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Article: A barium central star binary in the Type I diamond ring planetary nebula Abell 70

TitleA barium central star binary in the Type I diamond ring planetary nebula Abell 70
Authors
KeywordsStars: chemically peculiar
Planetary nebulae: general
Stars: AGB and post-AGB
Binaries: general
Binaries: symbiotic
Planetary nebulae: individual: PN G038.1-25.4
Issue Date2012
Citation
Monthly Notices of the Royal Astronomical Society, 2012, v. 419, n. 1, p. 39-49 How to Cite?
AbstractAbell 70 (PN G038.1-25.4, hereafter A 70) is a planetary nebula known for its diamond ring appearance due to a superposition with a background galaxy. The previously unstudied central star is found to be a binary consisting of a G8IV-V secondary at optical wavelengths and a hot white dwarf at ultraviolet wavelengths. The secondary shows Ba ii and Sr ii features enhanced for its spectral type that, combined with the chromospheric Hα emission and possible 20-30kms-1 radial velocity amplitude, firmly classifies the binary as a Barium star. The proposed origin of Barium stars is intimately linked to planetary nebulae (PNe) whereby wind accretion pollutes the companion with dredged-up material rich in carbon ands-process elements when the primary is experiencing thermal pulses on the asymptotic giant branch (AGB). A 70 provides further evidence for this scenario together with the other very few examples of Barium central stars. The nebula is found to have Type I chemical abundances with helium and nitrogen enrichment, which when combined with future abundance studies of the central star, will establish A 70 as a unique laboratory for studyings-process AGB nucleosynthesis. We also discuss guidelines to discover more binary central stars with cool secondaries in large orbits that are needed to balance our knowledge of binarity in PNe against the currently better studied post-common-envelope binary central stars. © 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS.
Persistent Identifierhttp://hdl.handle.net/10722/208931
ISSN
2015 Impact Factor: 4.952
2015 SCImago Journal Rankings: 2.806

 

DC FieldValueLanguage
dc.contributor.authorMiszalski, Brent-
dc.contributor.authorBoffin, Henri M J-
dc.contributor.authorFrew, David J.-
dc.contributor.authorAcker, Agnès-
dc.contributor.authorKöppen, Joachim-
dc.contributor.authorMoffat, Anthony F J-
dc.contributor.authorParker, Quentin A.-
dc.date.accessioned2015-03-23T02:02:14Z-
dc.date.available2015-03-23T02:02:14Z-
dc.date.issued2012-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, 2012, v. 419, n. 1, p. 39-49-
dc.identifier.issn0035-8711-
dc.identifier.urihttp://hdl.handle.net/10722/208931-
dc.description.abstractAbell 70 (PN G038.1-25.4, hereafter A 70) is a planetary nebula known for its diamond ring appearance due to a superposition with a background galaxy. The previously unstudied central star is found to be a binary consisting of a G8IV-V secondary at optical wavelengths and a hot white dwarf at ultraviolet wavelengths. The secondary shows Ba ii and Sr ii features enhanced for its spectral type that, combined with the chromospheric Hα emission and possible 20-30kms-1 radial velocity amplitude, firmly classifies the binary as a Barium star. The proposed origin of Barium stars is intimately linked to planetary nebulae (PNe) whereby wind accretion pollutes the companion with dredged-up material rich in carbon ands-process elements when the primary is experiencing thermal pulses on the asymptotic giant branch (AGB). A 70 provides further evidence for this scenario together with the other very few examples of Barium central stars. The nebula is found to have Type I chemical abundances with helium and nitrogen enrichment, which when combined with future abundance studies of the central star, will establish A 70 as a unique laboratory for studyings-process AGB nucleosynthesis. We also discuss guidelines to discover more binary central stars with cool secondaries in large orbits that are needed to balance our knowledge of binarity in PNe against the currently better studied post-common-envelope binary central stars. © 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS.-
dc.languageeng-
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society-
dc.subjectStars: chemically peculiar-
dc.subjectPlanetary nebulae: general-
dc.subjectStars: AGB and post-AGB-
dc.subjectBinaries: general-
dc.subjectBinaries: symbiotic-
dc.subjectPlanetary nebulae: individual: PN G038.1-25.4-
dc.titleA barium central star binary in the Type I diamond ring planetary nebula Abell 70-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1111/j.1365-2966.2011.19667.x-
dc.identifier.scopuseid_2-s2.0-83555166163-
dc.identifier.volume419-
dc.identifier.issue1-
dc.identifier.spage39-
dc.identifier.epage49-
dc.identifier.eissn1365-2966-

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