Discovery of Raman-scattered lines in the massive luminous emission-line: Star LHA 115-S 18

Autores
Torres, Andrea Fabiana; Kraus, M.; Cidale, Lydia Sonia; Barbá, Rodolfo Héctor; Borges Fernandes, M.; Brandi, Estela
Año de publicación
2012
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
LHA 115-S 18 is a very peculiar emission-line star exhibiting the B[e] phenomenon. Located in the Small Magellanic Cloud, its spectrum shows features of an extremely wide range of excitation and ionization stages, extending from highly ionized atomic lines (Si IV, CIV, HeII) in the ultraviolet and optical regions to molecular emission bands of CO and TiO in the optical and infrared regions. The most distinguishing spectral characteristic of LHA 115-S 18 is the high variability detected in the He II λ4686 emission line, which can be a very conspicuous or completely invisible feature. In thiswork,we report on another peculiarity ofLHA115-S 18. From high-resolution optical spectra taken between 2000 and 2008, we discovered the appearance and strengthening of two emission features at λλ6825 and 7082Å, which we have identified as Raman-scattered lines. This is the first time that these lines have been detected in the spectrum of a massive luminous B[e] star. As the classification of LHA 115-S 18 is highly controversial, we discuss how the discovery of the appearance of Raman-scattered lines in this peculiar star might help us to solve this puzzle.
Facultad de Ciencias Astronómicas y Geofísicas
Materia
Ciencias Astronómicas
Circumstellar matter
Stars: individual: lha 115-S 18
Stars: massive
Stars: peculiar
Supergiants
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:10915/84551
Acceder
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oai_identifier_str oai:sedici.unlp.edu.ar:10915/84551
network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling Discovery of Raman-scattered lines in the massive luminous emission-line: Star LHA 115-S 18Torres, Andrea FabianaKraus, M.Cidale, Lydia SoniaBarbá, Rodolfo HéctorBorges Fernandes, M.Brandi, EstelaCiencias AstronómicasCircumstellar matterStars: individual: lha 115-S 18Stars: massiveStars: peculiarSupergiantsLHA 115-S 18 is a very peculiar emission-line star exhibiting the B[e] phenomenon. Located in the Small Magellanic Cloud, its spectrum shows features of an extremely wide range of excitation and ionization stages, extending from highly ionized atomic lines (Si IV, CIV, HeII) in the ultraviolet and optical regions to molecular emission bands of CO and TiO in the optical and infrared regions. The most distinguishing spectral characteristic of LHA 115-S 18 is the high variability detected in the He II λ4686 emission line, which can be a very conspicuous or completely invisible feature. In thiswork,we report on another peculiarity ofLHA115-S 18. From high-resolution optical spectra taken between 2000 and 2008, we discovered the appearance and strengthening of two emission features at λλ6825 and 7082Å, which we have identified as Raman-scattered lines. This is the first time that these lines have been detected in the spectrum of a massive luminous B[e] star. As the classification of LHA 115-S 18 is highly controversial, we discuss how the discovery of the appearance of Raman-scattered lines in this peculiar star might help us to solve this puzzle.Facultad de Ciencias Astronómicas y Geofísicas2012-11info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfL80-L84http://sedici.unlp.edu.ar/handle/10915/84551enginfo:eu-repo/semantics/altIdentifier/issn/1745-3933info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1745-3933.2012.01349.xinfo: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:UNLP2025-10-22T16:56:52Zoai:sedici.unlp.edu.ar:10915/84551Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-10-22 16:56:52.303SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Discovery of Raman-scattered lines in the massive luminous emission-line: Star LHA 115-S 18
title Discovery of Raman-scattered lines in the massive luminous emission-line: Star LHA 115-S 18
spellingShingle Discovery of Raman-scattered lines in the massive luminous emission-line: Star LHA 115-S 18
Torres, Andrea Fabiana
Ciencias Astronómicas
Circumstellar matter
Stars: individual: lha 115-S 18
Stars: massive
Stars: peculiar
Supergiants
title_short Discovery of Raman-scattered lines in the massive luminous emission-line: Star LHA 115-S 18
title_full Discovery of Raman-scattered lines in the massive luminous emission-line: Star LHA 115-S 18
title_fullStr Discovery of Raman-scattered lines in the massive luminous emission-line: Star LHA 115-S 18
title_full_unstemmed Discovery of Raman-scattered lines in the massive luminous emission-line: Star LHA 115-S 18
title_sort Discovery of Raman-scattered lines in the massive luminous emission-line: Star LHA 115-S 18
dc.creator.none.fl_str_mv Torres, Andrea Fabiana
Kraus, M.
Cidale, Lydia Sonia
Barbá, Rodolfo Héctor
Borges Fernandes, M.
Brandi, Estela
author Torres, Andrea Fabiana
author_facet Torres, Andrea Fabiana
Kraus, M.
Cidale, Lydia Sonia
Barbá, Rodolfo Héctor
Borges Fernandes, M.
Brandi, Estela
author_role author
author2 Kraus, M.
Cidale, Lydia Sonia
Barbá, Rodolfo Héctor
Borges Fernandes, M.
Brandi, Estela
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Ciencias Astronómicas
Circumstellar matter
Stars: individual: lha 115-S 18
Stars: massive
Stars: peculiar
Supergiants
topic Ciencias Astronómicas
Circumstellar matter
Stars: individual: lha 115-S 18
Stars: massive
Stars: peculiar
Supergiants
dc.description.none.fl_txt_mv LHA 115-S 18 is a very peculiar emission-line star exhibiting the B[e] phenomenon. Located in the Small Magellanic Cloud, its spectrum shows features of an extremely wide range of excitation and ionization stages, extending from highly ionized atomic lines (Si IV, CIV, HeII) in the ultraviolet and optical regions to molecular emission bands of CO and TiO in the optical and infrared regions. The most distinguishing spectral characteristic of LHA 115-S 18 is the high variability detected in the He II λ4686 emission line, which can be a very conspicuous or completely invisible feature. In thiswork,we report on another peculiarity ofLHA115-S 18. From high-resolution optical spectra taken between 2000 and 2008, we discovered the appearance and strengthening of two emission features at λλ6825 and 7082Å, which we have identified as Raman-scattered lines. This is the first time that these lines have been detected in the spectrum of a massive luminous B[e] star. As the classification of LHA 115-S 18 is highly controversial, we discuss how the discovery of the appearance of Raman-scattered lines in this peculiar star might help us to solve this puzzle.
Facultad de Ciencias Astronómicas y Geofísicas
description LHA 115-S 18 is a very peculiar emission-line star exhibiting the B[e] phenomenon. Located in the Small Magellanic Cloud, its spectrum shows features of an extremely wide range of excitation and ionization stages, extending from highly ionized atomic lines (Si IV, CIV, HeII) in the ultraviolet and optical regions to molecular emission bands of CO and TiO in the optical and infrared regions. The most distinguishing spectral characteristic of LHA 115-S 18 is the high variability detected in the He II λ4686 emission line, which can be a very conspicuous or completely invisible feature. In thiswork,we report on another peculiarity ofLHA115-S 18. From high-resolution optical spectra taken between 2000 and 2008, we discovered the appearance and strengthening of two emission features at λλ6825 and 7082Å, which we have identified as Raman-scattered lines. This is the first time that these lines have been detected in the spectrum of a massive luminous B[e] star. As the classification of LHA 115-S 18 is highly controversial, we discuss how the discovery of the appearance of Raman-scattered lines in this peculiar star might help us to solve this puzzle.
publishDate 2012
dc.date.none.fl_str_mv 2012-11
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/10915/84551
url http://sedici.unlp.edu.ar/handle/10915/84551
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/1745-3933
info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1745-3933.2012.01349.x
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
L80-L84
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 12.982451

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