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Atmosphere of Betel...
Atmosphere of Betelgeuse before and during the Great Dimming event revealed by tomography
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- Kravchenko, K. (författare)
- European Southern Observ, Alonso de Cordova 3107, Santiago 19001, Chile.;Max Planck Inst Extraterr Phys, Giessenbachstr 1, D-85748 Garching, Germany.
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- Jorissen, A. (författare)
- Univ Libre Bruxelles, Inst Astron & Astrophys, CP 226,Blvd Triomphe, B-1050 Brussels, Belgium.
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- Van Eck, S. (författare)
- Univ Libre Bruxelles, Inst Astron & Astrophys, CP 226,Blvd Triomphe, B-1050 Brussels, Belgium.
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- Merle, T. (författare)
- Univ Libre Bruxelles, Inst Astron & Astrophys, CP 226,Blvd Triomphe, B-1050 Brussels, Belgium.
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- Chiavassa, A. (författare)
- Univ Cote Azur, CNRS, Observ Cote Azur, CS 34229, F-06304 Nice 4, France.
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- Paladini, C. (författare)
- European Southern Observ, Alonso de Cordova 3107, Santiago 19001, Chile.
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- Freytag, Bernd, Dr. (författare)
- Uppsala universitet,Teoretisk astrofysik
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- Plez, B. (författare)
- Univ Montpellier, CNRS, Lab Univers & Particules Montpellier, F-34095 Montpellier 05, France.
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- Montarges, M. (författare)
- Katholieke Univ Leuven, Inst Astron, Celestijnenlaan 200D B2401, B-3001 Leuven, Belgium.;Univ Paris, Sorbonne Univ, Univ PSL, CNRS,LESIA,Observ Paris, 5 Pl Jules Janssen, F-92195 Meudon, France.
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- Van Winckel, H. (författare)
- Katholieke Univ Leuven, Inst Astron, Celestijnenlaan 200D B2401, B-3001 Leuven, Belgium.
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European Southern Observ, Alonso de Cordova 3107, Santiago 19001, Chile;Max Planck Inst Extraterr Phys, Giessenbachstr 1, D-85748 Garching, Germany. Univ Libre Bruxelles, Inst Astron & Astrophys, CP 226,Blvd Triomphe, B-1050 Brussels, Belgium. (creator_code:org_t)
- 2021-06-22
- 2021
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 650
- Relaterad länk:
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https://doi.org/10.1...
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https://uu.diva-port... (primary) (Raw object)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Context. Despite being the best studied red supergiant star in our Galaxy, the physics behind the photometric variability and mass loss of Betelgeuse is poorly understood. Moreover, recently the star has experienced an unusual fading with its visual magnitude reaching a historical minimum. The nature of this event was investigated by several studies where mechanisms, such as episodic mass loss and the presence of dark spots in the photosphere, were invoked.Aims. We aim to relate the atmospheric dynamics of Betelgeuse to its photometric variability, with the main focus on the dimming event.Methods. We used the tomographic method which allowed us to probe different depths in the stellar atmosphere and to recover the corresponding disk-averaged velocity field. The method was applied to a series of high-resolution HERMES observations of Betelgeuse. Variations in the velocity field were then compared with photometric and spectroscopic variations.Results. The tomographic method reveals that the succession of two shocks along our line-of-sight (in February 2018 and January 2019), the second one amplifying the effect of the first one, combined with underlying convection and/or outward motion present at this phase of the 400 d pulsation cycle, produced a rapid expansion of a portion of the atmosphere of Betelgeuse and an outflow between October 2019 and February 2020. This resulted in a sudden increase in molecular opacity in the cooler upper atmosphere of Betelgeuse and, thus, in the observed unusual decrease of the star's brightness.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- stars: atmospheres
- supergiants
- line: formation
- techniques: spectroscopic
- radiative transfer
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- ref (ämneskategori)
- art (ämneskategori)
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- Av författaren/redakt...
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Kravchenko, K.
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Jorissen, A.
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Van Eck, S.
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Merle, T.
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Chiavassa, A.
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Paladini, C.
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Freytag, Bernd, ...
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Plez, B.
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Montarges, M.
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Van Winckel, H.
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- NATURVETENSKAP
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Uppsala universitet