BCD spectrophotometry of stars with the B[e] phenomenon : I. Fundamental Parameters

Autores
Cidale, Lydia Sonia; Zorec, Juan; Tringaniello, María Luján Ramona
Año de publicación
2001
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Low resolution spectra in the λλ3500-4600 Å wavelength range of 23 stars with the B[e] phenomenon are presented. Spectral classification of 15 program stars was performed using the BCD spectrophotometric system, based on the study of the Balmer discontinuity, which is independent of interstellar and circumstellar dust extinctions and of circumstellar gas emissions and/or absorptions. From calibrations of the BCD parameters we determined the of the studied stars. For stars where this method could not be applied, we tried to estimate the temperature of the central star by using the Balmer and He I emission lines and/or their visible energy distribution. The colour temperature and the temperatures obtained from the study of Balmer and He I lines are consistent with each other. The new results are compared with those obtained previously by other authors and discussed for each star individually. For some stars, differences between the effective temperatures derived using the BCD classification system and those obtained elsewhere, based on photometric or spectroscopic analysis, imply spectral-type classification disagreements ranging from 2-3 up to 6 B sub-spectral types. The fundamental parameters of AS 119, CD-245721, Hen2-91, HD 316375 and BD-114747 were determined for the first time. A simple method was introduced to calculate total (interstellar+circumstellar) dust extinction towards the studied stars. For HD 53179, which is a double stellar system, and for HD 45677 and HD 50138, which are suspected to be binaries, we predicted the characteristics of the components that are consistent with the observed parameters. However, the possible binarity of HD 45677 and HD 50138 still needs to be confirmed spectroscopically.
Facultad de Ciencias Astronómicas y Geofísicas
Materia
Ciencias Astronómicas
Geofísica, astronomía y astrofísica
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-nd/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/2082

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spelling BCD spectrophotometry of stars with the B[e] phenomenon : I. Fundamental ParametersCidale, Lydia SoniaZorec, JuanTringaniello, María Luján RamonaCiencias AstronómicasGeofísica, astronomía y astrofísicaLow resolution spectra in the λλ3500-4600 Å wavelength range of 23 stars with the B[e] phenomenon are presented. Spectral classification of 15 program stars was performed using the BCD spectrophotometric system, based on the study of the Balmer discontinuity, which is independent of interstellar and circumstellar dust extinctions and of circumstellar gas emissions and/or absorptions. From calibrations of the BCD parameters we determined the of the studied stars. For stars where this method could not be applied, we tried to estimate the temperature of the central star by using the Balmer and He I emission lines and/or their visible energy distribution. The colour temperature and the temperatures obtained from the study of Balmer and He I lines are consistent with each other. The new results are compared with those obtained previously by other authors and discussed for each star individually. For some stars, differences between the effective temperatures derived using the BCD classification system and those obtained elsewhere, based on photometric or spectroscopic analysis, imply spectral-type classification disagreements ranging from 2-3 up to 6 B sub-spectral types. The fundamental parameters of AS 119, CD-245721, Hen2-91, HD 316375 and BD-114747 were determined for the first time. A simple method was introduced to calculate total (interstellar+circumstellar) dust extinction towards the studied stars. For HD 53179, which is a double stellar system, and for HD 45677 and HD 50138, which are suspected to be binaries, we predicted the characteristics of the components that are consistent with the observed parameters. However, the possible binarity of HD 45677 and HD 50138 still needs to be confirmed spectroscopically.Facultad de Ciencias Astronómicas y Geofísicas2001info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf160-174http://sedici.unlp.edu.ar/handle/10915/2082enginfo:eu-repo/semantics/altIdentifier/url/http://www.aanda.org/index.php?option=com_article&access=standard&Itemid=129&url=/articles/aa/full/2001/10/aa10323/aa10323.htmlinfo:eu-repo/semantics/altIdentifier/issn/1432-0746info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361:20000409info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-nd/4.0/Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T10:48:37Zoai:sedici.unlp.edu.ar:10915/2082Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 10:48:38.987SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv BCD spectrophotometry of stars with the B[e] phenomenon : I. Fundamental Parameters
title BCD spectrophotometry of stars with the B[e] phenomenon : I. Fundamental Parameters
spellingShingle BCD spectrophotometry of stars with the B[e] phenomenon : I. Fundamental Parameters
Cidale, Lydia Sonia
Ciencias Astronómicas
Geofísica, astronomía y astrofísica
title_short BCD spectrophotometry of stars with the B[e] phenomenon : I. Fundamental Parameters
title_full BCD spectrophotometry of stars with the B[e] phenomenon : I. Fundamental Parameters
title_fullStr BCD spectrophotometry of stars with the B[e] phenomenon : I. Fundamental Parameters
title_full_unstemmed BCD spectrophotometry of stars with the B[e] phenomenon : I. Fundamental Parameters
title_sort BCD spectrophotometry of stars with the B[e] phenomenon : I. Fundamental Parameters
dc.creator.none.fl_str_mv Cidale, Lydia Sonia
Zorec, Juan
Tringaniello, María Luján Ramona
author Cidale, Lydia Sonia
author_facet Cidale, Lydia Sonia
Zorec, Juan
Tringaniello, María Luján Ramona
author_role author
author2 Zorec, Juan
Tringaniello, María Luján Ramona
author2_role author
author
dc.subject.none.fl_str_mv Ciencias Astronómicas
Geofísica, astronomía y astrofísica
topic Ciencias Astronómicas
Geofísica, astronomía y astrofísica
dc.description.none.fl_txt_mv Low resolution spectra in the λλ3500-4600 Å wavelength range of 23 stars with the B[e] phenomenon are presented. Spectral classification of 15 program stars was performed using the BCD spectrophotometric system, based on the study of the Balmer discontinuity, which is independent of interstellar and circumstellar dust extinctions and of circumstellar gas emissions and/or absorptions. From calibrations of the BCD parameters we determined the of the studied stars. For stars where this method could not be applied, we tried to estimate the temperature of the central star by using the Balmer and He I emission lines and/or their visible energy distribution. The colour temperature and the temperatures obtained from the study of Balmer and He I lines are consistent with each other. The new results are compared with those obtained previously by other authors and discussed for each star individually. For some stars, differences between the effective temperatures derived using the BCD classification system and those obtained elsewhere, based on photometric or spectroscopic analysis, imply spectral-type classification disagreements ranging from 2-3 up to 6 B sub-spectral types. The fundamental parameters of AS 119, CD-245721, Hen2-91, HD 316375 and BD-114747 were determined for the first time. A simple method was introduced to calculate total (interstellar+circumstellar) dust extinction towards the studied stars. For HD 53179, which is a double stellar system, and for HD 45677 and HD 50138, which are suspected to be binaries, we predicted the characteristics of the components that are consistent with the observed parameters. However, the possible binarity of HD 45677 and HD 50138 still needs to be confirmed spectroscopically.
Facultad de Ciencias Astronómicas y Geofísicas
description Low resolution spectra in the λλ3500-4600 Å wavelength range of 23 stars with the B[e] phenomenon are presented. Spectral classification of 15 program stars was performed using the BCD spectrophotometric system, based on the study of the Balmer discontinuity, which is independent of interstellar and circumstellar dust extinctions and of circumstellar gas emissions and/or absorptions. From calibrations of the BCD parameters we determined the of the studied stars. For stars where this method could not be applied, we tried to estimate the temperature of the central star by using the Balmer and He I emission lines and/or their visible energy distribution. The colour temperature and the temperatures obtained from the study of Balmer and He I lines are consistent with each other. The new results are compared with those obtained previously by other authors and discussed for each star individually. For some stars, differences between the effective temperatures derived using the BCD classification system and those obtained elsewhere, based on photometric or spectroscopic analysis, imply spectral-type classification disagreements ranging from 2-3 up to 6 B sub-spectral types. The fundamental parameters of AS 119, CD-245721, Hen2-91, HD 316375 and BD-114747 were determined for the first time. A simple method was introduced to calculate total (interstellar+circumstellar) dust extinction towards the studied stars. For HD 53179, which is a double stellar system, and for HD 45677 and HD 50138, which are suspected to be binaries, we predicted the characteristics of the components that are consistent with the observed parameters. However, the possible binarity of HD 45677 and HD 50138 still needs to be confirmed spectroscopically.
publishDate 2001
dc.date.none.fl_str_mv 2001
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format article
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url http://sedici.unlp.edu.ar/handle/10915/2082
dc.language.none.fl_str_mv eng
language eng
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info:eu-repo/semantics/altIdentifier/issn/1432-0746
info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361:20000409
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
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repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
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