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The Widespread Occu...
The Widespread Occurrence of Water Vapor in the Circumstellar Envelopes of Carbon-Rich Asymptotic Giant Branch Stars: First Results From a Survey With Herschel/HIFI
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- Neufeld, D. A. (författare)
- Johns Hopkins University
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- Gonzalez-Alfonso, E. (författare)
- Universidad de Alcala,University of Alcalá
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- Melnick, G. J. (författare)
- Harvard-Smithsonian Center for Astrophysics
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- Szczerba, R. (författare)
- Polish Academy of Sciences
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- Schmidt, M. (författare)
- Polish Academy of Sciences
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- Decin, L. (författare)
- Katholieke Universiteit Leuven,Universiteit Van Amsterdam,University of Amsterdam
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- Alcolea, J. (författare)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- de Koter, A. (författare)
- Universiteit Van Amsterdam,University of Amsterdam
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- Schöier, Fredrik, 1969 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Bujarrabal, V. (författare)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- Cernicharo, J. (författare)
- Centro de Astrobiologia (CAB)
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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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- Marston, A. P. (författare)
- European Space Astronomy Centre (ESAC),Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN),Atacama Large Millimeter-submillimeter Array (ALMA)
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- Menten, K. (författare)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Olofsson, Hans, 1952 (författare)
- Stockholms universitet,Institutionen för astronomi,Chalmers tekniska högskola,Chalmers University of Technology
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- Planesas, P. (författare)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN),Atacama Large Millimeter-submillimeter Array (ALMA)
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- Teyssier, D. (författare)
- Centro de Astrobiologia (CAB)
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- Waters, Lbfm (författare)
- Netherlands Institute for Space Research (SRON),Universiteit Van Amsterdam,University of Amsterdam
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(creator_code:org_t)
- 2011
- 2011
- Engelska.
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Ingår i: Astrophysical Journal Letters. - 2041-8213 .- 2041-8205. ; 727:2
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Abstract
Ämnesord
Stäng
- We report the preliminary results of a survey for water vapor in a sample of eight C stars with large mid-IR continuum fluxes: V384 Per, CIT 6, V Hya, Y CVn, IRAS 15194-5115, V Cyg, S Cep, and IRC+40540. This survey, performed using the HIFI instrument on board the Herschel Space Observatory, entailed observations of the lowest transitions of both ortho-and para-water: the 556.936 GHz 1(10)-1(01) and 1113.343 GHz 1(11)-0(00) transitions, respectively. Water vapor was unequivocally detected in all eight of the target stars. Prior to this survey, IRC+10216 was the only carbon-rich asymptotic giant branch (AGB) star from which thermal water emissions had been discovered, in that case with the use of the Submillimeter Wave Astronomy Satellite (SWAS). Our results indicate that IRC+10216 is not unusual, except insofar as its proximity to Earth leads to a large line flux that was detectable with SWAS. The water spectral line widths are typically similar to those of CO rotational lines, arguing against the vaporization of a Kuiper Belt analog being the general explanation for water vapor in carbon-rich AGB stars. There is no apparent correlation between the ratio of the integrated water line fluxes to the 6.3 mu m continuum flux-a ratio which measures the water outflow rate-and the total mass-loss rate for the stars in our sample.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- outflow
- winds
- submillimeter: stars
- spectra
- mass-loss rates
- v-hydrae
- irc+10216
- emission
- chemistry
- stars: abundances
- lines
- stars: AGB and post-AGB
- discovery
- circumstellar matter
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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- Av författaren/redakt...
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Neufeld, D. A.
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Gonzalez-Alfonso ...
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Melnick, G. J.
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Szczerba, R.
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Schmidt, M.
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Decin, L.
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visa fler...
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Alcolea, J.
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de Koter, A.
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Schöier, Fredrik ...
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Bujarrabal, V.
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Cernicharo, J.
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Dominik, C.
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Justtanont, Kay, ...
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Marston, A. P.
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Menten, K.
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Olofsson, Hans, ...
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Planesas, P.
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Teyssier, D.
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Waters, Lbfm
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