Simultaneous k- and l-band spectroscopy of be stars: Circumstellar envelope properties from hydrogen emission lines

We present medium-resolution K- and L-band spectra of a sample of eight Be stars, obtained with Gemini/NIRI. The IR K and L bands contain many lines of different hydrogen series that are used as a diagnosis to the physical conditions in the circumstellar environments. We make an analysis on the opti...

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Autores principales: Granada, Anahí, Arias, María Laura, Cidale, Lydia Sonia
Formato: Articulo
Lenguaje:Inglés
Publicado: 2010
Materias:
Ciencias Astronómicas
Circumstellar matter
Formation
Stars: activity
Techniques: spectroscopic
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/82472
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-82472
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
Circumstellar matter
Formation
Stars: activity
Techniques: spectroscopic
spellingShingle Ciencias Astronómicas
Circumstellar matter
Formation
Stars: activity
Techniques: spectroscopic
Granada, Anahí
Arias, María Laura
Cidale, Lydia Sonia
Simultaneous k- and l-band spectroscopy of be stars: Circumstellar envelope properties from hydrogen emission lines
topic_facet Ciencias Astronómicas
Circumstellar matter
Formation
Stars: activity
Techniques: spectroscopic
description We present medium-resolution K- and L-band spectra of a sample of eight Be stars, obtained with Gemini/NIRI. The IR K and L bands contain many lines of different hydrogen series that are used as a diagnosis to the physical conditions in the circumstellar environments. We make an analysis on the optical depths of the line-forming regions based on the intensity ratios of Pfγ and Brα lines, the behavior of Humphreys' series, and the fluxes of Brα and Brγ lines. All our targets show spectroscopic and photometric long-term variability; thus, time-resolved K- and L-band spectroscopy is an ideal tool for studying the structure and evolution of the innermost regions of the envelope and to test models on the disk-forming mechanism. We note that the instrumental configuration used allowed us to obtain good quality IR observations and to take profit of Gemini band 3 observing time (allocation time for ranked programs in which the observing conditions are relaxed).
format Articulo
Articulo
author Granada, Anahí
Arias, María Laura
Cidale, Lydia Sonia
author_facet Granada, Anahí
Arias, María Laura
Cidale, Lydia Sonia
author_sort Granada, Anahí
title Simultaneous k- and l-band spectroscopy of be stars: Circumstellar envelope properties from hydrogen emission lines
title_short Simultaneous k- and l-band spectroscopy of be stars: Circumstellar envelope properties from hydrogen emission lines
title_full Simultaneous k- and l-band spectroscopy of be stars: Circumstellar envelope properties from hydrogen emission lines
title_fullStr Simultaneous k- and l-band spectroscopy of be stars: Circumstellar envelope properties from hydrogen emission lines
title_full_unstemmed Simultaneous k- and l-band spectroscopy of be stars: Circumstellar envelope properties from hydrogen emission lines
title_sort simultaneous k- and l-band spectroscopy of be stars: circumstellar envelope properties from hydrogen emission lines
publishDate 2010
url http://sedici.unlp.edu.ar/handle/10915/82472
work_keys_str_mv AT granadaanahi simultaneouskandlbandspectroscopyofbestarscircumstellarenvelopepropertiesfromhydrogenemissionlines
AT ariasmarialaura simultaneouskandlbandspectroscopyofbestarscircumstellarenvelopepropertiesfromhydrogenemissionlines
AT cidalelydiasonia simultaneouskandlbandspectroscopyofbestarscircumstellarenvelopepropertiesfromhydrogenemissionlines
bdutipo_str Repositorios
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