The shock-heated atmosphere of an asymptotic giant branch star resolved by ALMA

Vlemmings, Wouter, 1974 (author): Chalmers tekniska högskola,Chalmers University of Technology,Onsala Space Observ, Chalmers Univ Technol, Dept Space Earth & Environm, S-43992 Onsala, Sweden.

Khouri, Theo, 1985 (author): Chalmers tekniska högskola,Chalmers University of Technology,Onsala Space Observ, Chalmers Univ Technol, Dept Space Earth & Environm, S-43992 Onsala, Sweden.

O Gorman, Eamon, 1984 (author): Dublin Institute for Advanced Studies,Dublin Inst Adv Studies, 31 Fitzwilliam Pl, Dublin 2, Ireland.

De Beck, Elvire, 1985 (author): Chalmers tekniska högskola,Chalmers University of Technology,Onsala Space Observ, Chalmers Univ Technol, Dept Space Earth & Environm, S-43992 Onsala, Sweden.

Humphreys, E. (author): European Southern Observatory (ESO),ESO Karl Schwarzschild Str 2, D-85748 Garching, Germany.

Lankhaar, Boy, 1991 (author): Chalmers tekniska högskola,Chalmers University of Technology,Onsala Space Observ, Chalmers Univ Technol, Dept Space Earth & Environm, S-43992 Onsala, Sweden.

Maercker, Matthias, 1979 (author): Chalmers tekniska högskola,Chalmers University of Technology,Onsala Space Observ, Chalmers Univ Technol, Dept Space Earth & Environm, S-43992 Onsala, Sweden.

Olofsson, Hans, 1952 (author): Chalmers tekniska högskola,Chalmers University of Technology,Onsala Space Observ, Chalmers Univ Technol, Dept Space Earth & Environm, S-43992 Onsala, Sweden.

Tafoya Martinez, Daniel, 1981 (author): Chalmers tekniska högskola,Chalmers University of Technology,Onsala Space Observ, Chalmers Univ Technol, Dept Space Earth & Environm, S-43992 Onsala, Sweden.

Takigawa, A. (author): Kyoto University,Kyoto Univ, Grad Sch Sci, Hakubi Ctr Adv Res Div Earth & Planetary Sci, Kitashirakawa Oiwakecho, Kyoto 6068502, Japan.

Chalmers tekniska högskola Onsala Space Observ, Chalmers Univ Technol, Dept Space Earth & Environm, S-43992 Onsala, Sweden (creator_code:org_t)

2017-10-30
2017
English.
In: Nature Astronomy. - : Springer Science and Business Media LLC. - 2397-3366. ; 1:12, s. 848-853

Related links:: http://publications.... (primary) (free); show more...; http://arxiv.org/pdf...; https://research.cha...; https://doi.org/10.1...; https://urn.kb.se/re...; show less...

Abstract Subject headings

Our current understanding of the chemistry and mass-loss processes in Sun-like stars at the end of their evolution depends critically on the description of convection, pulsations and shocks in the extended stellar atmosphere 1 . Three-dimensional hydrodynamical stellar atmosphere models provide observational predictions 2 , but so far the resolution to constrain the complex temperature and velocity structures seen in the models has been lacking. Here we present submillimetre continuum and line observations that resolve the atmosphere of the asymptotic giant branch star W Hydrae. We show that hot gas with chromospheric characteristics exists around the star. Its filling factor is shown to be small. The existence of such gas requires shocks with a cooling time longer than commonly assumed. A shocked hot layer will be an important ingredient in current models of stellar convection, pulsation and chemistry at the late stages of stellar evolution.

By the author/editor: Vlemmings, Woute ...; Khouri, Theo, 19 ...; O Gorman, Eamon, ...; De Beck, Elvire, ...; Humphreys, E.; Lankhaar, Boy, 1 ...; show more...; Maercker, Matthi ...; Olofsson, Hans, ...; Ramstedt, Sofia; Tafoya Martinez, ...; Takigawa, A.; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Astronomy Astrop ...

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