First results of an H alpha based search of classical Be stars in the Perseus Arm and beyond

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dc.contributor.authorRaddi, R.
dc.contributor.authorDrew, J. E.
dc.contributor.authorFabregat, J.
dc.contributor.authorSteeghs, D.
dc.contributor.authorWright, N. J.
dc.contributor.authorSale, S. E.
dc.contributor.authorFarnhill, H. J.
dc.contributor.authorBarlow, M. J.
dc.contributor.authorGreimel, R.
dc.contributor.authorSabin, L.
dc.contributor.authorCorradi, R. M. L.
dc.contributor.authorDrake, J. J.
dc.date.accessioned2024-01-10T12:05:31Z
dc.date.available2024-01-10T12:05:31Z
dc.date.issued2013
dc.description.abstractWe investigate a region of the Galactic plane, between 120 degrees <= l <= 140 degrees and -1 degrees <= b <= +4 degrees, and uncover a population of moderately reddened (E(B - V) similar to 1) classical Be stars within and beyond the Perseus and Outer Arms. 370 candidate emission-line stars (13 less than or similar to r less than or similar to 16) selected from the Isaac Newton Telescope Photometric H alpha 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 (Delta lambda approximate to 2-4 angstrom) 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 H alpha 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 similar to 2 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.
dc.description.funderUniversity of Hertfordshire
dc.description.funderSpanish Plan Nacional de I+D+i
dc.description.funderFEDER
dc.description.funderGeneralitat Valenciana
dc.description.funderMinistry for the Economy, Development, and Tourism's Programa Iniciativa Cientifica Milenio
dc.description.funderScience and Technology Facilities Council
dc.fechaingreso.objetodigital2024-05-07
dc.format.extent19 páginas
dc.fuente.origenWOS
dc.identifier.doi10.1093/mnras/stt038
dc.identifier.eissn1365-2966
dc.identifier.issn0035-8711
dc.identifier.urihttps://doi.org/10.1093/mnras/stt038
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/76022
dc.identifier.wosidWOS:000319260500052
dc.information.autorucIngeniería;Sale S;S/I;213633
dc.issue.numero3
dc.language.isoen
dc.nota.accesoSin adjunto
dc.pagina.final2187
dc.pagina.inicio2169
dc.publisherOXFORD UNIV PRESS
dc.revistaMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
dc.rightsregistro bibliográfico
dc.subjectstars: early-type
dc.subjectstars: emission-line, Be
dc.subjectdust, extinction
dc.subjectISM: structure
dc.subjectGalaxy: structure
dc.subjectT-TAURI STARS
dc.subjectSPIRAL STRUCTURE
dc.subjectMILKY-WAY
dc.subjectABSOLUTE MAGNITUDES
dc.subjectINTERSTELLAR-MEDIUM
dc.subjectGALACTIC STRUCTURE
dc.subjectPARAMETERS
dc.subjectEMISSION
dc.subjectIPHAS
dc.subjectDISTANCE
dc.subject.ods11 Sustainable Cities and Communities
dc.subject.odspa11 Ciudades y comunidades sostenibles
dc.titleFirst results of an H alpha based search of classical Be stars in the Perseus Arm and beyond
dc.typeartículo
dc.volumen430
sipa.codpersvinculados213633
sipa.indexWOS
sipa.indexScopus
sipa.trazabilidadCarga SIPA;09-01-2024
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