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
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/38387
Ver los metadatos del registro completo
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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/ |
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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 |
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CONICET Digital (CONICET) |
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CONICET Digital (CONICET) |
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Consejo Nacional de Investigaciones Científicas y Técnicas |
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CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.mail.fl_str_mv |
dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
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