Sökning: onr:"swepub:oai:research.chalmers.se:e2fc3d9c-16ab-4b75-ba94-dbba4b3d3fd0" >
Herschel observatio...
Herschel observations of extreme OH/IR stars: The isotopic ratios of oxygen as a sign-post for the stellar mass
-
- Justtanont, Kay, 1965 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
-
- Barlow, M. J. (författare)
- University College London (UCL)
-
- Blommaert, Jadl (författare)
- Vlaamse Instelling voor Technologisch Onderzoek (VITO),Flemish Institute for Technological Research,Vrije Universiteit Brüssel (VUB),Vrije Universiteit Brussel (VUB)
-
visa fler...
-
- Decin, L. (författare)
- Katholieke Universiteit Leuven
-
- Kerschbaum, F. (författare)
- Universität Wien,University of Vienna
-
- Matsuura, M. (författare)
- Cardiff University,University College London (UCL)
-
- Olofsson, Hans, 1952 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
-
- Owen, P. (författare)
- University College London (UCL)
-
- Royer, P. (författare)
- Katholieke Universiteit Leuven
-
- Swinyard, B. (författare)
- University College London (UCL),STFC Rutherford Appleton Laboratory
-
- Teyssier, D. (författare)
- European Space Astronomy Centre (ESAC)
-
- Waters, Lbfm (författare)
- Universiteit Van Amsterdam,University of Amsterdam,Netherlands Institute for Space Research (SRON)
-
- Yates, J. A. (författare)
- University College London (UCL)
-
visa färre...
-
(creator_code:org_t)
- 2015-06-15
- 2015
- Engelska.
-
Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 578
- Relaterad länk:
-
http://publications.... (primary) (free)
-
visa fler...
-
https://www.aanda.or...
-
https://doi.org/10.1...
-
https://research.cha...
-
visa färre...
Abstract
Ämnesord
Stäng
- © ESO 2015. Aims. The late stages of stellar evolution are mainly governed by the mass of the stars. Low- and intermediate-mass stars lose copious amounts of mass during the asymptotic giant branch (AGB) which obscure the central star making it difficult to study the stellar spectra and determine the stellar mass. In this study, we present observational data that can be used to determine lower limits to the stellar mass. Methods. Spectra of nine heavily reddened AGB stars taken by the Herschel Space Observatory display numerous molecular emission lines. The strongest emission lines are due to H2O. We search for the presence of isotopologues of H2O in these objects. Results. We detected the 16O and 17O isotopologues of water in these stars, but lines due to H218O are absent. The lack of 18O is predicted by a scenario where the star has undergone hot-bottom burning which preferentially destroys 18O relative to 16O and 17O. From stellar evolution calculations, this process is thought to occur when the stellar mass is above 5 M⊙ for solar metallicity. Hence, observations of different isotopologues of H2O can be used to help determine the lower limit to the initial stellar mass. Conclusions. From our observations, we deduce that these extreme OH/IR stars are intermediate-mass stars with masses of ≥5 M⊙. Their high mass-loss rates of ∼10-4M⊙ yr-1 may affect the enrichment of the interstellar medium and the overall chemical evolution of our Galaxy.
Ämnesord
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Nyckelord
- Stars: mass-loss
- Stars: evolution
- Submillimeter: stars
- Stars: AGB and post-AGB
- Circumstellar matter
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
Hitta via bibliotek
Till lärosätets databas
- Av författaren/redakt...
-
Justtanont, Kay, ...
-
Barlow, M. J.
-
Blommaert, Jadl
-
Decin, L.
-
Kerschbaum, F.
-
Matsuura, M.
-
visa fler...
-
Olofsson, Hans, ...
-
Owen, P.
-
Royer, P.
-
Swinyard, B.
-
Teyssier, D.
-
Waters, Lbfm
-
Yates, J. A.
-
visa färre...
- Om ämnet
-
- NATURVETENSKAP
-
NATURVETENSKAP
-
och Fysik
-
och Fusion plasma oc ...
- Artiklar i publikationen
-
Astronomy and As ...
- Av lärosätet
-
Chalmers tekniska högskola