Sökning: onr:"swepub:oai:research.chalmers.se:038f06f0-0003-4012-af09-357b51e26184" >
ALMA observations o...
ALMA observations of the "fresh" carbon-rich AGB star TX Piscium The discovery of an elliptical detached shell
-
- Brunner, M. (författare)
- Universität Wien,University of Vienna
-
- Mecina, M. (författare)
- Universität Wien,University of Vienna
-
- Maercker, Matthias, 1979 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
-
visa fler...
-
- Dorfi, E. A. (författare)
- Universität Wien,University of Vienna
-
- Kerschbaum, F. (författare)
- Universität Wien,University of Vienna
-
- Olofsson, Hans, 1952 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
-
- Rau, G. (författare)
- Catholic University of America,NASA Goddard Space Flight Center
-
visa färre...
-
(creator_code:org_t)
- 2019-01-07
- 2019
- Engelska.
-
Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 621
- Relaterad länk:
-
https://research.cha... (primary) (free)
-
visa fler...
-
https://www.aanda.or...
-
https://research.cha...
-
https://research.cha...
-
https://doi.org/10.1...
-
visa färre...
Abstract
Ämnesord
Stäng
- Aims. The carbon-rich asymptotic giant branch (AGB) star TX Piscium (TX Psc) has been observed multiple times during multiple epochs and at different wavelengths and resolutions, showing a complex molecular CO line profile and a ring-like structure in thermal dust emission. We investigate the molecular counterpart in high resolution, aiming to resolve the ring-like structure and identify its origin. Methods. Atacama Large Millimeter/submillimeter Array (ALMA) observations have been carried out to map the circumstellar envelope (CSE) of TX Psc in CO(2-1) emission and investigate the counterpart to the ring-like dust structure. Results. We report the detection of a thin, irregular, and elliptical detached molecular shell around TX Psc, which coincides with the dust emission. This is the first discovery of a non-spherically symmetric detached shell, raising questions about the shaping of detached shells. Conclusions. We investigate possible shaping mechanisms for elliptical detached shells and find that in the case of TX Psc, stellar rotation of 2 km s(-1) can lead to a non-uniform mass-loss rate and velocity distribution from stellar pole to equator, recreating the elliptical CSE. We discuss the possible scenarios for increased stellar momentum, enabling the rotation rates needed to reproduce the ellipticity of our observations, and come to the conclusion that momentum transfer of an orbiting object with the mass of a brown dwarf would be sufficient.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Nyckelord
- stars: mass-loss
- stars: AGB and post-AGB
- stars: late-type
- stars: carbon
- stars: evolution
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
Hitta via bibliotek
Till lärosätets databas