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First detection of methanol towards a post-AGB object, HD 101584
Chalmers, Onsala Space Observ, Dept Space Earth & Environm, S-43992 Onsala, Sweden.
Chalmers, Onsala Space Observ, Dept Space Earth & Environm, S-43992 Onsala, Sweden.
Chalmers, Onsala Space Observ, Dept Space Earth & Environm, S-43992 Onsala, Sweden.
ESO, Karl Schwarzschild Str 2, D-85748 Garching, Germany.
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2017 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 603, article id L2Article in journal, Letter (Other academic) Published
Abstract [en]

The circumstellar environments of objects on the asymptotic giant branch and beyond are rich in molecular species. Nevertheless, methanol has never been detected in such an object, and is therefore often taken as a clear signpost for a young stellar object. However, we report the first detection of CH3OH in a post-AGB object, HD 101584, using ALMA. Its emission, together with emissions from CO, SiO, SO, CS, and H2CO, comes from two extreme velocity spots on either side of the object where a high-velocity outflow appears to interact with the surrounding medium. We have derived molecular abundances, and propose that the detected molecular species are the effect of a post-shock chemistry where circumstellar grains play a role. We further provide evidence that HD 101584 was a low-mass, M-type AGB star.

Place, publisher, year, edition, pages
2017. Vol. 603, article id L2
Keywords [en]
circumstellar matter, stars: individual: HD 101584, stars: AGB and post-AGB, radio lines: stars
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-361225DOI: 10.1051/0004-6361/201731170ISI: 000406619100148OAI: oai:DiVA.org:uu-361225DiVA, id: diva2:1250893
Funder
Swedish Research CouncilEU, European Research Council, 614264Available from: 2018-09-25 Created: 2018-09-25 Last updated: 2018-09-25Bibliographically approved

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