| Issue |
A&A
Volume 680, December 2023
|
|
|---|---|---|
| Article Number | A12 | |
| Number of page(s) | 10 | |
| Section | Interstellar and circumstellar matter | |
| DOI | https://doi.org/10.1051/0004-6361/202346120 | |
| Published online | 05 December 2023 | |
Extended far-UV emission surrounding asymptotic giant branch stars as seen by GALEX
1
Department of Astrophysics, University of Vienna,
Türkenschanzstrasse 17,
1180
Vienna, Austria
e-mail: vlad.rastau@univie.ac.at
2
Department of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory,
439 92
Onsala, Sweden
3
Sternwarte Bärenstein,
Feldstraße 17,
09471
Bärenstein, Germany
4
Équipe StDr, Montfraze,
01370
Saint-Étienne-du-Bois, France
5
2SPOT (Southern Spectroscopic Observatory Team),
45 Chemin du Lac,
38690
Châbons, France
Received:
10
February
2023
Accepted:
25
September
2023
Aims. Our goal is to study the long-term mass-loss rate characteristics of asymptotic giant branch (AGB) stars through wind-wind and wind-interstellar medium interaction.
Methods. Far-ultraviolet (FUV) images from the GALEX survey are used to investigate extended UV emission associated with AGB stars.
Results. FUV emission was found towards eight objects. The emission displays different shapes and sizes; interaction regions were identified, often with infrared counterparts, but no equivalent near-ultraviolet (NUV) emission was found in most cases.
Conclusions. The FUV emission is likely attributed to shock-excited molecular hydrogen, considering the lack of NUV emission and the large space velocities of the objects, and makes it possible to trace old structures that are too faint to be observed, for instance, in the infrared.
Key words: stars: AGB and post-AGB / stars: mass-loss / stars: winds, outflows / ultraviolet: stars
© The Authors 2023
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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