The discovery of an asymmetric detached shell around the "fresh" carbon AGB star TX Psc
Artikel i vetenskaplig tidskrift, 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

Författare

M. Brunner

Universität Wien

M. Mecina

Universität Wien

Matthias Maercker

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik

E. A. Dorfi

Universität Wien

F. Kerschbaum

Universität Wien

Hans Olofsson

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik, Galaktisk astrofysik

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

Ämneskategorier

Oorganisk kemi

Astronomi, astrofysik och kosmologi

Materialkemi

DOI

10.1017/S1743921318006312

Mer information

Senast uppdaterat

2020-01-20