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


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. 14 360-361

Subject Categories

Inorganic Chemistry

Astronomy, Astrophysics and Cosmology

Materials Chemistry



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