The Hα variations of η Carinae during the 2009.0 spectroscopic event

We report on Hα spectroscopy of the 2009.0 spectroscopic event of η Carinae collected via SMARTS observations using the Cerro Tololo Interamerican Observatory 1.5 m telescope and echelle spectrograph. Our observations were made almost every night over a two-month interval around the predicted minimu...

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Detalles Bibliográficos
Autores principales: Richardson, N. D., Gies, D. R., Henry, T. J., Fernández Lajús, Eduardo, Okazaki, A. T.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2010
Materias:
Ciencias Astronómicas
Stars: early-type
Stars: individual (eta Carinae)
Stars: winds, outflows
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/82519
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-82519
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
Stars: early-type
Stars: individual (eta Carinae)
Stars: winds, outflows
spellingShingle Ciencias Astronómicas
Stars: early-type
Stars: individual (eta Carinae)
Stars: winds, outflows
Richardson, N. D.
Gies, D. R.
Henry, T. J.
Fernández Lajús, Eduardo
Okazaki, A. T.
The Hα variations of η Carinae during the 2009.0 spectroscopic event
topic_facet Ciencias Astronómicas
Stars: early-type
Stars: individual (eta Carinae)
Stars: winds, outflows
description We report on Hα spectroscopy of the 2009.0 spectroscopic event of η Carinae collected via SMARTS observations using the Cerro Tololo Interamerican Observatory 1.5 m telescope and echelle spectrograph. Our observations were made almost every night over a two-month interval around the predicted minimum of η Car. We observed a significant fading of the line emission that reached a minimum 7 days after the X-ray minimum. About 17 days prior to the Hα flux minimum, the Hα profile exhibited the emergence of a broad, P Cygni type, absorption component (near a Doppler shift of -500 km s<SUP>-1</SUP>) and a narrow absorption component (near -144 km s<SUP>-1</SUP> 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.
format Articulo
Articulo
author Richardson, N. D.
Gies, D. R.
Henry, T. J.
Fernández Lajús, Eduardo
Okazaki, A. T.
author_facet Richardson, N. D.
Gies, D. R.
Henry, T. J.
Fernández Lajús, Eduardo
Okazaki, A. T.
author_sort Richardson, N. D.
title The Hα variations of η Carinae during the 2009.0 spectroscopic event
title_short The Hα variations of η Carinae during the 2009.0 spectroscopic event
title_full The Hα variations of η Carinae during the 2009.0 spectroscopic event
title_fullStr The Hα variations of η Carinae during the 2009.0 spectroscopic event
title_full_unstemmed The Hα variations of η Carinae during the 2009.0 spectroscopic event
title_sort hα variations of η carinae during the 2009.0 spectroscopic event
publishDate 2010
url http://sedici.unlp.edu.ar/handle/10915/82519
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