X-7 HXB 01 33 34.13 +30 32 11.3 17.50 18.80 18.70     O 127 2
9 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5135 1
10 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14832 1
11 BAT99 78 WR* 05 35 59.085 -69 11 51.12   13.07 12.94     WN6(+O8V) 21 0
12 X LMC X-3 HXB 05 38 56.6325045489 -64 05 03.321118015   17 17.2     B2.5Ve 630 0
13 X LMC X-1 HXB 05 39 38.8285930597 -69 44 35.533031148   14.8 14.5     O8(f)p 560 2
14 L 595-22 PM* 05 56 24.7419816722 -27 51 32.362978169   12.31 12.38     sdG 142 0
15 HD 49798 HXB 06 48 04.7000758397 -44 18 58.432035331 6.758 8.017 8.287 8.391 8.543 sdO6 283 0
16 WR 49 WR* 13 13 51.3090989970 -65 18 08.897671074   13.59 13.40 13.51   WN5(h)-w 39 0
17 V* V4641 Sgr HXB 18 19 21.6342721789 -25 24 25.849323550     13.654   13.092 B9III 386 1
18 HD 226868 HXB 19 58 21.6758193269 +35 12 05.782512305 9.38 9.72 8.91 8.42   O9.7Iabpvar 3925 0
19 CD-30 17706 WD* 20 10 56.8485174654 -30 13 06.629141494 11.654 12.286 12.242 12.311 12.381 DA3.1 219 0
20 V* V1521 Cyg HXB 20 32 25.78 +40 57 27.9           WN4/5-6/7 1765 2

    Equat.    Gal    SGal    Ecl

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2020.07.12-15:48:08

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