First detection of methanol towards a post-AGB object, HD 101584
Artikel i vetenskaplig tidskrift, 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.
Shock
Millimeter Wavelengths
stars: AGB and post-AGB
Oxygen
Isotopic-Ratios
Star-Formation
Outflow
Different Chemical Type
Line Survey
Mass
radio lines: stars
Emission
circumstellar matter
stars: individual: HD 101584
Rich Circumstellar Envelopes
Författare
Hans Olofsson
Chalmers, Rymd- och geovetenskap, Onsala rymdobservatorium
Wouter Vlemmings
Chalmers, Rymd- och geovetenskap, Onsala rymdobservatorium
Per Bergman
Chalmers, Rymd- och geovetenskap, Onsala rymdobservatorium
E. M. Humphreys
European Southern Observatory (ESO)
Michael Lindqvist
Chalmers, Rymd- och geovetenskap, Onsala rymdobservatorium
Matthias Maercker
Chalmers, Rymd- och geovetenskap, Onsala rymdobservatorium
L. Nyman
European Southern Observatory Santiago
Atacama Large Millimeter-submillimeter Array (ALMA)
S. Ramstedt
Uppsala universitet
Daniel Tafoya Martinez
Chalmers, Rymd- och geovetenskap, Onsala rymdobservatorium
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 603 L2- L2Ämneskategorier
Astronomi, astrofysik och kosmologi
DOI
10.1051/0004-6361/201731170