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ALMA sub-mm maser a...
ALMA sub-mm maser and dust distribution of VY Canis Majoris
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- Richards, A. M. S. (author)
- University of Manchester
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- Impellizzeri, C. M. V. (author)
- Atacama Large Millimeter-submillimeter Array (ALMA),National Radio Astronomy Observatory
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- Humphreys, E. M. (author)
- European Southern Observatory (ESO)
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- Vlahakis, C. (author)
- Atacama Large Millimeter-submillimeter Array (ALMA)
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- Vlemmings, Wouter, 1974 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Baudry, A. (author)
- Laboratoire d'Astrophysique de Bordeaux,Centre national de la recherche scientifique (CNRS)
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- De Beck, Elvire, 1985 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Decin, L. (author)
- Katholieke Universiteit Leuven
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- Etoka, S. (author)
- Universität Hamburg,University of Hamburg
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- Gray, M. D. (author)
- University of Manchester
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- Harper, G. M. (author)
- Trinity College Dublin, the University of Dublin
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- Hunter, T. R. (author)
- National Radio Astronomy Observatory
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- Kervella, P. (author)
- Paris Diderot University, France,Universidad de Chile (UCH),University of Chile (UCH)
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- Kerschbaum, F. (author)
- Universität Wien,University of Vienna
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- McDonald, I. (author)
- University of Manchester
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- Melnick, G. J. (author)
- Harvard-Smithsonian Center for Astrophysics
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- Muller, Sebastien, 1976 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Neufeld, D. A. (author)
- Johns Hopkins University
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- O Gorman, Eamon, 1984 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Parfenov, S. Y. (author)
- Ural Federal University
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- Peck, A. B. (author)
- National Radio Astronomy Observatory
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- Shinnaga, H. (author)
- National Astronomical Observatory of Japan
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- Sobolev, A. M. (author)
- Ural Federal University
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- Testi, L. (author)
- European Southern Observatory (ESO)
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- Uscanga, L. (author)
- National Observatory of Athens
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- Wootten, A. (author)
- National Radio Astronomy Observatory
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- Yates, J. A. (author)
- University College London (UCL)
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- Zijlstra, A. (author)
- University of Manchester
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(creator_code:org_t)
- 2014-12-03
- 2014
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 572
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Abstract
Subject headings
Close
- Aims. Cool, evolved stars have copious, enriched winds. Observations have so far not fully constrained models for the shaping and acceleration of these winds. We need to understand the dynamics better, from the pulsating stellar surface to similar to 10 stellar radii, where radiation pressure on dust is fully effective. Asymmetric nebulae around some red supergiants imply the action of additional forces. Methods. We retrieved ALMA Science Verification data providing images of sub-mm line and continuum emission from VY CMa. This enables us to locate water masers with milli-arcsec accuracy and to resolve the dusty continuum. Results. The 658, 321, and 325 GHz masers lie in irregular, thick shells at increasing distances from the centre of expansion. For the first time this is confirmed as the stellar position, coinciding with a compact peak offset to the NW of the brightest continuum emission. The maser shells overlap but avoid each other on scales of up to 10 au. Their distribution is broadly consistent with excitation models but the conditions and kinematics are complicated by wind collisions, clumping, and asymmetries.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- stars: mass-loss
- stars: individual: VY CMa
- supergiants
- masers
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Richards, A. M. ...
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Impellizzeri, C. ...
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Humphreys, E. M.
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Vlahakis, C.
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Vlemmings, Woute ...
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Baudry, A.
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show more...
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De Beck, Elvire, ...
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Decin, L.
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Etoka, S.
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Gray, M. D.
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Harper, G. M.
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Hunter, T. R.
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Kervella, P.
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Kerschbaum, F.
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McDonald, I.
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Melnick, G. J.
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Muller, Sebastie ...
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Neufeld, D. A.
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O Gorman, Eamon, ...
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Parfenov, S. Y.
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Peck, A. B.
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Shinnaga, H.
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Sobolev, A. M.
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Testi, L.
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Uscanga, L.
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Wootten, A.
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Yates, J. A.
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Zijlstra, A.
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- NATURAL SCIENCES
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Chalmers University of Technology