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The discovery of an asymmetric detached shell around the “fresh” carbon AGB star TX Psc

Published online by Cambridge University Press:  30 December 2019

M. Brunner ,
M. Mečina ,
M. Maercker ,
E. A. Dorfi ,
F. Kerschbaum ,
H. Olofsson  and
G. Rau
M. Brunner
Affiliation:
Department for Astrophysics, University of Vienna, Türkenschanzstraße 17, A-1180 Vienna email: magdalena.brunner@univie.ac.at
M. Mečina
Affiliation:
Department for Astrophysics, University of Vienna, Türkenschanzstraße 17, A-1180 Vienna email: magdalena.brunner@univie.ac.at
M. Maercker
Affiliation:
Department of Space, Earth & Environment, Chalmers Univ. of Tech., 43992 Onsala, Sweden
E. A. Dorfi
Affiliation:
Department for Astrophysics, University of Vienna, Türkenschanzstraße 17, A-1180 Vienna email: magdalena.brunner@univie.ac.at
F. Kerschbaum
Affiliation:
Department for Astrophysics, University of Vienna, Türkenschanzstraße 17, A-1180 Vienna email: magdalena.brunner@univie.ac.at
H. Olofsson
Affiliation:
Department of Space, Earth & Environment, Chalmers Univ. of Tech., 43992 Onsala, Sweden
G. Rau
Affiliation:
NASA Goddard Space Flight Center, Code 667, Greenbelt, MD 20771, USA Department of Physics, The Catholic University of America, Washington, DC 20064, USA
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Abstract

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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.

Keywords

stars: AGB and post-AGBstars: carbonstars: evolutionstars: mass-loss
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S343: Why Galaxies Care About AGB Stars: A Continuing Challenge through Cosmic Time , August 2018 , pp. 360 - 361
Copyright
© International Astronomical Union 2019 

References

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