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Dissecting the AGB ...
Dissecting the AGB star L-2 Puppis : a torus in the making
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- Lykou, F. (författare)
- Univ Vienna, Inst Astrophys, A-1180 Vienna, Austria,Universität Wien,University of Vienna
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- Klotz, D. (författare)
- Univ Vienna, Inst Astrophys, A-1180 Vienna, Austria,Universität Wien,University of Vienna
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- Paladini, C. (författare)
- Univ Vienna, Inst Astrophys, A-1180 Vienna, Austria; Univ Libre Bruxelles, Inst Astron & Astrophys, B-1050 Brussels, Belgium,Université libre de Bruxelles (ULB),Universität Wien,University of Vienna
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- Hron, J. (författare)
- Univ Vienna, Inst Astrophys, A-1180 Vienna, Austria,Universität Wien,University of Vienna
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- Zijlstra, A. A. (författare)
- Univ Manchester, Jodrell Bank, Ctr Astrophys, Manchester M13 9PL, Lancs, England,University of Manchester
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- Kluska, J. (författare)
- UJF Grenoble 1, CNRS INSU, IPAG, UMR Grenoble 5274, Grenoble, France,Centre national de la recherche scientifique (CNRS)
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- Maercker, Matthias, 1979 (författare)
- Univ Sydney, Sydney Inst Astron, Sydney, NSW 2016, Australia,The University of Sydney,Chalmers tekniska högskola,Chalmers University of Technology,European So Observ, D-85748 Garching, Germany,Chalmers, Onsala Space Observ, Dept Earth & Space Sci, S-43992 Onsala, Sweden
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- Tuthill, P. G. (författare)
- Univ Sydney, Sydney Inst Astron, Sydney, NSW 2016, Australia,The University of Sydney
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- Ramstedt, Sofia (författare)
- Uppsala universitet,Teoretisk astrofysik,Uppsala University
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- Lagadec, E. (författare)
- Cornell Univ, Dept Astron, Ithaca, NY 14853 USA; Univ Nice Sophia Antipolis, CNRS, Observ Cote Azur, Lab Lagrange,UMR 7293, F-06304 Nice 4, France,Cornell University,Université Nice Sophia Antipolis (UNS)
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- Wittkowski, M. (författare)
- European So Observ, D-85748 Garching, Germany,European Southern Observatory (ESO)
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- Maercker, M. (författare)
- Chalmers, Onsala Space Observ, Dept Earth & Space Sci, S-43992 Onsala, Sweden
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- Mayer, A. (författare)
- Univ Vienna, Inst Astrophys, A-1180 Vienna, Austria,Universität Wien,University of Vienna
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(creator_code:org_t)
- 2015-03-26
- 2015
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 576
- 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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https://research.cha...
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Abstract
Ämnesord
Stäng
- Aims. The circumstellar environment of L-2 Pup, an oxygen-rich semiregular variable, was observed to understand the evolution of mass loss and the shaping of ejecta in the late stages of stellar evolution. Methods. High-angular resolution observations from a single 8 m telescope were obtained using aperture masking in the near-infrared (1.64, 2.30 and 3.74 mu m) on the NACO/VLT, both in imaging and polarimetric modes. Results. The aperture-masking images of L-2 Pup at 2.30 mu m show a resolved structure that resembles a toroidal structure with a major axis of similar to 140 milliarcseconds (mas) and an east-west orientation. Two clumps can be seen on either side of the star, similar to 65 mas from the star, beyond the edge of the circumstellar envelope (estimated diameter is similar to 27 mas), while a faint, hook-like structure appear toward the northeast. The patterns are visible both in the imaging and polarimetric mode, although the latter was only used to measure the total intensity (Stokes I). The overall shape of the structure is similar at the 3.74 mu m pseudo-continuum (dust emission), where the clumps appear to be embedded within a dark, dusty lane. The faint, hook-like patterns are also seen at this wavelength, extending northeast and southwest with the central, dark lane being an apparent axis of symmetry. We interpret the structure as a circumstellar torus with inner radius of 4.2 au. With a rotation velocity of 10 kms(-1) as suggested by the SiO maser profile, we estimate a stellar mass of 0.7 M-circle dot.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- techniques: high angular resolution
- methods: observational
- stars: AGB and post-AGB
- circumstellar matter
- stars: evolution
- stars: individual: L-2 Puppis
Publikations- och innehållstyp
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- art (ämneskategori)
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Till lärosätets databas
- Av författaren/redakt...
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Lykou, F.
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Klotz, D.
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Paladini, C.
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Hron, J.
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Zijlstra, A. A.
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Kluska, J.
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visa fler...
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Maercker, Matthi ...
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Tuthill, P. G.
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Ramstedt, Sofia
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Lagadec, E.
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Wittkowski, M.
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Maercker, M.
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Mayer, A.
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Uppsala universitet
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Chalmers tekniska högskola