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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.
Vise andre og tillknytning
2017 (engelsk)Inngår i: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 603, artikkel-id L2Artikkel i tidsskrift, Letter (Annet vitenskapelig) 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.

sted, utgiver, år, opplag, sider
2017. Vol. 603, artikkel-id L2
Emneord [en]
circumstellar matter, stars: individual: HD 101584, stars: AGB and post-AGB, radio lines: stars
HSV kategori
Identifikatorer
URN: urn:nbn:se:uu:diva-361225DOI: 10.1051/0004-6361/201731170ISI: 000406619100148OAI: oai:DiVA.org:uu-361225DiVA, id: diva2:1250893
Forskningsfinansiär
Swedish Research CouncilEU, European Research Council, 614264Tilgjengelig fra: 2018-09-25 Laget: 2018-09-25 Sist oppdatert: 2018-09-25bibliografisk kontrollert

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