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ATOMIUM: Probing th...
ATOMIUM: Probing the inner wind of evolved O-rich stars with new, highly excited H2O and OH lines
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- Baudry, A. (författare)
- Laboratoire d'Astrophysique de Bordeaux,Univ Bordeaux, Lab Astrophys Bordeaux, CNRS, B18N allee Geoffroy St Hilaire, F-33615 Pessac, France.
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- Khouri, Theo, 1985 (författare)
- Uppsala universitet,Institutionen för fysik och astronomi,Inst Radioastron Millimetr, 300 rue Piscine, F-38406 St Martin Dheres, France.,Chalmers Univ Technol, Onsala Space Observ, S-43992 Onsala, Sweden.
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- Etoka, S. (författare)
- University of Manchester,Univ Manchester, Jodrell Bank Ctr Astrophys, Manchester M13 9PL, England.
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- Richards, A. M. S. (författare)
- University of Manchester,LESIA - Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique,Univ Manchester, Jodrell Bank Ctr Astrophys, Manchester M13 9PL, England.,Univ Paris 05, LESIA, Observ Paris, CNRS, 5 Pl Jules Janssen, F-92195 Meudon, France.
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- Mueller, H. S. P. (författare)
- Universität zu Köln,University of Cologne,Univ Cologne, Phys Inst 1, D-50937 Cologne, Germany.
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- Herpin, F. (författare)
- Laboratoire d'Astrophysique de Bordeaux,Univ Bordeaux, Lab Astrophys Bordeaux, CNRS, B18N allee Geoffroy St Hilaire, F-33615 Pessac, France.
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- Danilovich, Taissa, 1987 (författare)
- Katholieke Universiteit Leuven,Monash University,Katholieke Univ Leuven, Inst Astron, Celestijnenlaan 200D, B-3001 Leuven, Belgium.;Monash Univ, Sch Phys & Astron, Wellington Rd, Clayton, Vic 3800, Australia.
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- Gray, M. D. (författare)
- University of Manchester,Univ Manchester, Jodrell Bank Ctr Astrophys, Manchester M13 9PL, England.;Natl Astron Res Inst Thailand, 260 Moo 4, Chiangmai 50180, Thailand.
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- Wallström, Sofia, 1988 (författare)
- Katholieke Universiteit Leuven,Katholieke Univ Leuven, Inst Astron, Celestijnenlaan 200D, B-3001 Leuven, Belgium.
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- Gobrecht, David (författare)
- Gothenburg University,Göteborgs universitet,Institutionen för kemi och molekylärbiologi,Department of Chemistry and Molecular Biology,University of Gothenburg,Katholieke Universiteit Leuven,Katholieke Univ Leuven, Inst Astron, Celestijnenlaan 200D, B-3001 Leuven, Belgium.;Univ Gothenburg, Dept Chem & Mol Biol, S-40530 Gothenburg, Sweden.
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Khouri, T. (författare)
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- Decin, L. (författare)
- Katholieke Universiteit Leuven,Katholieke Univ Leuven, Inst Astron, Celestijnenlaan 200D, B-3001 Leuven, Belgium.
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- Gottlieb, C. A. (författare)
- Harvard-Smithsonian Center for Astrophysics,Harvard Smithsonian Ctr Astrophys, Cambride, MA 02138 USA.
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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),Max Planck Inst Radioastron, D-53121 Bonn, Germany.
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- Homan, W. (författare)
- Katholieke Universiteit Leuven,Katholieke Univ Leuven, Inst Astron, Celestijnenlaan 200D, B-3001 Leuven, Belgium.
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- Millar, T. J. (författare)
- Queen's University Belfast,Queens Univ Belfast, Astrophys Res Ctr, Sch Math & Phys, Univ Rd, Belfast BT7 1NN, North Ireland.
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- Montarges, M. (författare)
- University of Leeds,Univ Leeds, Sch Chem, Leeds LS2 9JT, England.
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- Pimpanuwat, B. (författare)
- University of Manchester,Univ Manchester, Jodrell Bank Ctr Astrophys, Manchester M13 9PL, England.
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Plane, J. M. C. (författare)
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- Kervella, P. (författare)
- LESIA - Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique,Univ Paris 05, LESIA, Observ Paris, CNRS, 5 Pl Jules Janssen, F-92195 Meudon, France.
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Laboratoire d'Astrophysique de Bordeaux Univ Bordeaux, Lab Astrophys Bordeaux, CNRS, B18N allee Geoffroy St Hilaire, F-33615 Pessac, France (creator_code:org_t)
- EDP Sciences, 2023
- 2023
- Engelska.
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Ingår i: Astronomy & Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 674
- Relaterad länk:
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https://research.cha... (primary) (free)
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https://uu.diva-port... (primary) (Raw object)
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- Context. Water (H2O) and the hydroxyl radical (OH) are major constituents of the envelope of O-rich late-type stars. Transitions involving energy levels that are rotationally or vibrationally highly excited (energies & GSIM;4000 K) have been observed in both H2O and OH. These and more recently discovered transitions can now be observed at a high sensitivity and angular resolution in the inner wind close to the stellar photosphere with the Atacama Large Millimeter/submillimeter Array (ALMA). Aims. Our goals are: (1) to identify and map the emission and absorption of H2O in several vibrational states, and of OH in Lambda-doubling transitions with similar excitation energies; and (2) to determine the physical conditions and kinematics in gas layers close to the extended atmosphere in a sample of asymptotic giant branch stars (AGBs) and red supergiants (RSGs). Methods. Spectra and maps of H2O and OH lines observed in a 27 GHz aggregated bandwidth and with an angular resolution of similar to 0."02-1."0 were obtained at two epochs with the main ALMA array. Additional observations with the Atacama Compact Array (ACA) were used to check for time variability of water transitions. Radiative transfer models of H2O were revisited to characterize masing conditions. Up-to-date chemical models were used for comparison with the observed OH/H2O abundance ratio. Results. Ten rotational transitions of H2O with excitation energies similar to 4000-9000 K were observed in vibrational states up to (& upsilon;(1),& upsilon;(2),& upsilon;(3)) = (0,1,1). All but one are new detections in space, and from these we have derived accurate rest frequencies. Hyperfine split Lambda-doubling transitions in & upsilon; = 0, J = 27/2 and 29/2 levels of the (2)& pi;(3/2) state, as well as J = 33/2 and 35/2 of the (2)& pi;(1/2) state of OH with excitation energies of similar to 4780-8900 K were also observed. Four of these transitions are new detections in space. Combining our measurements with earlier observations of OH, the & upsilon; = 0 and & upsilon; = 1 Lambda-doubling frequencies have been improved. Our H2O maps show compact emission toward the central star and extensions up to twelve stellar radii or more. The 268.149 GHz emission line of water in the & upsilon;(2) = 2 state is time variable, tends to be masing with dominant radiative pumping, and is widely excited in AGBs and RSGs. The widespread but weaker 262.898 GHz water line in the & upsilon;(2) = 1 state also shows signs of maser emission. The OH emission is weak and quasithermally excited. Emission and absorption features of H2O and OH reveal an infall of matter and complex kinematics influenced by binarity. From the OH and H2O column densities derived with nonmasing transitions in a few sources, we obtain OH/H2O abundance ratios of similar to(0.7-2.8) x 10(-2).
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)
Nyckelord
- stars: AGB and post-AGB
- supergiants
- circumstellar matter
- line
- identification
- instrumentation: interferometers
- masers
- vy canis majoris
- nonlocal radiative-transfer
- sio maser emission
- giant
- branch stars
- water-vapor
- agb stars
- infrared-spectroscopy
- mira
- variables
- oxygen-rich
- circumstellar envelopes
- Astronomy & Astrophysics
- Supergiants
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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Till lärosätets databas
- Av författaren/redakt...
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Baudry, A.
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Khouri, Theo, 19 ...
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Etoka, S.
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Richards, A. M. ...
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Mueller, H. S. P ...
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Herpin, F.
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visa fler...
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Danilovich, Tais ...
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Gray, M. D.
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Wallström, Sofia ...
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Gobrecht, David
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Khouri, T.
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Decin, L.
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Gottlieb, C. A.
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Menten, K. M.
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Homan, W.
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Millar, T. J.
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Montarges, M.
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Pimpanuwat, B.
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Plane, J. M. C.
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Kervella, P.
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- Om ämnet
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- NATURVETENSKAP
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NATURVETENSKAP
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och Fysik
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och Astronomi astrof ...
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- NATURVETENSKAP
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NATURVETENSKAP
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och Fysik
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Astronomy & Astr ...
- Av lärosätet
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Göteborgs universitet
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Chalmers tekniska högskola
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Uppsala universitet