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Herschel/HIFI obser...
Herschel/HIFI observations of high-J CO transitions in the protoplanetary nebula CRL 618
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Bujarrabal, V. (författare)
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Alcolea, J. (författare)
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Soria-Ruiz, R. (författare)
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- Planesas, P. (författare)
- Atacama Large Millimeter-submillimeter Array (ALMA),European Space Astronomy Centre (ESAC)
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- Teyssier, D. (författare)
- European Space Astronomy Centre (ESAC)
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- Marston, A. P. (författare)
- European Space Astronomy Centre (ESAC)
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- Cernicharo, J. (författare)
- Centro de Astrobiologia (CAB)
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- Decin, L. (författare)
- Katholieke Universiteit Leuven,Universiteit Van Amsterdam,University of Amsterdam
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- Dominik, C. (författare)
- Radboud Universiteit,Radboud University,Universiteit Van Amsterdam,University of Amsterdam
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- Justtanont, Kay, 1965 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- de Koter, A. (författare)
- Universiteit Van Amsterdam,University of Amsterdam
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- Melnick, G. J. (författare)
- Harvard-Smithsonian Center for Astrophysics
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- Menten, K. M. (författare)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Neufeld, D. A. (författare)
- Johns Hopkins University
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- Olofsson, Hans, 1952 (författare)
- Stockholms universitet,Institutionen för astronomi,Chalmers tekniska högskola,Chalmers University of Technology
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- Schmidt, M. (författare)
- Polish Academy of Sciences
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- Schöier, Fredrik, 1969 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Szczerba, R. (författare)
- Polish Academy of Sciences
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- Waters, Lbfm (författare)
- Universiteit Van Amsterdam,University of Amsterdam,Katholieke Universiteit Leuven
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- Quintana-Lacaci, G. (författare)
- Institut de Radioastronomie Millimétrique (IRAM)
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- Güsten, R. (författare)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Gallego, J. D. (författare)
- Observatorio de Yebes (IGN),Yebes Observatory
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- Diez-Gonzalez, M. C. (författare)
- Observatorio de Yebes (IGN),Yebes Observatory
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- Barcia, A. (författare)
- Observatorio de Yebes (IGN),Yebes Observatory
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- Lopez-Fernandez, I. (författare)
- Observatorio de Yebes (IGN),Yebes Observatory
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- Wildeman, K. (författare)
- Netherlands Institute for Space Research (SRON)
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- Tielens, Aggm (författare)
- Universiteit Leiden (UL),Leiden University (UL)
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- Jacobs, K. (författare)
- Universität zu Köln,University of Cologne
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(creator_code:org_t)
- 2010-10-01
- 2010
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 521:1, s. Article Number: L3-
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Abstract
Ämnesord
Stäng
- Aims. We aim to study the physical conditions, particularly the excitation state, of the intermediate-temperature gas components in the protoplanetary nebula CRL 618. These components are particularly important for understanding the evolution of the nebula. Methods. We performed Herschel/HIFI observations of several CO lines in the far-infrared/sub-mm in the protoplanetary nebula CRL 618. The high spectral resolution provided by HIFI allows measurement of the line profiles. Since the dynamics and structure of the nebula is well known from mm-wave interferometric maps, it is possible to identify the contributions of the different nebular components (fast bipolar outflows, double shells, compact slow shell) to the line profiles. The observation of these relatively high-energy transitions allows an accurate study of the excitation conditions in these components, particularly in the warm ones, which cannot be properly studied from the low-energy lines. Results. The (CO)-C-12 J = 16-15, 10-9, and 6-5 lines are easily detected in this source. Both (CO)-C-13 J = 10-9 and 6-5 are also detected. Wide profiles showing spectacular line wings have been found, particularly in (CO)-C-12 J = 16-15. Other lines observed simultaneously with CO are also shown. Our analysis of the CO high-J transitions, when compared with the existing models, confirms the very low expansion velocity of the central, dense component, which probably indicates that the shells ejected during the last AGB phases were driven by radiation pressure under a regime of maximum transfer of momentum. No contribution of the diffuse halo found from mm-wave data is identified in our spectra, because of its low temperature. We find that the fast bipolar outflow is quite hot, much hotter than previously estimated; for instance, gas flowing at 100 km s(-1) must have a temperature higher than similar to 200 K. Probably, this very fast outflow, with a kinematic age
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- planetary nebulae: general
- heterodyne instrument
- apex
- crl-618
- circumstellar matter
- planetary nebulae: individual: CRL 618
- dynamics
- facility
- stars: AGB and post-AGB
- molecular envelope
- stars: mass-loss
- Astronomy and astrophysics
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- art (ämneskategori)
- ref (ämneskategori)
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Till lärosätets databas
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Bujarrabal, V.
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Alcolea, J.
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Soria-Ruiz, R.
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Planesas, P.
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Teyssier, D.
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Marston, A. P.
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visa fler...
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Cernicharo, J.
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Decin, L.
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Dominik, C.
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Justtanont, Kay, ...
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de Koter, A.
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Melnick, G. J.
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Menten, K. M.
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Neufeld, D. A.
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Olofsson, Hans, ...
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Schmidt, M.
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Schöier, Fredrik ...
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Szczerba, R.
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Waters, Lbfm
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Quintana-Lacaci, ...
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Güsten, R.
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Gallego, J. D.
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Diez-Gonzalez, M ...
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Barcia, A.
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Lopez-Fernandez, ...
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Wildeman, K.
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Tielens, Aggm
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Jacobs, K.
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