Homan, Ward, Pimpanuwat, Bannawit, Herpin, Fabrice, Danilovich, Taissa ORCID: 0000-0002-1283-6038, McDonald, Iain, Wallstroem, Sofia H. J., Richards, Anita M. S., Baudry, Alain, Sahai, Raghvendra, Millar, Tom J., de Koter, Alex, Gottlieb, C. A., Kervella, Pierre, Montarges, Miguel, Van de Sande, Marie ORCID: 0000-0001-9298-6265, Decin, Leen, Zijlstra, Albert, Etoka, Sandra, Jeste, Manali ORCID: 0000-0003-2435-6581, Mueller, Holger S. P., Maes, Silke ORCID: 0000-0003-4159-9964, Malfait, Jolien, Menten, Karl, Plane, John, Lee, Kelvin, Waters, Rens, Wong, Ka Tat, Lagadec, Eric, Gobrecht, David, Yates, Jeremy, Price, Daniel, Cannon, Emily ORCID: 0000-0002-9757-7927, Bolte, Jan, De Ceuster, Frederik ORCID: 0000-0001-5887-8498, Nuth, Joe, Philip Sindel, Jan, Kee, Dylan, Gray, Malcolm D. and El Mellah, Ileyk (2021). ATOMIUM: The astounding complexity of the near circumstellar environment of the M-type AGB star R Hydrae: I. Morpho-kinematical interpretation of CO and SiO emission. Astron. Astrophys., 651. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

Evolved low- to intermediate-mass stars are known to shed their gaseous envelope into a large, dusty, molecule-rich circumstellar nebula which typically develops a high degree of structural complexity. Most of the large-scale, spatially correlated structures in the nebula are thought to originate from the interaction of the stellar wind with a companion. As part of the ATOMIUM large programme, we observed the M-type asymptotic giant branch (AGB) star R Hydrae with the Atacama Large Millimeter/submillimeter Array. The morphology of the inner wind of R Hya, which has a known companion at similar to 3500 au, was determined from maps of CO and SiO obtained at high angular resolution. A map of the CO emission reveals a multi-layered structure consisting of a large elliptical feature at an angular scale of similar to 10 '' that is oriented along the north-south axis. The wind morphology within the elliptical feature is dominated by two hollow bubbles. The bubbles are on opposite sides of the AGB star and lie along an axis with a position angle of similar to 115 degrees. Both bubbles are offset from the central star, and their appearance in the SiO channel maps indicates that they might be shock waves travelling through the AGB wind. An estimate of the dynamical age of the bubbles yields an age of the order of 100 yr, which is in agreement with the previously proposed elapsed time since the star last underwent a thermal pulse. When the CO and SiO emission is examined on subarcsecond angular scales, there is evidence for an inclined, differentially rotating equatorial density enhancement, strongly suggesting the presence of a second nearby companion. The position angle of the major axis of this disc is similar to 70 degrees in the plane of the sky. We tentatively estimate that a lower limit on the mass of the nearby companion is similar to 0.65 M-circle dot on the basis of the highest measured speeds in the disc and the location of its inner rim at similar to 6 au from the AGB star.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Homan, WardUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pimpanuwat, BannawitUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Herpin, FabriceUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Danilovich, TaissaUNSPECIFIEDorcid.org/0000-0002-1283-6038UNSPECIFIED
McDonald, IainUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wallstroem, Sofia H. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Richards, Anita M. S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Baudry, AlainUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sahai, RaghvendraUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Millar, Tom J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
de Koter, AlexUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gottlieb, C. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kervella, PierreUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Montarges, MiguelUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Van de Sande, MarieUNSPECIFIEDorcid.org/0000-0001-9298-6265UNSPECIFIED
Decin, LeenUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zijlstra, AlbertUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Etoka, SandraUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jeste, ManaliUNSPECIFIEDorcid.org/0000-0003-2435-6581UNSPECIFIED
Mueller, Holger S. P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Maes, SilkeUNSPECIFIEDorcid.org/0000-0003-4159-9964UNSPECIFIED
Malfait, JolienUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Menten, KarlUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Plane, JohnUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lee, KelvinUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Waters, RensUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wong, Ka TatUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lagadec, EricUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gobrecht, DavidUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Yates, JeremyUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Price, DanielUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cannon, EmilyUNSPECIFIEDorcid.org/0000-0002-9757-7927UNSPECIFIED
Bolte, JanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
De Ceuster, FrederikUNSPECIFIEDorcid.org/0000-0001-5887-8498UNSPECIFIED
Nuth, JoeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Philip Sindel, JanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kee, DylanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gray, Malcolm D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
El Mellah, IleykUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-606593
DOI: 10.1051/0004-6361/202140512
Journal or Publication Title: Astron. Astrophys.
Volume: 651
Date: 2021
Publisher: EDP SCIENCES S A
Place of Publication: LES ULIS CEDEX A
ISSN: 1432-0746
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
MASS-LOSS; DETACHED SHELLS; MIRA; PULSATION; EVOLUTION; WIND; SHOCKS; MODELS; GAS; TEMPERATURESMultiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/60659

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