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Article: Discovery of a WO star in the Scutum-Crux arm of the inner galaxy

TitleDiscovery of a WO star in the Scutum-Crux arm of the inner galaxy
Authors
KeywordsStars: individual: WR 93b
Surveys
Stars: distances
Galaxy: stellar content
Stars: Wolf-Rayet
Issue Date2004
Citation
Monthly Notices of the Royal Astronomical Society, 2004, v. 351, n. 1, p. 206-214 How to Cite?
AbstractWe 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 l = 353°.27, b = -0°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.
Persistent Identifierhttp://hdl.handle.net/10722/208846
ISSN
2015 Impact Factor: 4.952
2015 SCImago Journal Rankings: 2.806

 

DC FieldValueLanguage
dc.contributor.authorDrew, Janet E.-
dc.contributor.authorBarlow, Michael J.-
dc.contributor.authorUnruh, Yvonne C.-
dc.contributor.authorParker, Quentin A.-
dc.contributor.authorWesson, Roger-
dc.contributor.authorPierce, Michael J.-
dc.contributor.authorMasheder, M. R W-
dc.contributor.authorPhillipps, Steven-
dc.date.accessioned2015-03-23T02:01:55Z-
dc.date.available2015-03-23T02:01:55Z-
dc.date.issued2004-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, 2004, v. 351, n. 1, p. 206-214-
dc.identifier.issn0035-8711-
dc.identifier.urihttp://hdl.handle.net/10722/208846-
dc.description.abstractWe 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 l = 353°.27, b = -0°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.-
dc.languageeng-
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society-
dc.subjectStars: individual: WR 93b-
dc.subjectSurveys-
dc.subjectStars: distances-
dc.subjectGalaxy: stellar content-
dc.subjectStars: Wolf-Rayet-
dc.titleDiscovery of a WO star in the Scutum-Crux arm of the inner galaxy-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1111/j.1365-2966.2004.07771.x-
dc.identifier.scopuseid_2-s2.0-3042685363-
dc.identifier.volume351-
dc.identifier.issue1-
dc.identifier.spage206-
dc.identifier.epage214-

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