eprintid: 10110690
rev_number: 14
eprint_status: archive
userid: 608
dir: disk0/10/11/06/90
datestamp: 2020-09-23 13:59:36
lastmod: 2022-01-21 23:54:43
status_changed: 2020-09-23 13:59:36
type: article
metadata_visibility: show
creators_name: Drew, JE
creators_name: Barlow, MJ
creators_name: Unruh, YC
creators_name: Parker, QA
creators_name: Wesson, R
creators_name: Pierce, MJ
creators_name: Masheder, MRW
creators_name: Phillipps, S
title: Discovery of a WO star in the Scutum-Crux arm of the inner Galaxy
ispublished: pub
divisions: UCL
divisions: B04
divisions: C06
divisions: F60
keywords: surveys, stars : distances, stars : individual : WR 93b, stars : Wolf-Rayet, Galaxy : stellar content
note: This version is the version of record. For information on re-use, please refer to the publisher's terms and conditions.
abstract: 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 lambda = 353^{\circ}.27, beta = -0^{\circ}.85, 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^{-1} makes this star the current wind-speed record holder among all non-degenerate stars.
date: 2004-06
date_type: published
publisher: OXFORD UNIV PRESS
official_url: https://doi.org/10.1111/j.1365-2966.2004.07771.x
oa_status: green
full_text_type: pub
language: eng
primo: open
primo_central: open_green
verified: verified_manual
elements_id: 49509
doi: 10.1111/j.1365-2966.2004.07771.x
lyricists_name: Barlow, Michael
lyricists_name: Drew, Janet
lyricists_name: Wesson, Roger
lyricists_id: MJBAR75
lyricists_id: JEDRE89
lyricists_id: RWESS64
actors_name: Kalinowski, Damian
actors_id: DKALI47
actors_role: owner
full_text_status: public
publication: Monthly Notices of the Royal Astronomical Society
volume: 351
number: 1
pagerange: 206-214
pages: 9
citation:        Drew, JE;    Barlow, MJ;    Unruh, YC;    Parker, QA;    Wesson, R;    Pierce, MJ;    Masheder, MRW;           Drew, JE;  Barlow, MJ;  Unruh, YC;  Parker, QA;  Wesson, R;  Pierce, MJ;  Masheder, MRW;  Phillipps, S;   - view fewer <#>    (2004)    Discovery of a WO star in the Scutum-Crux arm of the inner Galaxy.                   Monthly Notices of the Royal Astronomical Society , 351  (1)   pp. 206-214.    10.1111/j.1365-2966.2004.07771.x <https://doi.org/10.1111/j.1365-2966.2004.07771.x>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/10110690/1/Barlow_Discovery%20of%20a%20WO%20star%20in%20the%20Scutum-Crux%20arm%20of%20the%20inner%20Galaxy_VoR.pdf