A Survey of N IV and O IV Features near 3400 Å in O2-O5 Spectra

Autores
Morrell, Nidia Irene; Walborn, Nolan Revere; Arias, Julia Ines
Año de publicación
2005
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We have conducted a survey of little-known N iv and O iv multiplets near 3400 A˚ in an extensive sample of well-classified, very early O-type spectra. The initial motivation was to search for additional useful classification criteria for these types, but an unexpected result is the high sensitivity of these features to evolutionary CNO processing. We have found a useful discriminant between O2 and later types in the relative strengths of the O iv multiplets, one of which is subject to selective emission in the hottest spectra; the overall strengths of these lines also decrease between spectral types O4 and O5. More remarkable, however, are the variations in the N/O ratios among both individual stars and clusters. For instance, several O4 If spectra have very large ratios, while main-sequence stars in the Carina Nebula generally have smaller values than others of the same spectral types in other regions. These effects correspond to different degrees of mixing of processed material as a function of evolutionary age and initial rotational velocities; the second effect provides significant further evidence that very massive stars mix while still on the main sequence. Thus, further analysis of these features will likely provide valuable diagnostics of important evolutionary parameters.
Fil: Morrell, Nidia Irene. Las Campanas Observatory; Chile
Fil: Walborn, Nolan Revere. Space Telescope Science Institute; Estados Unidos
Fil: Arias, Julia Ines. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Materia
Abundances
Early Type Stars
Evolution of Stars
Fundamental Parameters
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/38387

id CONICETDig_64393c635e5dc7fc5a39a522d82d5573
oai_identifier_str oai:ri.conicet.gov.ar:11336/38387
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling A Survey of N IV and O IV Features near 3400 Å in O2-O5 SpectraMorrell, Nidia IreneWalborn, Nolan RevereArias, Julia InesAbundancesEarly Type StarsEvolution of StarsFundamental Parametershttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We have conducted a survey of little-known N iv and O iv multiplets near 3400 A˚ in an extensive sample of well-classified, very early O-type spectra. The initial motivation was to search for additional useful classification criteria for these types, but an unexpected result is the high sensitivity of these features to evolutionary CNO processing. We have found a useful discriminant between O2 and later types in the relative strengths of the O iv multiplets, one of which is subject to selective emission in the hottest spectra; the overall strengths of these lines also decrease between spectral types O4 and O5. More remarkable, however, are the variations in the N/O ratios among both individual stars and clusters. For instance, several O4 If spectra have very large ratios, while main-sequence stars in the Carina Nebula generally have smaller values than others of the same spectral types in other regions. These effects correspond to different degrees of mixing of processed material as a function of evolutionary age and initial rotational velocities; the second effect provides significant further evidence that very massive stars mix while still on the main sequence. Thus, further analysis of these features will likely provide valuable diagnostics of important evolutionary parameters.Fil: Morrell, Nidia Irene. Las Campanas Observatory; ChileFil: Walborn, Nolan Revere. Space Telescope Science Institute; Estados UnidosFil: Arias, Julia Ines. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; ArgentinaUniversity of Chicago Press2005-07info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/38387Morrell, Nidia Irene; Walborn, Nolan Revere; Arias, Julia Ines; A Survey of N IV and O IV Features near 3400 Å in O2-O5 Spectra; University of Chicago Press; Publications of the Astronomical Society of the Pacific; 117; 833; 7-2005; 699-7050004-6280CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1086/430937info:eu-repo/semantics/altIdentifier/url/http://adsabs.harvard.edu/abs/2005PASP..117..699Minfo:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1086/430937info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:31:56Zoai:ri.conicet.gov.ar:11336/38387instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:31:57.123CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv A Survey of N IV and O IV Features near 3400 Å in O2-O5 Spectra
title A Survey of N IV and O IV Features near 3400 Å in O2-O5 Spectra
spellingShingle A Survey of N IV and O IV Features near 3400 Å in O2-O5 Spectra
Morrell, Nidia Irene
Abundances
Early Type Stars
Evolution of Stars
Fundamental Parameters
title_short A Survey of N IV and O IV Features near 3400 Å in O2-O5 Spectra
title_full A Survey of N IV and O IV Features near 3400 Å in O2-O5 Spectra
title_fullStr A Survey of N IV and O IV Features near 3400 Å in O2-O5 Spectra
title_full_unstemmed A Survey of N IV and O IV Features near 3400 Å in O2-O5 Spectra
title_sort A Survey of N IV and O IV Features near 3400 Å in O2-O5 Spectra
dc.creator.none.fl_str_mv Morrell, Nidia Irene
Walborn, Nolan Revere
Arias, Julia Ines
author Morrell, Nidia Irene
author_facet Morrell, Nidia Irene
Walborn, Nolan Revere
Arias, Julia Ines
author_role author
author2 Walborn, Nolan Revere
Arias, Julia Ines
author2_role author
author
dc.subject.none.fl_str_mv Abundances
Early Type Stars
Evolution of Stars
Fundamental Parameters
topic Abundances
Early Type Stars
Evolution of Stars
Fundamental Parameters
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv We have conducted a survey of little-known N iv and O iv multiplets near 3400 A˚ in an extensive sample of well-classified, very early O-type spectra. The initial motivation was to search for additional useful classification criteria for these types, but an unexpected result is the high sensitivity of these features to evolutionary CNO processing. We have found a useful discriminant between O2 and later types in the relative strengths of the O iv multiplets, one of which is subject to selective emission in the hottest spectra; the overall strengths of these lines also decrease between spectral types O4 and O5. More remarkable, however, are the variations in the N/O ratios among both individual stars and clusters. For instance, several O4 If spectra have very large ratios, while main-sequence stars in the Carina Nebula generally have smaller values than others of the same spectral types in other regions. These effects correspond to different degrees of mixing of processed material as a function of evolutionary age and initial rotational velocities; the second effect provides significant further evidence that very massive stars mix while still on the main sequence. Thus, further analysis of these features will likely provide valuable diagnostics of important evolutionary parameters.
Fil: Morrell, Nidia Irene. Las Campanas Observatory; Chile
Fil: Walborn, Nolan Revere. Space Telescope Science Institute; Estados Unidos
Fil: Arias, Julia Ines. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
description We have conducted a survey of little-known N iv and O iv multiplets near 3400 A˚ in an extensive sample of well-classified, very early O-type spectra. The initial motivation was to search for additional useful classification criteria for these types, but an unexpected result is the high sensitivity of these features to evolutionary CNO processing. We have found a useful discriminant between O2 and later types in the relative strengths of the O iv multiplets, one of which is subject to selective emission in the hottest spectra; the overall strengths of these lines also decrease between spectral types O4 and O5. More remarkable, however, are the variations in the N/O ratios among both individual stars and clusters. For instance, several O4 If spectra have very large ratios, while main-sequence stars in the Carina Nebula generally have smaller values than others of the same spectral types in other regions. These effects correspond to different degrees of mixing of processed material as a function of evolutionary age and initial rotational velocities; the second effect provides significant further evidence that very massive stars mix while still on the main sequence. Thus, further analysis of these features will likely provide valuable diagnostics of important evolutionary parameters.
publishDate 2005
dc.date.none.fl_str_mv 2005-07
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
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://hdl.handle.net/11336/38387
Morrell, Nidia Irene; Walborn, Nolan Revere; Arias, Julia Ines; A Survey of N IV and O IV Features near 3400 Å in O2-O5 Spectra; University of Chicago Press; Publications of the Astronomical Society of the Pacific; 117; 833; 7-2005; 699-705
0004-6280
CONICET Digital
CONICET
url http://hdl.handle.net/11336/38387
identifier_str_mv Morrell, Nidia Irene; Walborn, Nolan Revere; Arias, Julia Ines; A Survey of N IV and O IV Features near 3400 Å in O2-O5 Spectra; University of Chicago Press; Publications of the Astronomical Society of the Pacific; 117; 833; 7-2005; 699-705
0004-6280
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1086/430937
info:eu-repo/semantics/altIdentifier/url/http://adsabs.harvard.edu/abs/2005PASP..117..699M
info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1086/430937
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv University of Chicago Press
publisher.none.fl_str_mv University of Chicago Press
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
_version_ 1844614331939946496
score 13.070432