Artículo
The periodicity of the Eta Carinae events
Damineli, A.; Hillier, D. J.; Corcoran, Michael; Stahl, O.; Levenhagen, R. S.; Leister, N. V.; Groh, J. H.; Teodoro, M.; Albacete Colombo, Juan Facundo
; Gonzalez, Jorge Federico
; Arias, Julia Ines
; Levato, Orlando Hugo
; Grosso, Monica Gladys
; Morrell, Nidia Irene
; Gamen, Roberto Claudio
; Wallerstein, G.; Niemela, Virpi Sinikka
Fecha de publicación:
03/2008
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
Extensive spectral observations of η Carinae over the last cycle, and particularly around the 2003.5 low-excitation event, have been obtained. The variability of both narrow and broad lines, when combined with data taken from two earlier cycles, reveal a common and welldefined period. We have combined the cycle lengths derived from the many lines in the optical spectrum with those from broad-band X-rays, optical and near-infrared observations, and obtained a period length of Ppres = 2022.7 ± 1.3 d. Spectroscopic data collected during the last 60 yr yield an average period of Pavg = 2020 ± 4 d, consistent with the present-day period. The period cannot have changed by more than P/P = 0.0007 since 1948. This confirms the previous claims of a true, stable periodicity, and gives strong support to the binary scenario. We have used the disappearance of the narrow component of He I 6678 to define the epoch of the Cycle 11 minimum, T0 = JD 245 2819.8. The next event is predicted to occur on 2009 January 11 (±2 d). The dates for the start of the minimum in other spectral features and broad-bands are very close to this date, and have well-determined time-delays from the He I epoch.
Palabras clave:
Stars
,
Eta Carinae
,
Binary Stars
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(CCT - PATAGONIA NORTE)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Articulos(IALP)
Articulos de INST.DE ASTROFISICA LA PLATA
Articulos de INST.DE ASTROFISICA LA PLATA
Citación
Damineli, A.; Hillier, D. J.; Corcoran, Michael; Stahl, O.; Levenhagen, R. S.; et al.; The periodicity of the Eta Carinae events; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 384; 4; 3-2008; 1649-1656
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