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dc.contributor.authorSanchez-Bermudez, J
dc.contributor.authorWeigelt, G
dc.contributor.authorBestenlehner, JM
dc.contributor.authorKervella, P
dc.contributor.authorBrandner, W
dc.contributor.authorHenning, T
dc.contributor.authorMüller, A
dc.contributor.authorPerrin, G
dc.contributor.authorPott, JU
dc.contributor.authorSchöller, M
dc.contributor.authorVan Boekel, R
dc.contributor.authorAbuter, R
dc.contributor.authorAccardo, M
dc.contributor.authorAmorim, A
dc.contributor.authorAnugu, N
dc.contributor.authorÁvila, G
dc.contributor.authorBenisty, M
dc.contributor.authorBerger, JP
dc.contributor.authorBlind, N
dc.contributor.authorBonnet, H
dc.contributor.authorBourget, P
dc.contributor.authorBrast, R
dc.contributor.authorBuron, A
dc.contributor.authorCantalloube, F
dc.contributor.authorCaratti Garatti, AO
dc.contributor.authorCassaing, F
dc.contributor.authorChapron, F
dc.contributor.authorChoquet, E
dc.contributor.authorClénet, Y
dc.contributor.authorCollin, C
dc.contributor.authorCoudé Du Foresto, V
dc.contributor.authorDe Wit, W
dc.contributor.authorDe Zeeuw, T
dc.contributor.authorDeen, C
dc.contributor.authorDelplancke-Ströbele, F
dc.contributor.authorDembet, R
dc.contributor.authorDerie, F
dc.contributor.authorDexter, J
dc.contributor.authorDuvert, G
dc.contributor.authorEbert, M
dc.contributor.authorEckart, A
dc.contributor.authorEisenhauer, F
dc.contributor.authorEsselborn, M
dc.contributor.authorFédou, P
dc.contributor.authorGarcia, PJV
dc.contributor.authorGarcia Dabo, CE
dc.contributor.authorGarcia Lopez, R
dc.contributor.authorGao, F
dc.contributor.authorGendron, E
dc.contributor.authorGenzel, R
dc.contributor.authorGillessen, S
dc.contributor.authorHaubois, X
dc.contributor.authorHaug, M
dc.contributor.authorHaussmann, F
dc.contributor.authorHippler, S
dc.contributor.authorHorrobin, M
dc.contributor.authorHuber, A
dc.contributor.authorHubert, Z
dc.contributor.authorHubin, N
dc.contributor.authorHummel, CA
dc.contributor.authorJakob, G
dc.contributor.authorJochum, L
dc.contributor.authorJocou, L
dc.contributor.authorKarl, M
dc.contributor.authorKaufer, A
dc.contributor.authorKellner, S
dc.contributor.authorKendrew, S
dc.contributor.authorKern, L
dc.contributor.authorKiekebusch, M
dc.contributor.authorKlein, R
dc.contributor.authorKolb, J
dc.contributor.authorKulas, M
dc.contributor.authorLacour, S
dc.contributor.authorLapeyrère, V
dc.contributor.authorLazareff, B
dc.contributor.authorLe Bouquin, JB
dc.contributor.authorLéna, P
dc.contributor.authorLenzen, R
dc.contributor.authorLévêque, S
dc.contributor.authorLippa, M
dc.contributor.authorMagnard, Y
dc.contributor.authorMehrgan, L
dc.contributor.authorMellein, M
dc.contributor.authorMérand, A
dc.contributor.authorMoreno-Ventas, J
dc.contributor.authorMoulin, T
dc.contributor.authorMüller, E
dc.contributor.authorMüller, F
dc.contributor.authorNeumann, U
dc.contributor.authorOberti, S
dc.contributor.authorOtt, T
dc.contributor.authorPallanca, L
dc.contributor.authorPanduro, J
dc.contributor.authorPasquini, L
dc.contributor.authorPaumard, T
dc.contributor.authorPopovic, D
dc.contributor.authorRabien, S
dc.contributor.authorRamirez, A
dc.contributor.authorRamos, J
dc.contributor.authorRau, C
dc.contributor.authorRiquelme, M
dc.contributor.authorRodríguez-Coira, G
dc.contributor.authorRohloff, R-R
dc.contributor.authorRosales, A
dc.contributor.authorRousset, G
dc.contributor.authorScheithauer, S
dc.contributor.authorSchuhler, N
dc.contributor.authorSpyromilio, J
dc.contributor.authorStraub, O
dc.contributor.authorStraubmeier, C
dc.contributor.authorSturm, E
dc.contributor.authorSuarez, M
dc.contributor.authorTristram, KRW
dc.contributor.authorVentura, N
dc.contributor.authorVincent, F
dc.contributor.authorWaisberg, I
dc.contributor.authorWank, I
dc.contributor.authorWidmann, F
dc.contributor.authorWieprecht, E
dc.contributor.authorWiest, M
dc.contributor.authorWiezorrek, E
dc.contributor.authorWittkowski, M
dc.contributor.authorWoillez, J
dc.contributor.authorWolff, B
dc.contributor.authorYazici, S
dc.contributor.authorZiegler, D
dc.contributor.authorZins, G
dc.date.accessioned2019-01-23T12:23:03Z
dc.date.issued2018-10-23
dc.description.abstractContext. η Car is one of the most intriguing luminous blue variables in the Galaxy. Observations and models of the X-ray, ultraviolet, optical, and infrared emission suggest a central binary in a highly eccentric orbit with a 5.54 yr period residing in its core. 2D and 3D radiative transfer and hydrodynamic simulations predict a primary with a dense and slow stellar wind that interacts with the faster and lower density wind of the secondary. The wind-wind collision scenario suggests that the secondary's wind penetrates the primary's wind creating a low-density cavity in it, with dense walls where the two winds interact. However, the morphology of the cavity and its physical properties are not yet fully constrained. Aims. We aim to trace the inner ∼5-50 au structure of η Car's wind-wind interaction, as seen through Brγ and, for the first time, through the He I 2s-2p line. Methods. We have used spectro-interferometric observations with the K-band beam-combiner GRAVITY at the VLTI. The analyses of the data include (i) parametrical model-fitting to the interferometric observables, (ii) a CMFGEN model of the source's spectrum, and (iii) interferometric image reconstruction. Results. Our geometrical modeling of the continuum data allows us to estimate its FWHM angular size close to 2 mas and an elongation ratio = 1.06 ± 0.05 over a PA = 130° ± 20°. Our CMFGEN modeling of the spectrum helped us to confirm that the role of the secondary should be taken into account to properly reproduce the observed Brγ and He I lines. Chromatic images across the Brγ line reveal a southeast arc-like feature, possibly associated to the hot post-shocked winds flowing along the cavity wall. The images of the He I 2s-2p line served to constrain the 20 mas (∼50 au) structure of the line-emitting region. The observed morphology of He I suggests that the secondary is responsible for the ionized material that produces the line profile. Both the Brγ and the He 2s-2p maps are consistent with previous hydrodynamical models of the colliding wind scenario. Future dedicated simulations together with an extensive interferometric campaign are necessary to refine our constraints on the wind and stellar parameters of the binary, which finally will help us predict the evolutionary path of η Car.en_GB
dc.description.sponsorshipAlexander von Humboldt Foundationen_GB
dc.description.sponsorshipESO Fellowship programen_GB
dc.description.sponsorshipDeutsche Forschungsgemeinschaft priority program 1992en_GB
dc.description.sponsorshipFundação para a Ciência e a Tecnologia (FCT)en_GB
dc.description.sponsorshipEuropean Commissionen_GB
dc.identifier.citationVol. 618, article A125en_GB
dc.identifier.doi10.1051/0004-6361/201832977
dc.identifier.grantnumberESP 1188300 HFST-Pen_GB
dc.identifier.grantnumberSFRH/BD/52066/2012en_GB
dc.identifier.grantnumberPTDC/CTE-AST/116561/2010en_GB
dc.identifier.grantnumberUID/FIS/00099/2013en_GB
dc.identifier.grantnumber312430en_GB
dc.identifier.urihttp://hdl.handle.net/10871/35575
dc.language.isoenen_GB
dc.publisherEDP Sciences for European Southern Observatory (ESO)en_GB
dc.rights© 2018 ESOen_GB
dc.subjectinstrumentation: interferometersen_GB
dc.subjectinstrumentation: high angular resolutionen_GB
dc.subjectstars: mass-lossen_GB
dc.subjectstars: massiveen_GB
dc.subjectstars: imagingen_GB
dc.subjectbinaries: generalen_GB
dc.titleGRAVITY chromatic imaging of η Car's core: Milliarcsecond resolution imaging of the wind-wind collision zone (Br γ, He I)en_GB
dc.typeArticleen_GB
dc.date.available2019-01-23T12:23:03Z
dc.identifier.issn0004-6361
dc.descriptionThis is the final version. Available from EDP Sciences via the DOI in this recorden_GB
dc.identifier.journalAstronomy and Astrophysicsen_GB
dc.rights.urihttp://www.rioxx.net/licenses/all-rights-reserveden_GB
dcterms.dateAccepted2018-07-16
rioxxterms.versionVoRen_GB
rioxxterms.licenseref.startdate2018-10-01
rioxxterms.typeJournal Article/Reviewen_GB
refterms.dateFCD2019-01-23T12:18:00Z
refterms.versionFCDVoR
refterms.dateFOA2019-01-23T12:23:06Z
refterms.panelBen_GB


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