VLTI-MATISSE chromatic aperture-synthesis imaging of η Carinae's stellar wind across the Br α line: Periastron passage observations in February 2020

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dc.contributor.authorWeigelt, G.
dc.contributor.authorHofmann, K.-H.
dc.contributor.authorSchertl, D.
dc.contributor.authorLopez, B.
dc.contributor.authorPetrov, R.G.
dc.contributor.authorLagarde, S.
dc.contributor.authorBerio, Ph.
dc.contributor.authorJaffe, W.
dc.contributor.authorHenning, Th.
dc.contributor.authorMillour, F.
dc.contributor.authorMeilland, A.
dc.contributor.authorAllouche, F.
dc.contributor.authorRobbe-Dubois, S.
dc.contributor.authorMatter, A.
dc.contributor.authorCruzalèbes, p.
dc.contributor.authorHillier, D.J.
dc.contributor.authorRussell, C.M.P.
dc.contributor.authorMadura, T.
dc.contributor.authorGull, T.R.
dc.contributor.authorCorcoran, M.F.
dc.contributor.authorDamineli, A.
dc.contributor.authorMoffat, A.F.J.
dc.contributor.authorMorris, P.W.
dc.contributor.authorRichardson, N.D.
dc.contributor.authorPaladini, C.
dc.contributor.authorSchöller, M.
dc.contributor.authorMérand, A.
dc.contributor.authorGlindemann, A.
dc.contributor.authorBeckmann, U.
dc.contributor.authorHeininger, M.
dc.contributor.authorBettonvil, F.
dc.contributor.authorBettonvil, F.
dc.contributor.authorZins, G.
dc.contributor.authorWoillez, J.
dc.contributor.authorBristow, P.
dc.contributor.authorSanchez-Bermudez, J.
dc.contributor.authorOhnaka, K.
dc.contributor.authorKraus, S.
dc.contributor.authorMehner, A.
dc.contributor.authorWittkowski, M.
dc.contributor.authorHummel, C.A.
dc.contributor.authorStee, P.
dc.contributor.authorVakili, F.
dc.contributor.authorHartman, H.
dc.contributor.authorNavarete, F.
dc.contributor.authorHamaguchi, K.
dc.contributor.authorEspinoza-Galeas, D.A.
dc.contributor.authorStevens, I.R.
dc.contributor.authorVan Boekel, R.
dc.contributor.authorWolf, S.
dc.contributor.authorHogerheijde, M.R.
dc.contributor.authorDominik, C.
dc.contributor.authorAugereau, J.-C.
dc.contributor.authorPantin, E.
dc.contributor.authorWaters, L.B.F.M.
dc.contributor.authorMeisenheimer, K.
dc.contributor.authorVarga, J.
dc.contributor.authorKlarmann, L.
dc.contributor.authorGámez Rosas, V.
dc.contributor.authorBurtscher, L.
dc.contributor.authorLeftley, J.
dc.contributor.authorIsbell, J.W.
dc.contributor.authorHocdé, V.
dc.contributor.authorYoffe, G.
dc.contributor.authorKokoulina, E.
dc.contributor.authorHron, J.
dc.contributor.authorGroh, J.
dc.contributor.authorKreplin, A.
dc.contributor.authorRivinius, Th.
dc.contributor.authorDe Wit, W.-J.
dc.contributor.authorDanchi, W.-C.
dc.contributor.authorDe Souza A., Domiciano
dc.contributor.authorDrevon, J.
dc.contributor.authorLabadie, L.
dc.contributor.authorConnot, C.
dc.contributor.authorNußbaum, E.
dc.contributor.authorLehmitz, M.
dc.contributor.authorAntonelli, P.
dc.contributor.authorGraser, U.
dc.contributor.authorLeinert, C.
dc.date.accessioned2022-06-22T15:19:21Z
dc.date.available2022-06-22T15:19:21Z
dc.date.issued2021-08
dc.descriptionIndexación Scopuses
dc.description.abstractContext. Eta Carinae is a highly eccentric, massive binary system (semimajor axis ~15.5 au) with powerful stellar winds and a phase-dependent wind-wind collision (WWC) zone. The primary star, η Car A, is a luminous blue variable (LBV); the secondary, η Car B, is a Wolf-Rayet or O star with a faster but less dense wind. Aperture-synthesis imaging allows us to study the mass loss from the enigmatic LBV η Car. Understanding LBVs is a crucial step toward improving our knowledge about massive stars and their evolution. Aims. Our aim is to study the intensity distribution and kinematics of η Car's WWC zone. Methods. Using the VLTI-MATISSE mid-infrared interferometry instrument, we perform Brα imaging of η Car's distorted wind. Results. We present the first VLTI-MATISSE aperture-synthesis images of η Car A's stellar windin several spectral channels distributed across the Brα 4.052 μm line (spectral resolving power R ~ 960). Our observations were performed close to periastron passage in February 2020 (orbital phase ~ 14.0022). The reconstructed iso-velocity images show the dependence of the primary stellar wind on wavelength or line-of-sight (LOS) velocity with a spatial resolution of 6 mas (~14 au). The radius of the faintest outer wind regions is ~26 mas (~60 au). At several negative LOS velocities, the primary stellar wind is less extended to the northwest than in other directions. This asymmetry is most likely caused by the WWC. Therefore, we see both the velocity field of the undisturbed primary wind and the WWC cavity. In continuum spectral channels, the primary star wind is more compact than in line channels. A fit of the observed continuum visibilities with the visibilities of a stellar wind CMFGEN model (CMFGEN is an atmosphere code developed to model the spectra of a variety of objects) provides a full width at half maximum fit diameter of the primary stellar wind of 2.84 ± 0.06 mas (6.54 ± 0.14 au). We comparethe derived intensity distributions with the CMFGEN stellar wind model and hydrodynamic WWC models.es
dc.identifier.citationAstronomy and Astrophysics Volume 6521 August 2021 Article number A140es
dc.identifier.doi10.1051/0004-6361/202141240
dc.identifier.issn0004-6361
dc.identifier.urihttps://repositorio.unab.cl/xmlui/handle/ria/22935
dc.language.isoenes
dc.publisherAstronomy and Astrophysicses
dc.rights.licenseAttribution 4.0 International (CC BY 4.0)
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectBinaries: generales
dc.subjectStars: individual: η Carinaees
dc.subjectStars: mass-losses
dc.subjectStars: massivees
dc.subjectStars: winds, outflowses
dc.subjectTechniques: interferometrices
dc.titleVLTI-MATISSE chromatic aperture-synthesis imaging of η Carinae's stellar wind across the Br α line: Periastron passage observations in February 2020es
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