Artículo
A multispectral view of the periodic events in Eta Carinae
Damineli, A.; Hillier, D. J.; Corcoran, Michael; Stahl, O.; Groh, J. H.; Arias, Julia Ines
; Teodoro, M.; Morrell, Nidia Irene
; Gamen, Roberto Claudio
; Gonzalez, Jorge Federico
; Leister, N. V.; Levato, Orlando Hugo
; Levenhagen, R. S.; Grosso, Monica Gladys
; Albacete Colombo, Juan Facundo
; Wallerstein, G.
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Fecha de publicación:
06/2008
Editorial:
Wiley Blackwell Publishing, Inc
Revista:
Monthly Notices of the Royal Astronomical Society
ISSN:
0035-8711
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
A full description of the 5.5-yr low excitation events in η Carinae is presented. We show that they are not as simple and brief as previously thought, but a combination of two components. The first, the slow variation component, is revealed by slow changes in the ionization level of circumstellar matter across the whole cycle and is caused by gradual changes in the wind– wind collision shock-cone orientation, angular opening and gaseous content. The second, the collapse component, is restricted to around the minimum, and is due to a temporary global collapse of the wind–wind collision shock. High-energy photons (E > 16 eV) from the companion star are strongly shielded, leaving the Weigelt objects at low-ionization state for more than six months. High-energy phenomena are sensitive only to the collapse, low energy only to the slow variation and intermediate energies to both components. Simple eclipses and mechanisms effective only near periastron (e.g. shell ejection or accretion on to the secondary star) cannot account for the whole 5.5-yr cycle. We find anti-correlated changes in the intensity and the radial velocity of P Cygni absorption profiles in Fe II λ6455 and He I λ7065 lines, indicating that the former is associated to the primary and the latter to the secondary star. We present a set of light curves representative of the whole spectrum, useful for monitoring the next event (2009 January 11).
Palabras clave:
Stars
,
Eta Carinae
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(IALP)
Articulos de INST.DE ASTROFISICA LA PLATA
Articulos de INST.DE ASTROFISICA LA PLATA
Articulos(ICATE)
Articulos de INST.D/CS ASTRONOMICAS D/LA TIERRA Y DEL ESPACIO
Articulos de INST.D/CS ASTRONOMICAS D/LA TIERRA Y DEL ESPACIO
Citación
Damineli, A.; Hillier, D. J.; Corcoran, Michael; Stahl, O.; Groh, J. H.; et al.; A multispectral view of the periodic events in Eta Carinae; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 386; 4; 6-2008; 2330-2344
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