A search for OB stars in the field of the galactic OB association Bochum 7 : I. UBV-IR photometry and optical spectroscopy

Autores
Corti, Mariela Alejandra; Bosch, Guillermo Luis; Niemelä, Virpi Sinikka
Año de publicación
2007
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Context. The presence of a Wolf-Rayet star, WR12, at α = 8 h44m47.2s, δ = -45°58′55. 5″ (J2000.0), triggered the search for a surrounding OB association now known as Bochum 7. Several papers have dealt with the existence of Bo 7, but none actually included spectral types of the stars. To assure the spectral types of members of the association, it is essential to have spectral images of them. Aims. In this paper we present previously unpublished spectra of OB stars over a 30 arcmin field covering the estimated field of the galactic OB association. Methods. From UBV aperture photometry, OB star candidates were selected, and optical spectroscopic observations were obtained for these in CASLEO, Argentina. Results. 63 stars were classified as OB type, including 8 stars already present in the LSS catalogue, and 37 of these 63 stars did not have a well-known spectral type. The OB stars were used to test the properties of the interstellar dust in the line of sight and the relation between the diffuse interestelar band at 4428 A, which grows linearly with E(B-V) until 1 mag. Combining our data with 2MASS IR photometry we tested and confirmed that derivation of stellar parameters from our photometry, using the CHORIZOS code, is highly reliable.
Facultad de Ciencias Astronómicas y Geofísicas
Materia
Ciencias Astronómicas
Galaxy: open clusters and associations: individual: Bochum 7
Stars: early-type
Techniques: photometric
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:10915/82975

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oai_identifier_str oai:sedici.unlp.edu.ar:10915/82975
network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling A search for OB stars in the field of the galactic OB association Bochum 7 : I. UBV-IR photometry and optical spectroscopyCorti, Mariela AlejandraBosch, Guillermo LuisNiemelä, Virpi SinikkaCiencias AstronómicasGalaxy: open clusters and associations: individual: Bochum 7Stars: early-typeTechniques: photometricTechniques: spectroscopicContext. The presence of a Wolf-Rayet star, WR12, at α = 8 h44m47.2s, δ = -45°58′55. 5″ (J2000.0), triggered the search for a surrounding OB association now known as Bochum 7. Several papers have dealt with the existence of Bo 7, but none actually included spectral types of the stars. To assure the spectral types of members of the association, it is essential to have spectral images of them. Aims. In this paper we present previously unpublished spectra of OB stars over a 30 arcmin field covering the estimated field of the galactic OB association. Methods. From UBV aperture photometry, OB star candidates were selected, and optical spectroscopic observations were obtained for these in CASLEO, Argentina. Results. 63 stars were classified as OB type, including 8 stars already present in the LSS catalogue, and 37 of these 63 stars did not have a well-known spectral type. The OB stars were used to test the properties of the interstellar dust in the line of sight and the relation between the diffuse interestelar band at 4428 A, which grows linearly with E(B-V) until 1 mag. Combining our data with 2MASS IR photometry we tested and confirmed that derivation of stellar parameters from our photometry, using the CHORIZOS code, is highly reliable.Facultad de Ciencias Astronómicas y Geofísicas2007info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf137-143http://sedici.unlp.edu.ar/handle/10915/82975enginfo:eu-repo/semantics/altIdentifier/issn/0004-6361info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361:20065041info: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:UNLP2025-09-29T11:15:41Zoai:sedici.unlp.edu.ar:10915/82975Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:15:42.174SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv A search for OB stars in the field of the galactic OB association Bochum 7 : I. UBV-IR photometry and optical spectroscopy
title A search for OB stars in the field of the galactic OB association Bochum 7 : I. UBV-IR photometry and optical spectroscopy
spellingShingle A search for OB stars in the field of the galactic OB association Bochum 7 : I. UBV-IR photometry and optical spectroscopy
Corti, Mariela Alejandra
Ciencias Astronómicas
Galaxy: open clusters and associations: individual: Bochum 7
Stars: early-type
Techniques: photometric
Techniques: spectroscopic
title_short A search for OB stars in the field of the galactic OB association Bochum 7 : I. UBV-IR photometry and optical spectroscopy
title_full A search for OB stars in the field of the galactic OB association Bochum 7 : I. UBV-IR photometry and optical spectroscopy
title_fullStr A search for OB stars in the field of the galactic OB association Bochum 7 : I. UBV-IR photometry and optical spectroscopy
title_full_unstemmed A search for OB stars in the field of the galactic OB association Bochum 7 : I. UBV-IR photometry and optical spectroscopy
title_sort A search for OB stars in the field of the galactic OB association Bochum 7 : I. UBV-IR photometry and optical spectroscopy
dc.creator.none.fl_str_mv Corti, Mariela Alejandra
Bosch, Guillermo Luis
Niemelä, Virpi Sinikka
author Corti, Mariela Alejandra
author_facet Corti, Mariela Alejandra
Bosch, Guillermo Luis
Niemelä, Virpi Sinikka
author_role author
author2 Bosch, Guillermo Luis
Niemelä, Virpi Sinikka
author2_role author
author
dc.subject.none.fl_str_mv Ciencias Astronómicas
Galaxy: open clusters and associations: individual: Bochum 7
Stars: early-type
Techniques: photometric
Techniques: spectroscopic
topic Ciencias Astronómicas
Galaxy: open clusters and associations: individual: Bochum 7
Stars: early-type
Techniques: photometric
Techniques: spectroscopic
dc.description.none.fl_txt_mv Context. The presence of a Wolf-Rayet star, WR12, at α = 8 h44m47.2s, δ = -45°58′55. 5″ (J2000.0), triggered the search for a surrounding OB association now known as Bochum 7. Several papers have dealt with the existence of Bo 7, but none actually included spectral types of the stars. To assure the spectral types of members of the association, it is essential to have spectral images of them. Aims. In this paper we present previously unpublished spectra of OB stars over a 30 arcmin field covering the estimated field of the galactic OB association. Methods. From UBV aperture photometry, OB star candidates were selected, and optical spectroscopic observations were obtained for these in CASLEO, Argentina. Results. 63 stars were classified as OB type, including 8 stars already present in the LSS catalogue, and 37 of these 63 stars did not have a well-known spectral type. The OB stars were used to test the properties of the interstellar dust in the line of sight and the relation between the diffuse interestelar band at 4428 A, which grows linearly with E(B-V) until 1 mag. Combining our data with 2MASS IR photometry we tested and confirmed that derivation of stellar parameters from our photometry, using the CHORIZOS code, is highly reliable.
Facultad de Ciencias Astronómicas y Geofísicas
description Context. The presence of a Wolf-Rayet star, WR12, at α = 8 h44m47.2s, δ = -45°58′55. 5″ (J2000.0), triggered the search for a surrounding OB association now known as Bochum 7. Several papers have dealt with the existence of Bo 7, but none actually included spectral types of the stars. To assure the spectral types of members of the association, it is essential to have spectral images of them. Aims. In this paper we present previously unpublished spectra of OB stars over a 30 arcmin field covering the estimated field of the galactic OB association. Methods. From UBV aperture photometry, OB star candidates were selected, and optical spectroscopic observations were obtained for these in CASLEO, Argentina. Results. 63 stars were classified as OB type, including 8 stars already present in the LSS catalogue, and 37 of these 63 stars did not have a well-known spectral type. The OB stars were used to test the properties of the interstellar dust in the line of sight and the relation between the diffuse interestelar band at 4428 A, which grows linearly with E(B-V) until 1 mag. Combining our data with 2MASS IR photometry we tested and confirmed that derivation of stellar parameters from our photometry, using the CHORIZOS code, is highly reliable.
publishDate 2007
dc.date.none.fl_str_mv 2007
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/10915/82975
url http://sedici.unlp.edu.ar/handle/10915/82975
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/10.1051/0004-6361:20065041
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
137-143
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
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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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