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
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/84551
Ver los metadatos del registro completo
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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:UNLP2025-09-29T11:16:01Zoai: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:13292025-09-29 11:16:01.468SEDICI (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) |
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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 |
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