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

Autores
Granada, Anahí; Arias, María Laura; Cidale, Lydia Sonia
Año de publicación
2010
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
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).
Facultad de Ciencias Astronómicas y Geofísicas
Instituto de Astrofísica de La Plata (CONICET- Universidad Nacional de La Plata)
Materia
Ciencias Astronómicas
Circumstellar matter
Formation
Stars: activity
Techniques: spectroscopic
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/82472
Acceder
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network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling Simultaneous k- and l-band spectroscopy of be stars: Circumstellar envelope properties from hydrogen emission linesGranada, AnahíArias, María LauraCidale, Lydia SoniaCiencias AstronómicasCircumstellar matterFormationStars: activityTechniques: spectroscopicWe 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).Facultad de Ciencias Astronómicas y GeofísicasInstituto de Astrofísica de La Plata (CONICET- Universidad Nacional de La Plata)2010-04-08info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf1983-1992http://sedici.unlp.edu.ar/handle/10915/82472enginfo:eu-repo/semantics/altIdentifier/issn/00046256info:eu-repo/semantics/altIdentifier/doi/10.1088/0004-6256/139/5/1983info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:15:31Zoai:sedici.unlp.edu.ar:10915/82472Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:15:31.356SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Simultaneous k- and l-band spectroscopy of be stars: Circumstellar envelope properties from hydrogen emission lines
title Simultaneous k- and l-band spectroscopy of be stars: Circumstellar envelope properties from hydrogen emission lines
spellingShingle Simultaneous k- and l-band spectroscopy of be stars: Circumstellar envelope properties from hydrogen emission lines
Granada, Anahí
Ciencias Astronómicas
Circumstellar matter
Formation
Stars: activity
Techniques: spectroscopic
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
dc.creator.none.fl_str_mv Granada, Anahí
Arias, María Laura
Cidale, Lydia Sonia
author Granada, Anahí
author_facet Granada, Anahí
Arias, María Laura
Cidale, Lydia Sonia
author_role author
author2 Arias, María Laura
Cidale, Lydia Sonia
author2_role author
author
dc.subject.none.fl_str_mv Ciencias Astronómicas
Circumstellar matter
Formation
Stars: activity
Techniques: spectroscopic
topic Ciencias Astronómicas
Circumstellar matter
Formation
Stars: activity
Techniques: spectroscopic
dc.description.none.fl_txt_mv 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).
Facultad de Ciencias Astronómicas y Geofísicas
Instituto de Astrofísica de La Plata (CONICET- Universidad Nacional de La Plata)
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).
publishDate 2010
dc.date.none.fl_str_mv 2010-04-08
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/82472
url http://sedici.unlp.edu.ar/handle/10915/82472
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/00046256
info:eu-repo/semantics/altIdentifier/doi/10.1088/0004-6256/139/5/1983
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
1983-1992
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution UNLP
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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score 13.070432

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