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dc.contributor.authorAkras, S.
dc.contributor.authorClyne, N.
dc.contributor.authorBoumis, P.
dc.contributor.authorMonteiro, H.
dc.contributor.authorGonçalves, D. R.
dc.contributor.authorRedman, M. P.
dc.contributor.authorWilliams, S.
dc.date.accessioned2018-09-20T15:59:17Z
dc.date.available2018-09-20T15:59:17Z
dc.date.issued2016-02-23
dc.identifier.citationAkras, S. Clyne, N.; Boumis, P.; Monteiro, H.; Gonçalves, D. R.; Redman, M. P.; Williams, S. (2016). Deciphering the bipolar planetary nebula abell 14 with 3d ionization and morphological studies. Monthly Notices of the Royal Astronomical Society 457 (4), 3409-3419
dc.identifier.issn0035-8711,1365-2966
dc.identifier.urihttp://hdl.handle.net/10379/10176
dc.description.abstractAbell 14 is a poorly studied object despite being considered a born-again planetary nebula. We performed a detailed study of its 3D morphology and ionization structure using the SHAPE and MOCASSIN codes. We found that Abell 14 is a highly evolved, bipolar nebula with a kinematical age of similar to 19 400 yr for a distance of 4 kpc. The high He abundance, and N/O ratio indicate a progenitor of 5 M-circle dot that has experienced the third dredge-up and hot bottom burning phases. The stellar parameters of the central source reveal a star at a highly evolved stage near to the white dwarf cooling track, being inconsistent with the born-again scenario. The nebula shows unexpectedly strong [N I] lambda 5200 and [O I] lambda 6300 emission lines indicating possible shock interactions. Abell 14 appears to be a member of a small group of highly evolved, extreme type-I planetary nebulae (PNe). The members of this group lie at the lower-left corner of the PNe regime on the [NII]/H alpha versus [S II]/H alpha diagnostic diagram, where shock-excited regions/objects are also placed. The low luminosity of their central stars, in conjunction with the large physical size of the nebulae, result in a very low photoionization rate, which can make any contribution of shock interaction easily perceptible, even for small velocities.
dc.publisherOxford University Press (OUP)
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.subjectbinaries: general
dc.subjectism: abundances
dc.subjectism: kinematics and dynamics
dc.subjectplanetary nebulae: individual: abell 14
dc.subjectintermediate-mass stars
dc.subjectgalactic bulge region
dc.subjectagb stars
dc.subjectsuwt 2
dc.subjectevolution
dc.subjectphotoionization
dc.subjectdistances
dc.subjectcatalog
dc.subjectbinary
dc.subjectabundances
dc.titleDeciphering the bipolar planetary nebula abell 14 with 3d ionization and morphological studies
dc.typeArticle
dc.identifier.doi10.1093/mnras/stw038
dc.local.publishedsourcehttp://arxiv.org/pdf/1601.02170
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