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Rings and filaments :
Rings and filaments : The remarkable detached CO shell of U Antliae
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- Kerschbaum, F. (författare)
- Univ Vienna, Dept Astrophys,Universität Wien,University of Vienna
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- Maercker, Matthias, 1979 (författare)
- Chalmers Univ Technol, Dept Earth & Space Sci, Onsala Space Observ,Chalmers tekniska högskola,Chalmers University of Technology,Universität Wien,University of Vienna,Royal Observatory of Belgium,European Southern Observatory (ESO),Univ Vienna, Dept Astrophys,Koninklijke Sterrenwacht van Belgie,European Southern Observ, Karl Schwarzschild Str 2
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- Brunner, M. (författare)
- Univ Vienna, Dept Astrophys
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- Lindqvist, Michael, 1960 (författare)
- Chalmers Univ Technol, Dept Earth & Space Sci, Onsala Space Observ,Chalmers tekniska högskola,Chalmers University of Technology
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- Olofsson, Hans, 1952 (författare)
- Chalmers Univ Technol, Dept Earth & Space Sci, Onsala Space Observ,Chalmers tekniska högskola,Chalmers University of Technology
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- Mecina, M. (författare)
- Univ Vienna, Dept Astrophys
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- De Beck, Elvire, 1985 (författare)
- Chalmers Univ Technol, Dept Earth & Space Sci, Onsala Space Observ,Chalmers tekniska högskola,Chalmers University of Technology
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- Groenewegen, M. A. T. (författare)
- Koninklijke Sterrenwacht van Belgie
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- Lagadec, E. (författare)
- Univ Cote Azur, Observ Cote Azur, Lab Lagrange, CNRS,Bd Observ,Observatoire de la Cote d'Azur
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- Mohamed, S. (författare)
- South African Astron Observ.; Univ Cape Town, Dept Astron.; Natl Inst Theoret Phys, Private Bag X1,National Institute for Theoretical Physics,South African Astronomical Observatory,University of Cape Town
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- Paladini, C. (författare)
- Univ Libre Bruxelles, Inst Astron & Astrophys, Campus Plaine CP 226,Université libre de Bruxelles (ULB)
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- Ramstedt, Sofia (författare)
- Uppsala universitet,Teoretisk astrofysik,Uppsala University
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- Vlemmings, Wouter, 1974 (författare)
- Chalmers Univ Technol, Dept Earth & Space Sci, Onsala Space Observ,Chalmers tekniska högskola,Chalmers University of Technology
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- Wittkowski, M. (författare)
- European Southern Observ, Karl Schwarzschild Str 2
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(creator_code:org_t)
- 2017-09-20
- 2017
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 605
- Relaterad länk:
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https://www.aanda.or...
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http://publications.... (primary) (free)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Aims. Our goal is to characterize the intermediate age, detached shell carbon star U Antliae morphologically and physically in order to study the mass-loss evolution after a possible thermal pulse.Methods. High spatial resolution ALMA observations of unprecedented quality in thermal CO lines allow us to derive first critical spatial and temporal scales and constrain modeling efforts to estimate mass-loss rates for both the present day as well as the ejection period of the detached shell.Results. The detached shell is remarkably thin, overall spherically symmetric, and shows a barely resolved filamentary substructure possibly caused by instabilities in the interaction zone of winds with different outflow velocities. The expansion age of the detached shell is of the order of 2700 yr and its overall width indicates a high expansion-velocity and high mass-loss period of only a few hundred years at an average mass-loss rate of approximate to 10(-5) M-circle dot yr(-1). The post-high-mass-loss-rate-epoch evolution of U Ant shows a significant decline to a substantially lower gas expansion velocity and a mass-loss rate amounting to 4 x 10(-8) M-circle dot yr(-1), at present being consistent with evolutionary changes as predicted for the period between thermal pulses.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- stars: AGB and post-AGB
- stars: carbon
- stars: evolution
- stars: mass-loss
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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Till lärosätets databas
- Av författaren/redakt...
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Kerschbaum, F.
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Maercker, Matthi ...
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Brunner, M.
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Lindqvist, Micha ...
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Olofsson, Hans, ...
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Mecina, M.
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De Beck, Elvire, ...
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Groenewegen, M. ...
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Lagadec, E.
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Mohamed, S.
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Paladini, C.
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Ramstedt, Sofia
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Vlemmings, Woute ...
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Wittkowski, M.
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Uppsala universitet
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Chalmers tekniska högskola