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dc.contributor.authorStasinska, G.
dc.contributor.authorMorisset, C.
dc.contributor.authorTovmassian, G.
dc.contributor.authorRauch, T.
dc.contributor.authorRicher, M.G.
dc.contributor.authorPena, M.
dc.contributor.authorSzczerba, R.
dc.contributor.authorDecressin, T.
dc.contributor.authorCharbonnel, C.
dc.contributor.authorYungelson, L.
dc.contributor.authorNapiwotzki, R.
dc.contributor.authorSimon-Diaz, S.
dc.contributor.authorJamet, L.
dc.date.accessioned2010-04-12T09:13:54Z
dc.date.available2010-04-12T09:13:54Z
dc.date.issued2010
dc.identifier.citationStasinska , G , Morisset , C , Tovmassian , G , Rauch , T , Richer , M G , Pena , M , Szczerba , R , Decressin , T , Charbonnel , C , Yungelson , L , Napiwotzki , R , Simon-Diaz , S & Jamet , L 2010 , ' The chemical composition of TS 01, the most oxygen-deficient planetary nebula AGB nucleosynthesis in a metal-poor binary star ' , Astronomy and Astrophysics , vol. 511 . https://doi.org/10.1051/0004-6361/200912405
dc.identifier.issn0004-6361
dc.identifier.otherPURE: 155525
dc.identifier.otherPURE UUID: 94b420b8-be0b-404b-823e-275869a22bfe
dc.identifier.otherdspace: 2299/4397
dc.identifier.otherScopus: 79952857623
dc.identifier.urihttp://hdl.handle.net/2299/4397
dc.descriptionOriginal article can be found at: http://www.aanda.org/ Copyright The European Southern Observatory (ESO)
dc.description.abstractThe planetary nebula TS 01 (also called PN G 135.9+55.9 or SBS 1150+599A) with its record-holding low oxygen abundance and its double degenerate close binary core (period 3.9 h) is an exceptional object located in the Galactic halo.
We have secured observational data in a complete wavelength range to pin down the abundances of half a dozen elements in the nebula. The abundances are obtained via detailed photoionization modelling which takes into account all the observational constraints (including geometry and aperture effects) using the pseudo-3D photoionization code Cloudy_3D. The spectral energy distribution of the ionizing radiation is taken from appropriate model atmospheres. Incidentally we find from the new observational constraints that both stellar components contribute to the ionization: the “cool” one provides the bulk of hydrogen ionization, while the “hot” one is responsible for the presence of the most highly charged ions, which explains why previous attempts to model the nebula experienced difficulties. 
The nebular abundances of C, N, O, and Ne are found to be 1/3.5, 1/4.2, 1/70, and 1/11 of the solar value respectively, with uncertainties of a factor 2. Thus the extreme O deficiency of this object is confirmed. The abundances of S and Ar are less than 1/30 of solar. The abundance of He relative to H is 0.089 ± 0.009. 
Standard models of stellar evolution and nucleosynthesis cannot explain the abundance pattern observed in the nebula. To obtain an extreme oxygen deficiency in a star whose progenitor has an initial mass of about [...] requires an additional mixing process, which can be induced by stellar rotation and/or by the presence of the close companion. We have computed a stellar model with an initial mass of [...] , appropriate metallicity, and initial rotation of 100 km s-1, and find that rotation greatly improves the agreement between the predicted and observed abundances. [...] see original online versionen
dc.language.isoeng
dc.relation.ispartofAstronomy and Astrophysics
dc.titleThe chemical composition of TS 01, the most oxygen-deficient planetary nebula AGB nucleosynthesis in a metal-poor binary staren
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
rioxxterms.versionofrecordhttps://doi.org/10.1051/0004-6361/200912405
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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