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- Title
The distribution of carbonaceous molecules and SiN around the S-type AGB star W Aquilae.
- Authors
Danilovich, T.; Van de Sande, M.; Richards, A. M. S.
- Abstract
S-type AGB stars, with C/O ratios close to 1, are expected to have a mixed circumstellar chemistry as they transition from being oxygen-rich stars to carbon-rich stars. Recently, several different carbonaceous molecules, thought to be more characteristic of carbon stars, have been found in the circumstellar envelope of the S-type AGB star W Aql. We have obtained new high spatial resolution ALMA images of some of these molecules, specifically HC3N, SiC2 and SiC, and SiN, which we present here. We report diverse behaviour for these molecules, with SiC2 being seen with a symmetric spatial distribution around the star, SiN and SiC being asymmetrically distributed to the north-east of the star, and HC3N being seen in a broken shell to the south-west. These differing distributions point to complex dynamics in the circumstellar envelope of W Aql.
- Subjects
ASYMPTOTIC giant branch stars; RED giants; CIRCUMSTELLAR matter; CARBONACEOUS aerosols; ATMOSPHERIC aerosols; N stars; ATACAMA Large Millimeter Array (Project)
- Publication
Proceedings of the International Astronomical Union, 2022, Vol 16, Issue S366, p178
- ISSN
1743-9213
- Publication type
Article
- DOI
10.1017/S1743921322000096