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The extended molecular envelope of the asymptotic giant branch star Gruis as seen by ALMA I. Large-scale kinematic structure and CO excitation properties
L. Doan, S. Ramstedt, W. H. T. Vlemmings +8
The S-type asymptotic giant branch (AGB) star Gruis has a known companion at a separation of 400 AU. The envelope structure, including an equatorial torus and a fa…
The circumstellar envelope around the S-type AGB star W Aql Effects of an eccentric binary orbit
S. Ramstedt, S. Mohamed, W. H. T. Vlemmings +9
The CO(J=3-2) emission from the CSE of the binary S-type AGB star W Aql has been observed at subarcsecond resolution using ALMA. The aim of this paper is to investigate the wind pr…
Rings and filaments: The remarkable detached CO shell of U Antliae
F. Kerschbaum, M. Maercker, M. Brunner +11
Aims. Our goal is to characterize the intermediate age, detached shell carbon star U Antliae morphologically and physically in order to study the mass-loss evolution after a possib…
Single-dish and VLBI observations of Cygnus X-3 during the 2016 giant flare episode
E. Egron, A. Pellizzoni, M. Giroletti +34
In September 2016, the microquasar Cygnus X-3 underwent a giant radio flare, which was monitored for 6 days with the Medicina Radio Astronomical Station and the Sardinia Radio Tele…
First detection of methanol towards a post-AGB object, HD101584
H. Olofsson, W. H. T. Vlemmings, P. Bergman +5
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,…
Aperture synthesis imaging of the carbon AGB star R Sculptoris: Detection of a complex structure and a dominating spot on the stellar disk
M. Wittkowski, K. -H. Hofmann, S. Höfner +16
We present near-infrared interferometry of the carbon-rich asymptotic giant branch (AGB) star R Sculptoris. The visibility data indicate a broadly circular resolved stellar disk wi…