Volume 603, July 2017
|Number of page(s)||5|
|Published online||11 July 2017|
First detection of methanol towards a post-AGB object, HD 101584
1 Dept. of Space, Earth and Environment, Chalmers Univ. of Technology, Onsala Space Observatory, 43992 Onsala, Sweden
2 ESO, Karl-Schwarzschild-Str. 2, 85748 Garching bei München, Germany
3 Joint ALMA Observatory, Alonso de Cordova 3107, Vitacura, Santiago de Chile, Chile
4 ESO, Alonso de Cordova 3107, Vitacura, Santiago, Chile
5 Dept. of Physics and Astronomy, Uppsala University, PO Box 516, 75120 Uppsala, Sweden
Received: 14 May 2017
Accepted: 19 June 2017
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.
Key words: circumstellar matter / stars: individual: HD 101584 / stars: AGB and post-AGB / radio lines: stars
© ESO, 2017
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