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DEATHSTAR—CO Envelo...
DEATHSTAR—CO Envelope Size and Asymmetry of Nearby AGB Stars
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- Andriantsaralaza, Miora (författare)
- Uppsala universitet,Teoretisk astrofysik
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- Vlemmings, Wouter, 1974 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology,Chalmers Univ Technol, Dept Space Earth & Environm, Onsala Space Observ, S-43992 Onsala, Sweden.
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- Ramstedt, Sofia (författare)
- Uppsala universitet,Observationell astrofysik,Teoretisk astrofysik
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- Beck, Elvire De, 1985 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology,Chalmers Univ Technol, Dept Space Earth & Environm, Onsala Space Observ, S-43992 Onsala, Sweden.
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(creator_code:org_t)
- 2022-02-12
- 2022
- Engelska.
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Ingår i: Galaxies. - : MDPI AG. - 2075-4434. ; 10:1
- Relaterad länk:
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https://research.cha... (primary) (free)
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https://www.mdpi.com...
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https://doi.org/10.3...
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https://uu.diva-port... (primary) (Raw object)
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https://research.cha...
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https://doi.org/10.3...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- 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 = 2 − 1 and 3 − 2 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.
Ämnesord
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Meteorologi och atmosfärforskning (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Meteorology and Atmospheric Sciences (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- Mass loss
- Circumstellar matter
- Outflows
- AGB stars
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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