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dc.contributor.author
Teodoro, M  
dc.contributor.author
Damineli, A  
dc.contributor.author
Heathcote, B  
dc.contributor.author
Richardson, N. D.  
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Moffat, A. F. J.  
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St Jean, L.  
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Russell, C.  
dc.contributor.author
Gull, T. R.  
dc.contributor.author
Madura, T. I.  
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Pollard, K. R.  
dc.contributor.author
Walter, F.  
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Coimbra, A.  
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Prates, R.  
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Fernandez Lajus, Eduardo Eusebio  
dc.contributor.author
Gamen, Roberto Claudio  
dc.contributor.author
Hickel, G.  
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Henrique, W.  
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Navarete, F.  
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Andrade, T.  
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Jablonski, F.  
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Luckas, P.  
dc.contributor.author
Locke, M.  
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Powles, J.  
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Bohlsen, T.  
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Chini, R.  
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Corcoran, Michael  
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Hamaguchi, K.  
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Groh, J. H.  
dc.contributor.author
Hillier, D. J.  
dc.contributor.author
Weigelt, G.  
dc.date.available
2018-02-07T14:08:47Z  
dc.date.issued
2016-03  
dc.identifier.citation
Teodoro, M; Damineli, A; Heathcote, B; Richardson, N. D.; Moffat, A. F. J.; et al.; He II λ4686 emission from the massive binary system in η Car : constraints to the orbital elements and the nature of the periodic minima; IOP Publishing; Astrophysical Journal; 819; 2; 3-2016; 131-154  
dc.identifier.issn
0004-637X  
dc.identifier.uri
http://hdl.handle.net/11336/35934  
dc.description.abstract
Eta Carinae (η Car) is an extremely massive binary system in which rapid spectrum variations occur near periastron. Most notably, near periastron the He ii λ4686 line increases rapidly in strength, drops to a minimum value, then increases briefly before fading away. To understand this behavior, we conducted an intense spectroscopic monitoring of the He ii λ4686 emission line across the 2014.6 periastron passage using ground- and space-based telescopes. Comparison with previous data confirmed the overall repeatability of the line equivalent width (EW), radial velocities, and the timing of the minimum, though the strongest peak was systematically larger in 2014 than in 2009 by 26%. The EW variations, combined with other measurements, yield an orbital period of 2022.7 ± 0.3 days. The observed variability of the EW was reproduced by a model in which the line flux primarily arises at the apex of the wind?wind collision and scales inversely with the square of the stellar separation, if we account for the excess emission as the companion star plunges into the hot inner layers of the primary?s atmosphere, and including absorption from the disturbed primary wind between the source and the observer. This model constrains the orbital inclination to 135°?153°, and the longitude of periastron to 234°?252°. It also suggests that periastron passage occurred on {T}0=2456874.4quad (+/- 1.3 days). Our model also reproduced EW variations from a polar view of the primary star as determined from the observed He ii λ 4686 emission scattered off the Homunculus nebula.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
IOP Publishing  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
Binaries  
dc.subject
Circumstellar Matter  
dc.subject
Eta Carinae  
dc.subject
Massive Stars  
dc.subject.classification
Astronomía  
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Ciencias Físicas  
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CIENCIAS NATURALES Y EXACTAS  
dc.title
He II λ4686 emission from the massive binary system in η Car : constraints to the orbital elements and the nature of the periodic minima  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2018-01-12T19:26:23Z  
dc.journal.volume
819  
dc.journal.number
2  
dc.journal.pagination
131-154  
dc.journal.pais
Estados Unidos  
dc.description.fil
Fil: Teodoro, M. NASA Goddard Space Flight Center; Estados Unidos  
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Fil: Damineli, A. Universidade de Sao Paulo; Brasil  
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Fil: Heathcote, B. SASER Team; Australia  
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Fil: Richardson, N. D.. University of Montreal; Canadá  
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Fil: Moffat, A. F. J.. University of Montreal; Canadá  
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Fil: St Jean, L.. University of Montreal; Canadá  
dc.description.fil
Fil: Russell, C.. NASA Goddard Space Flight Center; Estados Unidos  
dc.description.fil
Fil: Gull, T. R.. NASA Goddard Space Flight Center; Estados Unidos  
dc.description.fil
Fil: Madura, T. I.. NASA Goddard Space Flight Center; Estados Unidos  
dc.description.fil
Fil: Pollard, K. R.. University Of Canterbury; Nueva Zelanda  
dc.description.fil
Fil: Walter, F.. Laboratório Nacional de Astrofíca; Brasil  
dc.description.fil
Fil: Coimbra, A.. Laboratório Nacional de Astrofíca; Brasil  
dc.description.fil
Fil: Prates, R.. Laboratório Nacional de Astrofíca; Brasil  
dc.description.fil
Fil: Fernandez Lajus, Eduardo Eusebio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica la Plata; Argentina  
dc.description.fil
Fil: Gamen, Roberto Claudio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica la Plata; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina  
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Fil: Hickel, G.. Universidade Federal de Itajubá; Brasil  
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Fil: Henrique, W.. Universidade Federal de Itajubá; Brasil  
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Fil: Navarete, F.. Universidade de Sao Paulo; Brasil  
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Fil: Andrade, T.. Universidade de Sao Paulo; Brasil  
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Fil: Jablonski, F.. Instituto Nacional de Pesquisas Espaciais; Brasil  
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Fil: Luckas, P.. SASER Team; Australia  
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Fil: Locke, M.. SASER Team; Australia  
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Fil: Powles, J.. SASER Team; Australia  
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Fil: Bohlsen, T.. SASER Team; Australia  
dc.description.fil
Fil: Chini, R.. Ruhr Universität Bochum; Alemania  
dc.description.fil
Fil: Corcoran, Michael. NASA Goddard Space Flight Center; Estados Unidos  
dc.description.fil
Fil: Hamaguchi, K.. NASA Goddard Space Flight Center; Estados Unidos  
dc.description.fil
Fil: Groh, J. H.. Geneva Observatory; Suiza  
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Fil: Hillier, D. J.. University of Pittsburgh; Estados Unidos  
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Fil: Weigelt, G.. Max Planck Institut für Radioastronomie; Alemania  
dc.journal.title
Astrophysical Journal  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://adsabs.harvard.edu/abs/2016ApJ...819..131T  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.3847/0004-637X/819/2/131