He II λ4686 emission from the massive binary system in η car: constraints to the orbital elements and the nature of the periodic minima

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 c...

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Detalles Bibliográficos
Autores principales: Teodoro, M., Damineli, A., Heathcote, B., Richardson, N. D., Moffat, A. F. J., St-Jean, L., Russell, C., Gull, T. R., Madura, T. I., Pollard, K. R., Walter, F., Coimbra, A., Prates, R., Fernández Lajús, Eduardo, Gamen, Roberto Claudio, Hickel, G., Henrique, W., Navarete, F., Andrade, T., Jablonski. F., Luckas, P., Locke, M., Powles, J., Bohlsen, T., Chini, R., Corcoran, M. F., Hamaguchi, K., Groh, J. H., Hillier, D. J., Weigelt, G.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2016
Materias:
Ciencias Astronómicas
binaries: general
circumstellar matter
stars: individual (νCarinae)
stars: massive
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/86905
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-86905
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
binaries: general
circumstellar matter
stars: individual (νCarinae)
stars: massive
spellingShingle Ciencias Astronómicas
binaries: general
circumstellar matter
stars: individual (νCarinae)
stars: massive
Teodoro, M.
Damineli, A.
Heathcote, B.
Richardson, N. D.
Moffat, A. F. J.
St-Jean, L.
Russell, C.
Gull, T. R.
Madura, T. I.
Pollard, K. R.
Walter, F.
Coimbra, A.
Prates, R.
Fernández Lajús, Eduardo
Gamen, Roberto Claudio
Hickel, G.
Henrique, W.
Navarete, F.
Andrade, T.
Jablonski. F.
Luckas, P.
Locke, M.
Powles, J.
Bohlsen, T.
Chini, R.
Corcoran, M. F.
Hamaguchi, K.
Groh, J. H.
Hillier, D. J.
Weigelt, G.
He II λ4686 emission from the massive binary system in η car: constraints to the orbital elements and the nature of the periodic minima
topic_facet Ciencias Astronómicas
binaries: general
circumstellar matter
stars: individual (νCarinae)
stars: massive
description 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 days). Our model also reproduced EW variations from a polar view of the primary star as determined from the observed He ii λ4686 emission scattered off the Homunculus nebula.
format Articulo
Articulo
author Teodoro, M.
Damineli, A.
Heathcote, B.
Richardson, N. D.
Moffat, A. F. J.
St-Jean, L.
Russell, C.
Gull, T. R.
Madura, T. I.
Pollard, K. R.
Walter, F.
Coimbra, A.
Prates, R.
Fernández Lajús, Eduardo
Gamen, Roberto Claudio
Hickel, G.
Henrique, W.
Navarete, F.
Andrade, T.
Jablonski. F.
Luckas, P.
Locke, M.
Powles, J.
Bohlsen, T.
Chini, R.
Corcoran, M. F.
Hamaguchi, K.
Groh, J. H.
Hillier, D. J.
Weigelt, G.
author_facet Teodoro, M.
Damineli, A.
Heathcote, B.
Richardson, N. D.
Moffat, A. F. J.
St-Jean, L.
Russell, C.
Gull, T. R.
Madura, T. I.
Pollard, K. R.
Walter, F.
Coimbra, A.
Prates, R.
Fernández Lajús, Eduardo
Gamen, Roberto Claudio
Hickel, G.
Henrique, W.
Navarete, F.
Andrade, T.
Jablonski. F.
Luckas, P.
Locke, M.
Powles, J.
Bohlsen, T.
Chini, R.
Corcoran, M. F.
Hamaguchi, K.
Groh, J. H.
Hillier, D. J.
Weigelt, G.
author_sort Teodoro, M.
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
title_short He II λ4686 emission from the massive binary system in η car: constraints to the orbital elements and the nature of the periodic minima
title_full He II λ4686 emission from the massive binary system in η car: constraints to the orbital elements and the nature of the periodic minima
title_fullStr He II λ4686 emission from the massive binary system in η car: constraints to the orbital elements and the nature of the periodic minima
title_full_unstemmed He II λ4686 emission from the massive binary system in η car: constraints to the orbital elements and the nature of the periodic minima
title_sort he ii λ4686 emission from the massive binary system in η car: constraints to the orbital elements and the nature of the periodic minima
publishDate 2016
url http://sedici.unlp.edu.ar/handle/10915/86905
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