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First detection of methanol towards a post-AGB object, HD 101584

Hans Olofsson (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; Wouter Vlemmings (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; Per Bergman (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; E. M. L. Humphreys ; Michael Lindqvist (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; Matthias Maercker (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; L. Nyman ; S. Ramstedt ; Daniel Tafoya Martinez (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium)
Astronomy & Astrophysics (1432-0746). Vol. 603 (2017), p. L2.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: circumstellar matter, stars: individual: HD 101584, stars: AGB and post-AGB, radio lines: stars, Rich Circumstellar Envelopes, Different Chemical Type, Oxygen, Isotopic-Ratios, Millimeter Wavelengths, Star-Formation, Line Survey, Emission, Shock, Outflow, Mass



Denna post skapades 2017-09-06. Senast ändrad 2017-11-07.
CPL Pubid: 251684

 

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Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium (2010-2017)

Ämnesområden

Astronomi, astrofysik och kosmologi

Chalmers infrastruktur