A barium central star binary in the Type I diamond ring planetary nebula Abell 70
Identifieur interne : 005F23 ( Main/Exploration ); précédent : 005F22; suivant : 005F24A barium central star binary in the Type I diamond ring planetary nebula Abell 70
Auteurs : B. Miszalski [Afrique du Sud, Royaume-Uni] ; H. M. J. Boffin [Chili] ; D. J. Frew [Australie] ; A. Acker [France] ; J. Köppen [France, Allemagne] ; A. F. J. Moffat [Canada] ; Q. A. Parker [Australie]Source :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2012.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
Abstract
Abell 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 20-30 km s-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 and s-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 studying s-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.
Affiliations:
- Afrique du Sud, Allemagne, Australie, Canada, Chili, France, Royaume-Uni
- Alsace (région administrative), Grand Est
- Strasbourg
- Université de Strasbourg
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Acker</name><affiliation wicri:level="4"><inist:fA14 i1="06"><s1>Observatoire Astronomique de Strasbourg, Université de Strasbourg, CNRS, UMR 7550, 11 rue de l'Université</s1><s2>67000 Strasbourg</s2><s3>FRA</s3><sZ>4 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>67000 Strasbourg</wicri:noRegion><placeName><settlement type="city">Strasbourg</settlement><region type="region" nuts="2">Grand Est</region><region type="old region" nuts="2">Alsace (région administrative)</region><settlement type="city">Strasbourg</settlement></placeName><orgName type="university">Université de Strasbourg</orgName></affiliation></author><author><name sortKey="Koppen, J" sort="Koppen, J" uniqKey="Koppen J" first="J." last="Köppen">J. 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F. J." last="Moffat">A. F. J. Moffat</name><affiliation wicri:level="1"><inist:fA14 i1="09"><s1>Déptartment de physique, Université de Montreal C.P. 6128, Succ. Centre-Ville</s1><s2>Montréal, QC H3C 3J7</s2><s3>CAN</s3><sZ>6 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>Montréal, QC H3C 3J7</wicri:noRegion></affiliation><affiliation wicri:level="1"><inist:fA14 i1="10"><s1>Centre de recherche en astrophysique du Quebec</s1><s3>CAN</s3><sZ>6 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>Centre de recherche en astrophysique du Quebec</wicri:noRegion></affiliation></author><author><name sortKey="Parker, Q A" sort="Parker, Q A" uniqKey="Parker Q" first="Q. A." last="Parker">Q. A. Parker</name><affiliation wicri:level="1"><inist:fA14 i1="05"><s1>Department of Physics and Astronomy, Macquarie University Sydney</s1><s2>NSW 2109</s2><s3>AUS</s3><sZ>3 aut.</sZ><sZ>7 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>NSW 2109</wicri:noRegion></affiliation><affiliation wicri:level="1"><inist:fA14 i1="11"><s1>Australian Astronomical Observatory</s1><s2>Epping, NSW 1710</s2><s3>AUS</s3><sZ>7 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Australian Astronomical Observatory</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Monthly Notices of the Royal Astronomical Society</title><title level="j" type="abbreviated">Mon. Not. R. Astron. Soc.</title><idno type="ISSN">0035-8711</idno><imprint><date when="2012">2012</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Monthly Notices of the Royal Astronomical Society</title><title level="j" type="abbreviated">Mon. Not. R. Astron. Soc.</title><idno type="ISSN">0035-8711</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Abundance</term><term>Accretion</term><term>Asymptotic giant branch</term><term>Baryum star</term><term>Binary stars</term><term>Central stars</term><term>Chemically peculiar star</term><term>Cool star</term><term>Galaxies</term><term>H-alpha lines</term><term>Nucleosynthesis</term><term>Orbits</term><term>Planetary nebulae</term><term>Planetary rings</term><term>Radial velocity</term><term>Spectral type</term><term>White dwarf stars</term><term>s process</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Etoile baryum</term><term>Etoile centrale</term><term>Binaire</term><term>Anneau planétaire</term><term>Nébuleuse planétaire</term><term>Galaxies</term><term>Naine blanche</term><term>Type spectral</term><term>Raie H alpha</term><term>Vitesse radiale</term><term>Accrétion</term><term>Processus s</term><term>Branche géante asymptotique</term><term>Abondance</term><term>Nucléosynthèse</term><term>Etoile froide</term><term>Orbite</term><term>Etoile chimiquement particulière</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Abell 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 20-30 km s<sup>-1</sup> 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 and s-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 studying s-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.</div></front></TEI><affiliations><list><country><li>Afrique du Sud</li><li>Allemagne</li><li>Australie</li><li>Canada</li><li>Chili</li><li>France</li><li>Royaume-Uni</li></country><region><li>Alsace (région administrative)</li><li>Grand Est</li></region><settlement><li>Strasbourg</li></settlement><orgName><li>Université de Strasbourg</li></orgName></list><tree><country name="Afrique du Sud"><noRegion><name sortKey="Miszalski, B" sort="Miszalski, B" uniqKey="Miszalski B" first="B." last="Miszalski">B. Miszalski</name></noRegion><name sortKey="Miszalski, B" sort="Miszalski, B" uniqKey="Miszalski B" first="B." last="Miszalski">B. Miszalski</name></country><country name="Royaume-Uni"><noRegion><name sortKey="Miszalski, B" sort="Miszalski, B" uniqKey="Miszalski B" first="B." last="Miszalski">B. Miszalski</name></noRegion></country><country name="Chili"><noRegion><name sortKey="Boffin, H M J" sort="Boffin, H M J" uniqKey="Boffin H" first="H. M. J." last="Boffin">H. M. J. Boffin</name></noRegion></country><country name="Australie"><noRegion><name sortKey="Frew, D J" sort="Frew, D J" uniqKey="Frew D" first="D. J." last="Frew">D. J. Frew</name></noRegion><name sortKey="Parker, Q A" sort="Parker, Q A" uniqKey="Parker Q" first="Q. A." last="Parker">Q. A. Parker</name><name sortKey="Parker, Q A" sort="Parker, Q A" uniqKey="Parker Q" first="Q. A." last="Parker">Q. A. Parker</name></country><country name="France"><region name="Grand Est"><name sortKey="Acker, A" sort="Acker, A" uniqKey="Acker A" first="A." last="Acker">A. Acker</name></region><name sortKey="Koppen, J" sort="Koppen, J" uniqKey="Koppen J" first="J." last="Köppen">J. Köppen</name><name sortKey="Koppen, J" sort="Koppen, J" uniqKey="Koppen J" first="J." last="Köppen">J. Köppen</name></country><country name="Allemagne"><noRegion><name sortKey="Koppen, J" sort="Koppen, J" uniqKey="Koppen J" first="J." last="Köppen">J. Köppen</name></noRegion></country><country name="Canada"><noRegion><name sortKey="Moffat, A F J" sort="Moffat, A F J" uniqKey="Moffat A" first="A. F. J." last="Moffat">A. F. J. Moffat</name></noRegion><name sortKey="Moffat, A F J" sort="Moffat, A F J" uniqKey="Moffat A" first="A. F. J." last="Moffat">A. F. J. Moffat</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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