2004MNRAS.351..206D


Query : 2004MNRAS.351..206D

2004MNRAS.351..206D - Mon. Not. R. Astron. Soc., 351, 206-214 (2004/June-2)

Discovery of a WO star in the Scutum-Crux arm of the inner Galaxy.

DREW J.E., BARLOW M.J., UNRUH Y.C., PARKER Q.A., WESSON R., PIERCE M.J., MASHEDER M.R.W. and PHILLIPPS S.

Abstract (from CDS):

We report the discovery of only the fourth massive WO star to be found in the Milky Way, and only the seventh identified within the Local Group. This has resulted from the first observations made in a programme of follow-up spectroscopy of candidate emission-line stars from the AAO/UKST Southern Galactic Plane Hα Survey. The optical spectrum of this star, to become WR 93b in the Catalogue of Galactic Wolf-Rayet stars, is presented and described. WR 93b is classified as WO3 and is shown to be highly reddened [E(B-V) = 2.1±0.1]. A recombination-line analysis of the emission lines yields the abundance ratios C/He = 0.95 and O/He = 0.13 (by number). Comparisons at near-infrared wavelengths of reddening-corrected photometry between WR 93b and both of Sand 2 (WO3, D= 49 kpc) and Sand 5 (WO2, D= 1.75 kpc) yield a consistent distance to WR 93b of 3.4 kpc. Positioned at Galactic coordinates, the star is most likely located in the Scutum-Crux arm of the inner Milky Way. We note that none of the four Galactic WO stars lies significantly beyond the solar circle (with two well inside).

Estimation of the wind terminal velocity in WR 93b at 5750 km/s makes this star the current wind-speed record holder among all non-degenerate stars.


Abstract Copyright: 2004 RAS

Journal keyword(s): surveys - stars: distances - stars: individual: WR 93b - stars: Wolf - Rayet - Galaxy: stellar content

Simbad objects: 14

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Number of rows : 14
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 IC 1613 GiC 01 04 54.2 +02 08 00   10.42 10.01 9.77   ~ 1175 2
2 [AM85] IC 1613 6 WR* 01 05 01.6177966440 +02 04 19.938198792     20.7     WO3 21 1
3 LIN 547 WR* 01 31 04.1367366432 -73 25 03.784411524   12.75 12.90     WO4+O4V 92 0
4 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16278 1
5 Brey 93 WR* 05 39 34.3017622440 -68 44 09.155562972 14.291 15.626 15.204   15.620 WO3 64 0
6 [MS70] 4 WR* 10 51 38.9063499504 -60 56 34.909328328 13.57 13.80 12.78 12.56   WO4+O5III/V((f)) 50 0
7 NAME Crux-Scutum Spiral Arm reg 12 30 -60.0           ~ 297 0
8 HZ 44 HS* 13 23 35.2629445608 +36 07 59.544140304 10.186 11.42 11.65 12.00 11.995 sdBN0VIIHe28 395 0
9 WR 93b WR* 17 32 03.3086687328 -35 04 32.620100844           WO3 16 0
10 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13202 0
11 V* V3893 Sgr WR* 17 45 47.5405102320 -26 10 26.779355616   15.13 14.20 14.23   WR 113 1
12 HD 183143 s*b 19 27 26.5636061496 +18 17 45.193019136 8.25 8.08 6.86 5.74 4.79 B6Ia 426 0
13 WR 142 WR* 20 21 44.3438785440 +37 22 30.544989960   14.39 12.99 12.73 11.04 WO2 126 0
14 NAME Local Group GrG ~ ~           ~ 7778 0

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2022.10.05-20:05:37

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