Next Article in Journal
Stochastic Gravitational-Wave Backgrounds: Current Detection Efforts and Future Prospects
Next Article in Special Issue
Ionization-Gasdynamic Simulations of Wind-Blown Nebulae around Massive Stars
Previous Article in Journal / Special Issue
A Preliminary Investigation of CSPN in the HASH Database

DEATHSTAR—CO Envelope Size and Asymmetry of Nearby AGB Stars

Theoretical Astrophysics, Division for Astronomy and Space Physics, Department of Physics and Astronomy, Uppsala University, Box 516, 751 20 Uppsala, Sweden
Department of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, 439 92 Onsala, Sweden
Author to whom correspondence should be addressed.
Academic Editors: Martín Guerrero, Noam Soker and Quentin A. Parker
Galaxies 2022, 10(1), 33;
Received: 7 January 2022 / Revised: 3 February 2022 / Accepted: 8 February 2022 / Published: 12 February 2022
(This article belongs to the Special Issue Asymmetric Planetary Nebulae 8e)
Low- and intermediate-mass stars evolve into asymptotic giant branch (AGB) stars near the end of their lives, losing mass through slow and massive winds. The ejected material creates a chemically-rich expanding envelope around the star, namely the circumstellar envelope (CSE). Investigating the anisotropy of the mass-loss phenomenon on the AGB is crucial in gaining a better understanding of the shaping of the CSE during the transition from AGB star to planetary nebula (PN). We investigate possible signs of deviation from spherical symmetry in the CO-emitting CSEs of 70 AGB stars by analysing their emission maps in CO J=21 and 32 observed with the Atacama Compact Array, as part of the DEATHSTAR project. We find that about one third of the sources are likely aspherical, as they exhibit large-scale asymmetries that are unlikely to have been created by a smooth wind. Further high-resolution observations would be necessary to investigate the nature of, and the physical processes behind, these asymmetrical structures. View Full-Text
Keywords: AGB stars; mass loss; outflows; circumstellar matter AGB stars; mass loss; outflows; circumstellar matter
Show Figures

Figure 1

MDPI and ACS Style

Andriantsaralaza, M.; Vlemmings, W.; Ramstedt, S.; De Beck, E. DEATHSTAR—CO Envelope Size and Asymmetry of Nearby AGB Stars. Galaxies 2022, 10, 33.

AMA Style

Andriantsaralaza M, Vlemmings W, Ramstedt S, De Beck E. DEATHSTAR—CO Envelope Size and Asymmetry of Nearby AGB Stars. Galaxies. 2022; 10(1):33.

Chicago/Turabian Style

Andriantsaralaza, Miora, Wouter Vlemmings, Sofia Ramstedt, and Elvire De Beck. 2022. "DEATHSTAR—CO Envelope Size and Asymmetry of Nearby AGB Stars" Galaxies 10, no. 1: 33.

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

Back to TopTop