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- L2

Ämneskategorier

Astronomi, astrofysik och kosmologi

DOI

10.1051/0004-6361/201731170