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dc.contributor.authorRaddi, R.
dc.contributor.authorDrew, J.E.
dc.contributor.authorFarnhill, H.J.
dc.contributor.authorFabregat, J.
dc.contributor.authorSteeghs, D.
dc.contributor.authorWright, N.J.
dc.contributor.authorDrake, J.J.
dc.contributor.authorSale, S.E.
dc.contributor.authorBarlow, M.J.
dc.contributor.authorGreimel, R.
dc.contributor.authorSabin, L.
dc.contributor.authorCorradi, R.M.L.
dc.date.accessioned2013-06-05T07:15:54Z
dc.date.available2013-06-05T07:15:54Z
dc.date.issued2013-04
dc.identifier.citationRaddi , R , Drew , J E , Farnhill , H J , Fabregat , J , Steeghs , D , Wright , N J , Drake , J J , Sale , S E , Barlow , M J , Greimel , R , Sabin , L & Corradi , R M L 2013 , ' First results of an Hα based search of classical Be stars in the Perseus Arm and beyond ' , Monthly Notices of the Royal Astronomical Society , vol. 430 , no. 3 , pp. 2169-2187 . https://doi.org/10.1093/mnras/stt038
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 1896131
dc.identifier.otherPURE UUID: 6e546d54-99a3-40fd-b0c4-3e4a2a93b224
dc.identifier.otherScopus: 84876811129
dc.identifier.urihttp://hdl.handle.net/2299/10698
dc.description.abstractWe investigate a region of the Galactic plane, between 120° ≤ l ≤ 140° and-1° ≤ b≤+4°, and uncover a population of moderately reddened (E(B-V) ~ 1) classical Be stars within and beyond the Perseus and Outer Arms. 370 candidate emission-line stars (13≲r≲16) selected from the Isaac Newton Telescope Photometric Ha Survey of the Northern Galactic plane have been followed up spectroscopically. A subset of these, 67 stars with properties consistent with those of classical Be stars, have been observed at sufficient spectral resolution (δλ ≈ 2-4 Å) at blue wavelengths to narrow down their spectral types. We determine these to a precision estimated to be ±1 subtype and then we measure reddenings via spectral energy distribution fitting with reference to appropriate model atmospheres. Corrections for contribution to colour excess from circumstellar discs are made using an established scaling to Ha emission equivalent width. Spectroscopic parallaxes are obtained after luminosity class has been constrained via estimates of distances to neighbouring A/F stars with similar reddenings. Overwhelmingly, the stars in the sample are confirmed as luminous classical Be stars at heliocentric distances ranging from 2 kpc up to ~12 kpc. However, the errors are presently too large to enable the cumulative distribution function with respect to distance to distinguish between models placing the stars exclusively in spiral arms, or in a smooth exponentially declining distribution.en
dc.format.extent19
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.titleFirst results of an Hα based search of classical Be stars in the Perseus Arm and beyonden
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionScience & Technology Research Institute
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1093/mnras/stt038
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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