First detection of methanol towards a post-AGB object, HD 101584
Journal article, 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
Author
Hans Olofsson
Chalmers, Earth and Space Sciences, Onsala Space Observatory
Wouter Vlemmings
Chalmers, Earth and Space Sciences, Onsala Space Observatory
Per Bergman
Chalmers, Earth and Space Sciences, Onsala Space Observatory
E. M. Humphreys
European Southern Observatory (ESO)
Michael Lindqvist
Chalmers, Earth and Space Sciences, Onsala Space Observatory
Matthias Maercker
Chalmers, Earth and Space Sciences, Onsala Space Observatory
L. Nyman
European Southern Observatory Santiago
Atacama Large Millimeter-submillimeter Array (ALMA)
S. Ramstedt
Uppsala University
Daniel Tafoya Martinez
Chalmers, Earth and Space Sciences, Onsala Space Observatory
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 603 L2- L2Subject Categories
Astronomy, Astrophysics and Cosmology
DOI
10.1051/0004-6361/201731170