The discovery of a shell-like event in the O-type star HD 120678

Autores
Gamen, Roberto Claudio; Arias, Julia Inés; Barbá, Rodolfo Héctor; Morrell, Nidia Irene; Walborn, Nolan Revere; Sota, Alfredo; Maíz Apellániz, Jesús; Alfaro, Emilio J.
Año de publicación
2012
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Aims. We report the detection of a shell-like event in the Oe-type star HD 120678. Methods. HD 120678 has been intensively observed as part of a high-resolution spectroscopic monitoring program of southern Galactic O stars and Wolf-Rayet stars of the nitrogen sequence. Results. An optical spectrogram of HD 120678 obtained in June 2008 shows strong H and He i absorption lines instead of the double-peaked emission profiles observed both previously and subsequently, as well as a variety of previously undetected absorption features, mainly of O ii, Si iii and Fe iii. Photometric data reveal that the development of the absorption spectrum coincided with a remarkable dip in the V-band lightcurve. The "shell phase" of HD 120678 did not persist for very long: the V magnitude recovered its previous average value in fewer than 120 days, whereas H and He emission lines became detectable one year later. Similar spectral variations have been observed in a few Be stars, and they are usually interpreted as changes in the circumstellar disk.
Instituto de Astrofísica de La Plata
Materia
Ciencias Astronómicas
Binaries: spectroscopic
Stars: early-type
Stars: emission-line, Be
Stars: individual: HD 120678
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:10915/84002
Acceder
id SEDICI_0bc81da05c22a760f23111a15dde74ad
oai_identifier_str oai:sedici.unlp.edu.ar:10915/84002
network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling The discovery of a shell-like event in the O-type star HD 120678Gamen, Roberto ClaudioArias, Julia InésBarbá, Rodolfo HéctorMorrell, Nidia IreneWalborn, Nolan RevereSota, AlfredoMaíz Apellániz, JesúsAlfaro, Emilio J.Ciencias AstronómicasBinaries: spectroscopicStars: early-typeStars: emission-line, BeStars: individual: HD 120678Aims. We report the detection of a shell-like event in the Oe-type star HD 120678. Methods. HD 120678 has been intensively observed as part of a high-resolution spectroscopic monitoring program of southern Galactic O stars and Wolf-Rayet stars of the nitrogen sequence. Results. An optical spectrogram of HD 120678 obtained in June 2008 shows strong H and He i absorption lines instead of the double-peaked emission profiles observed both previously and subsequently, as well as a variety of previously undetected absorption features, mainly of O ii, Si iii and Fe iii. Photometric data reveal that the development of the absorption spectrum coincided with a remarkable dip in the V-band lightcurve. The "shell phase" of HD 120678 did not persist for very long: the V magnitude recovered its previous average value in fewer than 120 days, whereas H and He emission lines became detectable one year later. Similar spectral variations have been observed in a few Be stars, and they are usually interpreted as changes in the circumstellar disk.Instituto de Astrofísica de La Plata2012info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/84002enginfo:eu-repo/semantics/altIdentifier/issn/0004-6361info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201118725info: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:10915/84002Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:16:01.488SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv The discovery of a shell-like event in the O-type star HD 120678
title The discovery of a shell-like event in the O-type star HD 120678
spellingShingle The discovery of a shell-like event in the O-type star HD 120678
Gamen, Roberto Claudio
Ciencias Astronómicas
Binaries: spectroscopic
Stars: early-type
Stars: emission-line, Be
Stars: individual: HD 120678
title_short The discovery of a shell-like event in the O-type star HD 120678
title_full The discovery of a shell-like event in the O-type star HD 120678
title_fullStr The discovery of a shell-like event in the O-type star HD 120678
title_full_unstemmed The discovery of a shell-like event in the O-type star HD 120678
title_sort The discovery of a shell-like event in the O-type star HD 120678
dc.creator.none.fl_str_mv Gamen, Roberto Claudio
Arias, Julia Inés
Barbá, Rodolfo Héctor
Morrell, Nidia Irene
Walborn, Nolan Revere
Sota, Alfredo
Maíz Apellániz, Jesús
Alfaro, Emilio J.
author Gamen, Roberto Claudio
author_facet Gamen, Roberto Claudio
Arias, Julia Inés
Barbá, Rodolfo Héctor
Morrell, Nidia Irene
Walborn, Nolan Revere
Sota, Alfredo
Maíz Apellániz, Jesús
Alfaro, Emilio J.
author_role author
author2 Arias, Julia Inés
Barbá, Rodolfo Héctor
Morrell, Nidia Irene
Walborn, Nolan Revere
Sota, Alfredo
Maíz Apellániz, Jesús
Alfaro, Emilio J.
author2_role author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Ciencias Astronómicas
Binaries: spectroscopic
Stars: early-type
Stars: emission-line, Be
Stars: individual: HD 120678
topic Ciencias Astronómicas
Binaries: spectroscopic
Stars: early-type
Stars: emission-line, Be
Stars: individual: HD 120678
dc.description.none.fl_txt_mv Aims. We report the detection of a shell-like event in the Oe-type star HD 120678. Methods. HD 120678 has been intensively observed as part of a high-resolution spectroscopic monitoring program of southern Galactic O stars and Wolf-Rayet stars of the nitrogen sequence. Results. An optical spectrogram of HD 120678 obtained in June 2008 shows strong H and He i absorption lines instead of the double-peaked emission profiles observed both previously and subsequently, as well as a variety of previously undetected absorption features, mainly of O ii, Si iii and Fe iii. Photometric data reveal that the development of the absorption spectrum coincided with a remarkable dip in the V-band lightcurve. The "shell phase" of HD 120678 did not persist for very long: the V magnitude recovered its previous average value in fewer than 120 days, whereas H and He emission lines became detectable one year later. Similar spectral variations have been observed in a few Be stars, and they are usually interpreted as changes in the circumstellar disk.
Instituto de Astrofísica de La Plata
description Aims. We report the detection of a shell-like event in the Oe-type star HD 120678. Methods. HD 120678 has been intensively observed as part of a high-resolution spectroscopic monitoring program of southern Galactic O stars and Wolf-Rayet stars of the nitrogen sequence. Results. An optical spectrogram of HD 120678 obtained in June 2008 shows strong H and He i absorption lines instead of the double-peaked emission profiles observed both previously and subsequently, as well as a variety of previously undetected absorption features, mainly of O ii, Si iii and Fe iii. Photometric data reveal that the development of the absorption spectrum coincided with a remarkable dip in the V-band lightcurve. The "shell phase" of HD 120678 did not persist for very long: the V magnitude recovered its previous average value in fewer than 120 days, whereas H and He emission lines became detectable one year later. Similar spectral variations have been observed in a few Be stars, and they are usually interpreted as changes in the circumstellar disk.
publishDate 2012
dc.date.none.fl_str_mv 2012
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/10915/84002
url http://sedici.unlp.edu.ar/handle/10915/84002
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/0004-6361
info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201118725
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
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
_version_ 1844616032698761216
score 13.070432

Publicaciones similares