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  • Danilovich, T.Katholieke Universiteit Leuven (author)

ATOMIUM: halide molecules around the S-type AGB star W Aquilae

  • Article/chapterEnglish2021

Publisher, publication year, extent ...

  • 2021-11-24
  • EDP Sciences,2021
  • electronicrdacarrier

Numbers

  • LIBRIS-ID:oai:research.chalmers.se:695299d3-a804-4f6a-892b-5c3c693ce8cd
  • https://research.chalmers.se/publication/527388URI
  • https://doi.org/10.1051/0004-6361/202141757DOI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • Context. S-type asymptotic giant branch (AGB) stars are thought to be intermediates in the evolution of oxygen- to carbon-rich AGB stars. The chemical compositions of their circumstellar envelopes are also intermediate but have not been studied in as much detail as their carbon- and oxygen-rich counterparts. W Aql is a nearby S-type star, with well-known circumstellar parameters, making it an ideal object for in-depth study of less common molecules. Aims. We aim to determine the abundances of AlCl and AlF from rotational lines, which have been observed for the first time towards an S-type AGB star. In combination with models based on PACS observations, we aim to update our chemical kinetics network based on these results. Methods. We analyse ALMA observations towards W Aql of AlCl in the ground and first two vibrationally excited states and AlF in the ground vibrational state. Using radiative transfer models, we determine the abundances and spatial abundance distributions of (AlCl)-Cl-35, (AlCl)-Cl-37, and AlF. We also model HCl and HF emission and compare these models to PACS spectra to constrain the abundances of these species. Results. AlCl is found in clumps very close to the star, with emission confined within 0 ''.1 of the star. AlF emission is more extended, with faint emission extending 0 ''.2 to 0 ''.6 from the continuum peak. We find peak abundances, relative to H-2, of 1.7 x 10(-7) for (AlCl)-Cl-35, 7 x 10(-8) for (AlCl)-Cl-37, and 1 x 10(-7) for AlF. From the PACS spectra, we find abundances of 9.7 x 10(-8) and <= 10(-8), relative to H-2, for HCl and HF, respectively. Conclusions. The AlF abundance exceeds the solar F abundance, indicating that fluorine synthesised in the AGB star has already been dredged up to the surface of the star and ejected into the circumstellar envelope. From our analysis of chemical reactions in the wind, we conclude that AlF may participate in the dust formation process, but we cannot fully explain the rapid depletion of AlCl seen in the wind.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • van de Sande, M.Katholieke Universiteit Leuven (author)
  • Plane, J. M. C.University of Leeds (author)
  • Millar, T. J.Queen's University Belfast (author)
  • Royer, P.Katholieke Universiteit Leuven (author)
  • Amor, M. A.Université de Tunis El Manar (author)
  • Hammami, K.Université de Tunis El Manar (author)
  • Decock, L.Katholieke Universiteit Leuven (author)
  • Gottlieb, C. A.Harvard-Smithsonian Center for Astrophysics (author)
  • Decin, L.Katholieke Universiteit Leuven,University of Leeds (author)
  • Richards, A. M. S.University of Manchester (author)
  • Beck, Elvire De,1985Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)elvire (author)
  • Baudry, A.Université de Bordeaux,University of Bordeaux (author)
  • Bolte, J.Katholieke Universiteit Leuven (author)
  • Cannon, E.Katholieke Universiteit Leuven (author)
  • De Ceuster, F.Katholieke Universiteit Leuven (author)
  • de Koter, A.Universiteit Van Amsterdam,University of Amsterdam,Katholieke Universiteit Leuven (author)
  • Etoka, S.University of Manchester (author)
  • Gobrecht, D.Katholieke Universiteit Leuven (author)
  • Gray, M.National Astronomical Research Institute of Thailand,University of Manchester (author)
  • Herpin, F.Université de Bordeaux,University of Bordeaux (author)
  • Homan, W.Katholieke Universiteit Leuven,Université libre de Bruxelles (ULB) (author)
  • Jeste, M.Max-Planck Institut für Radioastronomie,Max-Planck Institute for Radio Astronomy (author)
  • Kervella, P.Observatoire de Paris,Paris Observatory (author)
  • Khouri, Theo,1985Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)theok (author)
  • Lagadec, E.Université Côte d'Azur,University of Côte d'Azur (author)
  • Maes, S.Katholieke Universiteit Leuven (author)
  • Malfait, J.Katholieke Universiteit Leuven (author)
  • McDonald, I.Open University,University of Manchester (author)
  • Menten, K. M.Max-Planck Institut für Radioastronomie,Max-Planck Institute for Radio Astronomy (author)
  • Montarges, M. (author)
  • Mueller, H. S. P.Universität zu Köln,University of Cologne (author)
  • Pimpanuwat, B.National Astronomical Research Institute of Thailand,University of Manchester (author)
  • Sahai, R.California Institute of Technology (Caltech) (author)
  • Wallstroem, S. H. J.Katholieke Universiteit Leuven (author)
  • Waters, L. B. F. M.Netherlands Institute for Space Research (SRON),Radboud Universiteit,Radboud University (author)
  • Wong, K. T.Institut de Radioastronomie Millimétrique (IRAM) (author)
  • Yates, J.University College London (UCL) (author)
  • Zijlstra, A.University of Manchester,The University of Hong Kong (author)
  • Katholieke Universiteit LeuvenUniversity of Leeds (creator_code:org_t)

Related titles

  • In:Astronomy and Astrophysics: EDP Sciences6550004-63611432-0746

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