[Genèse du vent des étoiles riches en oxygène de la branche AGB : examen d’un échantillon d’étoiles proches]
Le mécanisme couramment accepté comme présidant à la formation du vent des étoiles AGB riches en oxygène combine deux effets : un élan initial qui projette le gaz au-dessus de la photosphère, donné par des ondes de choc produites par pulsations stellaires et cellules de convection, suivi d’une accélération alimentée par la pression de radiation stellaire sur des grains de poussière. Nous examinons dans quelle mesure ce modèle est corroboré par les observations de six étoiles proches faites dans les domaines du visible/infrarouge par le VLT et dans le domaine millimétrique par ALMA. Nous montrons que bien que généralement corroboré, n’ayant souffert aucune contradiction et servant utilement de guide aux recherches actuelles, il a encore besoin de nombreuses observations complémentaires pour être validé de manière fiable. En particulier, afin de mieux préciser les rôles joués par pulsations stellaires et mouvements de convection, il faudra mesurer la courbe de lumière en même temps qu’on observera, avec la meilleure résolution angulaire possible, les émissions des domaines millimétrique et visible/infrarouge. Il faudra clarifier comment la grande variabilité révélée par les observations de la photosphère est compatible avec la persistance sur des décennies, voire des siècles, de l’anisotropie de l’enveloppe. De nouvelles observations du gaz proche de l’étoile seront nécessaires pour préciser le mécanisme présidant à sa rotation, en particulier pour R Dor, L2 Pup et EP Aqr. Nous suggérons que la présence de compagnons stellaires ou planétaires n’a pratiquement pas d’impact sur la genèse du vent et ne fait que modifier son évolution ultérieure.
The commonly accepted mechanism governing the formation of the nascent wind in oxygen-rich AGB stars combines an initial boost above the photosphere, given by shock waves resulting from stellar pulsations and convective cell partition, with a subsequent acceleration fuelled by the radiation pressure of the star on dust grains. We use six nearby stars, for which detailed studies of visible and infrared observations at the VLT and millimetre observations at ALMA are available, to assess the extent to which the validity of this picture is currently corroborated. We show that while providing a very useful guide to current research and having received general support and suffered no contradiction, it still requires many additional observations to be reliably validated. In particular, observations of the highest possible angular resolution at both millimetre and visible/infrared wavelengths, performed in conjunction with measurements of the light curve, are necessary to tell apart the respective roles played by convection and stellar pulsations. The observed concurrence of high variability near the photosphere with persistence over decades, or even centuries, of the global anisotropy displayed by the CSE needs to be understood. New observations of the close neighbourhood of the star are required to elucidate the mechanism that governs rotation, in particular in the cases of R Dor, L2 Pup and EP Aqr. We argue that the presence of stellar or planetary companions does not seriously impact the formation of the nascent wind and only modifies its subsequent evolution.
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Mot clés : Étoiles AGB, Enveloppe circumstellaire, Raies d’émission radio, Émission visible/infrarouge, Gaz/poussière, Pulsation/convection
Pierre Darriulat 1 ; Do Thi Hoai 1 ; Pham Thi Tuyet Nhung 1 ; Pham Ngoc Diep 1 ; Nguyen Bich Ngoc 1 ; Tran Thi Thai 1 ; Pham Tuan Anh 1
CC-BY 4.0
@article{CRPHYS_2024__25_G1_219_0,
author = {Pierre Darriulat and Do Thi Hoai and Pham Thi Tuyet Nhung and Pham Ngoc Diep and Nguyen Bich Ngoc and Tran Thi Thai and Pham Tuan Anh},
title = {On the nascent wind of oxygen-rich {AGB} stars: scrutiny of a sample of nearby stars},
journal = {Comptes Rendus. Physique},
pages = {219--250},
publisher = {Acad\'emie des sciences, Paris},
volume = {25},
year = {2024},
doi = {10.5802/crphys.185},
language = {en},
}
TY - JOUR AU - Pierre Darriulat AU - Do Thi Hoai AU - Pham Thi Tuyet Nhung AU - Pham Ngoc Diep AU - Nguyen Bich Ngoc AU - Tran Thi Thai AU - Pham Tuan Anh TI - On the nascent wind of oxygen-rich AGB stars: scrutiny of a sample of nearby stars JO - Comptes Rendus. Physique PY - 2024 SP - 219 EP - 250 VL - 25 PB - Académie des sciences, Paris DO - 10.5802/crphys.185 LA - en ID - CRPHYS_2024__25_G1_219_0 ER -
%0 Journal Article %A Pierre Darriulat %A Do Thi Hoai %A Pham Thi Tuyet Nhung %A Pham Ngoc Diep %A Nguyen Bich Ngoc %A Tran Thi Thai %A Pham Tuan Anh %T On the nascent wind of oxygen-rich AGB stars: scrutiny of a sample of nearby stars %J Comptes Rendus. Physique %D 2024 %P 219-250 %V 25 %I Académie des sciences, Paris %R 10.5802/crphys.185 %G en %F CRPHYS_2024__25_G1_219_0
Pierre Darriulat; Do Thi Hoai; Pham Thi Tuyet Nhung; Pham Ngoc Diep; Nguyen Bich Ngoc; Tran Thi Thai; Pham Tuan Anh. On the nascent wind of oxygen-rich AGB stars: scrutiny of a sample of nearby stars. Comptes Rendus. Physique, Volume 25 (2024), pp. 219-250. doi : 10.5802/crphys.185. https://comptes-rendus.academie-sciences.fr/physique/articles/10.5802/crphys.185/
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