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Rings and filaments :
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Kerschbaum, F.Univ Vienna, Dept Astrophys,Universität Wien,University of Vienna
(author)
Rings and filaments : The remarkable detached CO shell of U Antliae
- Article/chapterEnglish2017
Publisher, publication year, extent ...
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2017-09-20
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EDP Sciences,2017
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printrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:uu-337756
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-337756URI
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https://doi.org/10.1051/0004-6361/201730665DOI
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https://research.chalmers.se/publication/252968URI
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
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Acknowledgements: F.K. and M.B. acknowledge funding by the Austrian Science Fund FWF under project number P23586. M.B. further acknowledges funding through the uni: docs fellowship of the University of Vienna. M.M., H.O., and W.V. acknowledge financial support from the Swedish Research Council. C.P. is supported by the Belgian Fund for Scientific Research F.R.S.-FNRS.
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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.
Subject headings and genre
Added entries (persons, corporate bodies, meetings, titles ...)
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Maercker, Matthias,1979Chalmers 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(Swepub:cth)maercker
(author)
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Brunner, M.Univ Vienna, Dept Astrophys
(author)
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Lindqvist, Michael,1960Chalmers Univ Technol, Dept Earth & Space Sci, Onsala Space Observ,Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)mlq
(author)
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Olofsson, Hans,1952Chalmers Univ Technol, Dept Earth & Space Sci, Onsala Space Observ,Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)hanolo
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Mecina, M.Univ Vienna, Dept Astrophys
(author)
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De Beck, Elvire,1985Chalmers Univ Technol, Dept Earth & Space Sci, Onsala Space Observ,Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)elvire
(author)
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Groenewegen, M. A. T.Koninklijke Sterrenwacht van Belgie
(author)
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Lagadec, E.Univ Cote Azur, Observ Cote Azur, Lab Lagrange, CNRS,Bd Observ,Observatoire de la Cote d'Azur
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Mohamed, S.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
(author)
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Paladini, C.Univ Libre Bruxelles, Inst Astron & Astrophys, Campus Plaine CP 226,Université libre de Bruxelles (ULB)
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Ramstedt, SofiaUppsala universitet,Teoretisk astrofysik,Uppsala University(Swepub:uu)sofra336
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Vlemmings, Wouter,1974Chalmers Univ Technol, Dept Earth & Space Sci, Onsala Space Observ,Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)wouterv
(author)
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Wittkowski, M.European Southern Observ, Karl Schwarzschild Str 2
(author)
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Univ Vienna, Dept AstrophysUniversität Wien
(creator_code:org_t)
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In:Astronomy and Astrophysics: EDP Sciences6050004-63611432-0746
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