The circumstellar environment of the star V923 Aquilae

V923 Aquilae is a Be shell star that displays emission in Hα, cyclic V/R variations and variations in the intensity of the near infrared continuum. The star presents radial velocity variations arising from a superposition of a long-term cycle and an orbital motion with a period of 214.756 days (Koub...

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Detalles Bibliográficos
Autores principales:	Arias, María Laura, Cidale, Lydia Sonia, Ringuelet, Adela Emilia
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	2004
Materias:	Ciencias Astronómicas Stars: circumstellar matter Stars: emission-line, Be
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/83530
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-83530
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: circumstellar matter Stars: emission-line, Be
spellingShingle	Ciencias Astronómicas Stars: circumstellar matter Stars: emission-line, Be Arias, María Laura Cidale, Lydia Sonia Ringuelet, Adela Emilia The circumstellar environment of the star V923 Aquilae
topic_facet	Ciencias Astronómicas Stars: circumstellar matter Stars: emission-line, Be
description	V923 Aquilae is a Be shell star that displays emission in Hα, cyclic V/R variations and variations in the intensity of the near infrared continuum. The star presents radial velocity variations arising from a superposition of a long-term cycle and an orbital motion with a period of 214.756 days (Koubský et al. 1989). To investigate the physical properties and the geometry of the circumstellar envelope of this star, we have analysed its spectra in the UV and visual range. We have selected Fe II lines to derive temperatures and location of the line-forming regions. Our results indicate that the dimensions of the circumstellar envelope vary with time and this variation correlates with the orbital period of 214.75 days. On the other hand, we determined a period of 6.8 years for V/R cyclic variations in Hα. This period is in accordance with the long-term cycle in the radial velocity and U band photometric observations. We suggest that the V/R variability in the Hα line is linked to the behavior of the subsonic wind structure.
format	Articulo Articulo
author	Arias, María Laura Cidale, Lydia Sonia Ringuelet, Adela Emilia
author_facet	Arias, María Laura Cidale, Lydia Sonia Ringuelet, Adela Emilia
author_sort	Arias, María Laura
title	The circumstellar environment of the star V923 Aquilae
title_short	The circumstellar environment of the star V923 Aquilae
title_full	The circumstellar environment of the star V923 Aquilae
title_fullStr	The circumstellar environment of the star V923 Aquilae
title_full_unstemmed	The circumstellar environment of the star V923 Aquilae
title_sort	circumstellar environment of the star v923 aquilae
publishDate	2004
url	http://sedici.unlp.edu.ar/handle/10915/83530
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bdutipo_str	Repositorios
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The circumstellar environment of the star V923 Aquilae

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