The nascent wind of AGB star R Doradus: evidence for a recent episode of enhanced mass loss

Abstract

We analyse ALMA observations of the SO($J_K=6_5-5_4$) emission of the circumstellar envelope of oxygen-rich AGB star R Dor, probing distances between 20 and 100 au from the star where the nascent wind is building up. We give evidence for the slow wind to host, in addition to a previously observed rotating disc, a radial outflow covering very large solid angles and displaying strong inhomogeneity both in direction and radially: the former takes the form of multiple cores and the latter displays a radial dependence suggesting an episode of enhanced mass loss having occurred a century or so ago.

13 pages, 17 figures, submitted for publication in MNRAS

References in corpus (2)

• The 12CO/13CO ratio in AGB stars of different chemical type-Connection to the 12C/13C ratio and the evolution along the AGB
• Gas infall and possible circumstellar rotation in R Leo

Cited by in corpus (4)

• Morpho-kinematics of the circumstellar envelope of the AGB star R Dor: a global view
• A large bubble around the AGB star R Dor detected in the UV
• Molecules, shocks, and disk in the axi-symmetric wind of the MS-type AGB star RS Cancri
• Millimetre observations of the S-type AGB star $\chi$ Cygni: variability of the emission of the inner envelope