Chemical tracers of a highly eccentric AGB-main-sequence star binary
- Creators
- Danilovich, T.
- Malfait, J.
- van de Sande, M.
- Montargès, M.
- Kervella, P.
- de Ceuster, F.
- Coenegrachts, A.
- Millar, T. J.
- Richards, A. M. S.
- Decin, L.
- Gottlieb, C. A.
- Pinte, C.
- de Beck, E.
- Price, D. J.
- Wong, K. T.
- Bolte, J.
- Menten, K. M.
- Baudry, A.
- de Koter, A.
- Etoka, S.
- Gobrecht, D.
- Gray, M.
- Herpin, F.
- Jeste, M.
- Lagadec, E.
- Maes, S.
- Mcdonald, I.
- Marinho, L.
- Müller, H. S. P.
- Pimpanuwat, B.
- Plane, J. M. C.
- Sahai, R.
- Wallström, S. H. J.
- Yates, J.
- Zijlstra, A.
- Others:
- Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics (LESIA) ; Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris ; Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)
- Institut de Planétologie et d'Astrophysique de Grenoble (IPAG) ; Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Grenoble (Fédération OSUG)-Université Grenoble Alpes (UGA)
- Observatoire de la Côte d'Azur (OCA) ; Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
Citation
Description
Binary interactions have been proposed to explain a variety of circumstellar structures seen around evolved stars, including asymptotic giant branch (AGB) stars and planetary nebulae. Studies resolving the circumstellar envelopes of AGB stars have revealed spirals, disks and bipolar outflows, with shaping attributed to interactions with a companion. Here we use a combined chemical and dynamical analysis to reveal a highly eccentric and long-period orbit for W Aquilae, a binary system containing an AGB star and a main-sequence companion. Our results are based on anisotropic SiN emission, the detections of irregular NS and SiC emission towards the S-type star, and density structures observed in the CO emission. These features are all interpreted as having formed during periastron interactions. Our astrochemistry-based method can yield stringent constraints on the orbital parameters of long-period binaries containing AGB stars, and will be applicable to other systems.
Abstract
International audience
Additional details
- URL
- https://insu.hal.science/insu-04836889
- URN
- urn:oai:HAL:insu-04836889v1
- Origin repository
- UNICA