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dc.contributor.authorBarlow, M.J.
dc.contributor.authorDrew, J.E.
dc.contributor.authorMeaburn, J.
dc.contributor.authorMassey, R.M.
dc.identifier.citationBarlow , M J , Drew , J E , Meaburn , J & Massey , R M 1994 , ' The shock-excited P-Cygni nebula ' , Monthly Notices of the Royal Astronomical Society , vol. 268 , no. 2 , pp. L29-L34 .
dc.identifier.otherPURE: 175933
dc.identifier.otherPURE UUID: 3a2a1ac8-3a4f-44db-905c-b30ece3ee1ac
dc.identifier.otherdspace: 2299/4049
dc.identifier.otherScopus: 0002765361
dc.descriptionOriginal article can be found at: Copyright Royal Astronomical Society [Full text of this article is not available in the UHRA]
dc.description.abstractWe have obtained images in the [N II] λ6584 line of the nebula around the luminous blue variable star P Cygni, using a 4 arcsec wide occulting strip. A nearly circular inner nebula is found, containing many bright condensations, with angular diameters of 21.4 arcsec in the east-west direction and 23.8 arcsec in the north-south direction. Two fainter outer arcs of [N II] emission are also visible, with angular diameters of 1 and 1.5 arcmin. A high-resolution 4900-9000 Å UES spectrum, obtained at a position 9 arcsec west of P Cygni, shows the [N II] λλ7378, 7412 doublet to be the strongest feature emitted by the nebula. High-resolution long-slit MES spectra were obtained at multiple positions across the bright inner nebula in order to investigate the density, dynamics and age of the nebula. Our [N II] λ6584 spectra show broad velocity components with an overall expansion velocity of 140 km s-1, while our [N II] λ7412 spectra show much narrower velocity components with an overall expansion velocity of only 110 km s-1. Our results are consistent with the narrow [N II] emission originating from dense, mainly neutral knots which are being overtaken by the stellar wind from P Cyg at a relative velocity of 100 km s-1, with the broader irregular [N II] and [S II] emission arising from bow shocks around the knots. This model provides a natural explanation for the larger [N II] expansion velocities compared to those of [N II].en
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.titleThe shock-excited P-Cygni nebulaen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
rioxxterms.typeJournal Article/Review

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