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ALMA observations o...
ALMA observations of the vibrationally excited rotational CO transition v=1, J=3-2 towards five AGB stars
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- Khouri, Theo, 1985 (författare)
- Chalmers, Onsala Space Observ, Dept Earth & Space Sci, SE-43992 Onsala, Sweden.,Chalmers tekniska högskola,Chalmers University of Technology
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- Vlemmings, Wouter, 1974 (författare)
- Chalmers, Onsala Space Observ, Dept Earth & Space Sci, SE-43992 Onsala, Sweden.,Chalmers tekniska högskola,Chalmers University of Technology
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- Ramstedt, Sofia (författare)
- Uppsala universitet,Teoretisk astrofysik,Uppsala University
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- Lombaert, Robin, 1986 (författare)
- Chalmers, Onsala Space Observ, Dept Earth & Space Sci, SE-43992 Onsala, Sweden.,Chalmers tekniska högskola,Chalmers University of Technology
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- Maercker, Matthias, 1979 (författare)
- Chalmers, Onsala Space Observ, Dept Earth & Space Sci, SE-43992 Onsala, Sweden.,Chalmers tekniska högskola,Chalmers University of Technology
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- De Beck, Elvire, 1985 (författare)
- Chalmers, Onsala Space Observ, Dept Earth & Space Sci, SE-43992 Onsala, Sweden.,Chalmers tekniska högskola,Chalmers University of Technology
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Chalmers, Onsala Space Observ, Dept Earth & Space Sci, SE-43992 Onsala, Sweden Chalmers tekniska högskola (creator_code:org_t)
- 2016-08-12
- 2016
- Engelska.
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Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966 .- 1745-3925 .- 1745-3933. ; 463:1, s. L74-L78
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https://academic.oup...
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http://publications.... (primary) (free)
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Abstract
Ämnesord
Stäng
- We report the serendipitous detection with the Atacama Large Millimeter/submillimeter Array (ALMA) of the vibrationally excited pure-rotational CO transition, J = 3 - 2 towards five asymptotic giant branch (AGB) stars, Cet, R Aqr, R Scl, W Aql, and pi(1) Gru. The observed lines are formed in the poorly understood region located between the stellar surface and the region where the wind starts, the so-called warm molecular layer. We successfully reproduce the observed lines profiles using a simple model. We constrain the extents, densities, and kinematics of the region where the lines are produced. R Aqr and R Scl show inverse P-Cygni line profiles which indicate infall of material on to the stars. The line profiles of Cet and R Scl show variability. The serendipitous detection towards these five sources shows that vibrationally excited rotational lines can be observed towards a large number of nearby AGB stars using ALMA. This opens a new possibility for the study of the innermost regions of AGB circumstellar envelopes.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- line: profiles
- stars: AGB and post-AGB
- circumstellar matter
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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