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Molecular line stud...
Molecular line study of the S-type AGB star W Aquilae: ALMA observations of CS, SiS, SiO and HCN
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- Brunner, M. (författare)
- Universität Wien,University of Vienna,Univ Vienna, Dept Astrophys, Turkenschanzstr 17, A-1180 Vienna, Austria
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- Danilovich, Taissa, 1987 (författare)
- Katholieke Universiteit Leuven,Chalmers tekniska högskola,Chalmers University of Technology,Chalmers Univ Technol, Onsala Space Observ, Dept Space Earth & Environm, S-43992 Onsala, Sweden;Katholieke Univ Leuven, Dept Phys & Astron, Inst Astron, Celestijnenlaan 200D, B-3001 Leuven, Belgium
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- Ramstedt, Sofia (författare)
- Uppsala universitet,Teoretisk astrofysik
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- Marti-Vidal, Ivan, 1980 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology,Chalmers Univ Technol, Onsala Space Observ, Dept Space Earth & Environm, S-43992 Onsala, Sweden
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- De Beck, Elvire, 1985 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology,Chalmers Univ Technol, Onsala Space Observ, Dept Space Earth & Environm, S-43992 Onsala, Sweden
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- Vlemmings, Wouter, 1974 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology,Chalmers Univ Technol, Onsala Space Observ, Dept Space Earth & Environm, S-43992 Onsala, Sweden
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- Lindqvist, Michael, 1960 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology,Chalmers Univ Technol, Onsala Space Observ, Dept Space Earth & Environm, S-43992 Onsala, Sweden
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- Kerschbaum, F. (författare)
- Universität Wien,University of Vienna,Univ Vienna, Dept Astrophys, Turkenschanzstr 17, A-1180 Vienna, Austria
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(creator_code:org_t)
- 2018-09-14
- 2018
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 617
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Context. With the outstanding spatial resolution and sensitivity of the Atacama Large Millimeter/sub-millimeter Array (ALMA), molecular gas other than the abundant CO can be observed and resolved in circumstellar envelopes (CSEs) around evolved stars, such as the binary S-type asymptotic giant branch (AGB) star W Aquilae. Aims. We aim to constrain the chemical composition of the CSE and determine the radial abundance distribution, the photospheric peak abundance, and isotopic ratios of a selection of chemically important molecular species in the innermost CSE of W Aql. The derived parameters are put into the context of the chemical evolution of AGB stars and are compared with theoretical models. Methods . We employ one-dimensional radiative transfer modeling - with the accelerated lambda iteration (ALI) radiative transfer code-of the radial abundance distribution of a total of five molecular species (CS, SiS, (SiS)-Si-30, (SiO)-Si-29 and (HCN)-C-13) and determine the best fitting model parameters based on high-resolution ALMA observations as well as archival single-dish observations. The additional advantage of the spatially resolved ALMA observations is that we can directly constrain the radial profile of the observed line transitions from the observations. Results . We derive abundances and e-folding radii for CS, SiS, (SiS)-Si-30, (SiO)-Si-29 and (HCN)-C-13 and compare them to previous studies, which are based only on unresolved single-dish spectra. Our results are in line with previous results and are more accurate due to resolution of the emission regions.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
Nyckelord
- stars: winds, outflows
- circumstellar matter
- submillimeter: stars
- stars: abundances
- stars: AGB and post-AGB
- stars: mass-loss
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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