The discovery of an asymmetric detached shell around the "fresh" carbon AGB star TX Psc
Journal article, 2019
We present ALMA observations of the circumstellar envelope around the AGB carbon star TX Psc in molecular CO(2-1) emission, and detect a previously unknown detached shell with filamentary structure and elliptical shape. Up to now, all observed detached shells are found around carbon AGB stars and are of remarkable spherical symmetry. The elliptical shell around TX Psc is the first clear exception to that rule, with TX Psc being classified as rather "fresh" carbon star, that most likely has only experienced very few thermal pulses yet. We investigate and discuss the 3D structure of the CSE and its most likely formation scenarios, as well as the link of this peculiar detached shell to the AGB evolutionary status of TX Psc.
stars: evolution
stars: mass-loss
stars: AGB and post-AGB
stars: carbon
Author
M. Brunner
University of Vienna
M. Mecina
University of Vienna
Matthias Maercker
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
E. A. Dorfi
University of Vienna
F. Kerschbaum
University of Vienna
Hans Olofsson
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics, Galactic Astrophysics
G. Rau
NASA Goddard Space Flight Center
Catholic University of America
Proceedings of the International Astronomical Union
1743-9213 (ISSN) 1743-9221 (eISSN)
Vol. 14 360-361Subject Categories
Inorganic Chemistry
Astronomy, Astrophysics and Cosmology
Materials Chemistry
DOI
10.1017/S1743921318006312