Artículo
The H-alpha variations of Eta Carinae during the 2009.0 spectroscopic event
Fecha de publicación:
04/2010
Editorial:
Iop Publishing
Revista:
Astronomical Journal
ISSN:
0004-6256
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We report on H-alpha spectroscopy of the 2009.0 spectroscopic event of eta Carinae collected via SMARTS observations using the CTIO 1.5 m telescope and echelle spectrograph. Our observations were made almost every night over a two month interval around the predicted minimum of eta Car. We observed a significant fading of the line emission that reached a minimum seven days after the X-ray minimum. About 17 d prior to the H-alpha flux minimum, the H-alpha profile exhibited the emergence of a broad, P Cygni type, absorption component (near a Doppler shift of -500 km/s) and a narrow absorption component (near -144 km/s and probably associated with intervening gas from the Little Homunculus Nebula). All these features were observed during the last event in 2003.5 and are probably related to the close periastron passage of the companion. We argue that these variations are consistent with qualitative expectations about changes in the primary star´s stellar wind that result from the wind-wind collision with a massive binary companion and from atmospheric eclipses of the companion.
Palabras clave:
Early Type Stars
,
Eta Carinae (Estrella)
,
Star Winds
,
Outflows
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(IALP)
Articulos de INST.DE ASTROFISICA LA PLATA
Articulos de INST.DE ASTROFISICA LA PLATA
Citación
Richardson, N. D. ; Gies, D. R. ; Henry, T. J. ; Fernandez Lajus, Eduardo Eusebio; Okazaki, A. T. ; The H-alpha variations of Eta Carinae during the 2009.0 spectroscopic event; Iop Publishing; Astronomical Journal; 139; 4; 4-2010; 1534-1541
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