Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12666/502
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dc.rights.licenseCopyright © 2020, Oxford University Press-
dc.contributor.authorBordiu, C.-
dc.contributor.authorBufano, F.-
dc.contributor.authorCerrigone, L.-
dc.contributor.authorUmana, G.-
dc.contributor.authorRizzo, J. R.-
dc.contributor.authorBuemi, C. S.-
dc.contributor.authorLeto, P.-
dc.contributor.authorCavallaro, F.-
dc.contributor.authorIngallinera, A.-
dc.contributor.authorLoru, S.-
dc.contributor.authorTrigilio, C.-
dc.contributor.authorRiggi, S.-
dc.date.accessioned2022-02-10T10:55:00Z-
dc.date.available2022-02-10T10:55:00Z-
dc.date.issued2021-02-20-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society 500(4): 5500–5514(2021)es
dc.identifier.issn0035-8711-
dc.identifier.otherhttps://academic.oup.com/mnras/article-abstract/500/4/5500/5996198-
dc.identifier.urihttp://hdl.handle.net/20.500.12666/502-
dc.descriptionThis article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model)es
dc.description.abstractWe present APEX observations of CO J = 3 → 2 and ALMA observations of CO J = 2 → 1, 13CO J = 2 → 1, and continuum towards the Galactic luminous blue variable AG Car. These new observations reveal the presence of a ring-like molecular structure surrounding the star. Morphology and kinematics of the gas are consistent with a slowly expanding torus located near the equatorial plane of AG Car. Using non-LTE line modelling, we derived the physical parameters of the gas, which is warm (∼50 K) and moderately dense (∼103 cm−3). The total mass of molecular gas in the ring is 2.7 ± 0.9 M⊙. We analysed the radio continuum map, which depicts a point-like source surrounded by a shallow nebula. From the flux of the point-like source, we derived a current mass-loss rate of M˙=(1.55±0.21)×10−5M⊙ yr−1. Finally, to better understand the complex circumstellar environment of AG Car, we put the newly detected ring in relation to the main nebula of dust and ionized gas. We discuss possible formation scenarios for the ring, namely, the accumulation of interstellar material due to the action of the stellar wind, the remnant of a close binary interaction or merger, and an equatorially enhanced mass-loss episode. If molecular gas formed in situ as a result of a mass eruption, it would account for at least a 30 per cent of the total mass ejected by AG Car. This detection adds a new piece to the puzzle of the complex mass-loss history of AG Car, providing new clues about the interplay between LBV stars and their surroundings.es
dc.description.sponsorshipEFOSC images of AG Car. This publication is based on data acquired with the Atacama Pathfinder Experiment (APEX). APEX is a collaboration between the Max-Planck-Institut fur Radioastronomie, the European Southern Observatory, and the Onsala Space Observatory. This paper has used the followingALMA data: ADS/JAO.ALMA#2019.1.01056.S. ALMA is a partnership of ESO (representing its member states), NSF (USA), and NINS (Japan), together with NRC (Canada), MOST, and ASIAA (Taiwan), and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO, and NAOJ. JRR acknowledges support from projects ESP2017-86582-C4-1-R and PID2019-105552RB-C41 from the Ministerio de Ciencia e Innovacion (Spain).es
dc.language.isoenges
dc.publisherOxford Academics: Oxford University Presses
dc.relationinfo:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/ESP2017-86582-C4-1-R/ES/CONTRIBUCION ESPAÑOLA A LAS MISIONES ESPACIALES CRIOGENICAS SPICA Y ATHENA, POST-OPERACIONES DE HERSCHEL Y EXPLOTACION CIENTIFICA MULTIFRECUENCIA/-
dc.relationinfo:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-105552RB-C41/ES/CONTRIBUCION DEL CAB A SPICA, DESARROLLO DE INSTRUMENTACION CRIOGENICA Y EXPLOTACION CIENTIFICA MULTILONGITUD DE ONDA/-
dc.subjectStars: evolutiones
dc.subjectStars: individual: AG Carinaes
dc.subjectStars: Massivees
dc.subjectStars: mass losses
dc.subjectISM: Abundanceses
dc.subjectISM: Moleculeses
dc.titleA warm molecular ring in AG Car: composing the mass-loss puzzlees
dc.typeinfo:eu-repo/semantics/articlees
dc.contributor.orcidRizzo, J. R. [0000-0002-8443-6631]-
dc.contributor.orcidCavallaro, F. [0000-0003-1856-6806]-
dc.contributor.orcidUmana, G. [0000-0002-6972-8388]-
dc.identifier.doi10.1093/mnras/staa3606-
dc.identifier.e-issn1365-2966-
dc.contributor.funderAgencia Estatal de Investigación (AEI)-
dc.description.peerreviewedPeerreviewes
dc.identifier.funderhttp://dx.doi.org/10.13039/501100011033-
dc.type.hasVersioninfo:eu-repo/semantics/publishedVersion-
dc.rights.accessRightsinfo:eu-repo/semantics/restrictedAccess-
dc.type.coarhttp://purl.org/coar/resource_type/c_6501-
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