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The geometry of the...
The geometry of the close environment of SV Piscium as probed by VLTI/MIDI
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- Klotz, D. (author)
- Universität Wien,University of Vienna
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- Sacuto, Stéphane (author)
- Uppsala universitet,Teoretisk astrofysik
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- Kerschbaum, F. (author)
- Universität Wien,University of Vienna
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- Paladini, C. (author)
- Universität Wien,University of Vienna
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- Olofsson, Hans, 1952 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Hron, J. (author)
- Universität Wien,University of Vienna
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(creator_code:org_t)
- 2012-05-23
- 2012
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 541
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Abstract
Subject headings
Close
- Context. SVPsc is an asymptotic giant branch (AGB) star surrounded by an oxygen-rich dust envelope. The mm-CO line profile of the object's outflow shows a clear double-component structure. Because of the high angular resolution, mid-IR interferometry may give strong constraints on the origin of this composite profile. Aims. The aim of this work is to investigate the morphology of the environment around SVPsc using high-angular resolution interferometry observations in the mid-IR with the Very Large Telescope MID-infrared Interferometric instrument (VLTI/MIDI). Methods. Interferometric data in the N-band taken at different baseline lengths (ranging from 32-64 m) and position angles (73-142 degrees) allow a study of the morphology of the circumstellar environment close to the star. The data are interpreted on the basis of 2-dimensional, chromatic geometrical models using the fitting software tool GEM-FIND developed for this purpose. Results. The results favor two scenarios: (i) the presence of a highly inclined, optically thin, dusty disk surrounding the central star; (ii) the presence of an unresolved binary companion at a separation of 13.7(-4.8)(+4.2) AU and a position angle of 121.8 degrees(-24.5)degrees(+15.4)degrees. NE. The derived orbital period of the binary is 38.1(-22.6)(+20.4) yr. This detection is in good agreement with hydrodynamic simulations showing that a close companion could be responsible for the entrainment of the gas and dust into a circumbinary structure.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- x-herculis
- techniques: interferometric
- mass-loss rates
- circumstellar
- giant branch stars
- velocity agb stars
- stars: AGB and post-AGB
- catalog
- emission
- bootis
- rv
- infrared
- stars: atmospheres
- dust
- variables
- stars: mass-loss
Publication and Content Type
- art (subject category)
- ref (subject category)
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