δ Sct pulsation in magnetic Ap stars: The discovery of δ Sct pulsations in HD 218994AB and measurement of the magnetic fields of HD 218994A and HD 21190

Autores
Kurtz, D. W.; Hubrig, S.; Gonzalez, Jorge Federico; van Wyk, F.; Martinez, P.
Año de publicación
2008
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We have discovered that at least one component of the visual binary star HD 218994AB is a δ Sct star. The primary star of this system is a known rapidly oscillating Ap (roAp) star; therefore, it is possible that it is both an roAp star and a δ Sct star - a hybrid. There are no confirmed such hybrid roAp-δ Sct stars, and they are predicted theoretically not to exist. More probably, HD 218994B is the δ Sct star, as it is 0.54 mag fainter than the primary and also lies in the δ Sct instability strip. It then offers the potential to determine Teff and L for the primary which appears to be one of the more evolved roAp stars and an important test the theoretically calculated roAp star instability strip. In this case, the system also is important since the stars are a co-eval pair of very similar mass, yet one is a magnetic roAp star and the other is probably a non-magnetic δ Sct star with a normal spectrum. We detect a significant longitudinal magnetic field strength of 440 ± 23 G in the roAp star HD 218994A. We also present the first measurement of the longitudinal magnetic field strength for the δ Sct star HD 21190, the most-evolved Ap star known. We obtain a formally significant value of 47 ± 13 G. If confirmed, this will make HD 21190 the first magnetic δ Sct star known.
Fil: Kurtz, D. W.. University of Central Lancashire; Estados Unidos
Fil: Hubrig, S.. European Southern Observatory Chile; Chile
Fil: Gonzalez, Jorge Federico. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Complejo Astronómico "El Leoncito". Universidad Nacional de Córdoba. Complejo Astronómico "El Leoncito". Universidad Nacional de la Plata. Complejo Astronómico "El Leoncito". Universidad Nacional de San Juan. Complejo Astronómico "El Leoncito"; Argentina
Fil: van Wyk, F.. South African Astronomical Observatory; Sudáfrica
Fil: Martinez, P.. South African Astronomical Observatory; Sudáfrica
Materia
BINARIES: VISUAL
STARS: CHEMICALLY PECULIAR
STARS: INDIVIDUAL: HD 218994
STARS: MAGNETIC FIELDS
STARS: VARIABLES: OTHER
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:11336/214860
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/214860
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling δ Sct pulsation in magnetic Ap stars: The discovery of δ Sct pulsations in HD 218994AB and measurement of the magnetic fields of HD 218994A and HD 21190Kurtz, D. W.Hubrig, S.Gonzalez, Jorge Federicovan Wyk, F.Martinez, P.BINARIES: VISUALSTARS: CHEMICALLY PECULIARSTARS: INDIVIDUAL: HD 218994STARS: MAGNETIC FIELDSSTARS: VARIABLES: OTHERhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We have discovered that at least one component of the visual binary star HD 218994AB is a δ Sct star. The primary star of this system is a known rapidly oscillating Ap (roAp) star; therefore, it is possible that it is both an roAp star and a δ Sct star - a hybrid. There are no confirmed such hybrid roAp-δ Sct stars, and they are predicted theoretically not to exist. More probably, HD 218994B is the δ Sct star, as it is 0.54 mag fainter than the primary and also lies in the δ Sct instability strip. It then offers the potential to determine Teff and L for the primary which appears to be one of the more evolved roAp stars and an important test the theoretically calculated roAp star instability strip. In this case, the system also is important since the stars are a co-eval pair of very similar mass, yet one is a magnetic roAp star and the other is probably a non-magnetic δ Sct star with a normal spectrum. We detect a significant longitudinal magnetic field strength of 440 ± 23 G in the roAp star HD 218994A. We also present the first measurement of the longitudinal magnetic field strength for the δ Sct star HD 21190, the most-evolved Ap star known. We obtain a formally significant value of 47 ± 13 G. If confirmed, this will make HD 21190 the first magnetic δ Sct star known.Fil: Kurtz, D. W.. University of Central Lancashire; Estados UnidosFil: Hubrig, S.. European Southern Observatory Chile; ChileFil: Gonzalez, Jorge Federico. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Complejo Astronómico "El Leoncito". Universidad Nacional de Córdoba. Complejo Astronómico "El Leoncito". Universidad Nacional de la Plata. Complejo Astronómico "El Leoncito". Universidad Nacional de San Juan. Complejo Astronómico "El Leoncito"; ArgentinaFil: van Wyk, F.. South African Astronomical Observatory; SudáfricaFil: Martinez, P.. South African Astronomical Observatory; SudáfricaWiley Blackwell Publishing, Inc2008-05info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/214860Kurtz, D. W.; Hubrig, S.; Gonzalez, Jorge Federico; van Wyk, F.; Martinez, P.; δ Sct pulsation in magnetic Ap stars: The discovery of δ Sct pulsations in HD 218994AB and measurement of the magnetic fields of HD 218994A and HD 21190; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 386; 3; 5-2008; 1750-17550035-8711CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-2966.2008.13154.xinfo:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article/386/3/1750/1063425info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-15T14:21:04Zoai:ri.conicet.gov.ar:11336/214860instacron: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:34982025-10-15 14:21:04.494CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv δ Sct pulsation in magnetic Ap stars: The discovery of δ Sct pulsations in HD 218994AB and measurement of the magnetic fields of HD 218994A and HD 21190
title δ Sct pulsation in magnetic Ap stars: The discovery of δ Sct pulsations in HD 218994AB and measurement of the magnetic fields of HD 218994A and HD 21190
spellingShingle δ Sct pulsation in magnetic Ap stars: The discovery of δ Sct pulsations in HD 218994AB and measurement of the magnetic fields of HD 218994A and HD 21190
Kurtz, D. W.
BINARIES: VISUAL
STARS: CHEMICALLY PECULIAR
STARS: INDIVIDUAL: HD 218994
STARS: MAGNETIC FIELDS
STARS: VARIABLES: OTHER
title_short δ Sct pulsation in magnetic Ap stars: The discovery of δ Sct pulsations in HD 218994AB and measurement of the magnetic fields of HD 218994A and HD 21190
title_full δ Sct pulsation in magnetic Ap stars: The discovery of δ Sct pulsations in HD 218994AB and measurement of the magnetic fields of HD 218994A and HD 21190
title_fullStr δ Sct pulsation in magnetic Ap stars: The discovery of δ Sct pulsations in HD 218994AB and measurement of the magnetic fields of HD 218994A and HD 21190
title_full_unstemmed δ Sct pulsation in magnetic Ap stars: The discovery of δ Sct pulsations in HD 218994AB and measurement of the magnetic fields of HD 218994A and HD 21190
title_sort δ Sct pulsation in magnetic Ap stars: The discovery of δ Sct pulsations in HD 218994AB and measurement of the magnetic fields of HD 218994A and HD 21190
dc.creator.none.fl_str_mv Kurtz, D. W.
Hubrig, S.
Gonzalez, Jorge Federico
van Wyk, F.
Martinez, P.
author Kurtz, D. W.
author_facet Kurtz, D. W.
Hubrig, S.
Gonzalez, Jorge Federico
van Wyk, F.
Martinez, P.
author_role author
author2 Hubrig, S.
Gonzalez, Jorge Federico
van Wyk, F.
Martinez, P.
author2_role author
author
author
author
dc.subject.none.fl_str_mv BINARIES: VISUAL
STARS: CHEMICALLY PECULIAR
STARS: INDIVIDUAL: HD 218994
STARS: MAGNETIC FIELDS
STARS: VARIABLES: OTHER
topic BINARIES: VISUAL
STARS: CHEMICALLY PECULIAR
STARS: INDIVIDUAL: HD 218994
STARS: MAGNETIC FIELDS
STARS: VARIABLES: OTHER
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 discovered that at least one component of the visual binary star HD 218994AB is a δ Sct star. The primary star of this system is a known rapidly oscillating Ap (roAp) star; therefore, it is possible that it is both an roAp star and a δ Sct star - a hybrid. There are no confirmed such hybrid roAp-δ Sct stars, and they are predicted theoretically not to exist. More probably, HD 218994B is the δ Sct star, as it is 0.54 mag fainter than the primary and also lies in the δ Sct instability strip. It then offers the potential to determine Teff and L for the primary which appears to be one of the more evolved roAp stars and an important test the theoretically calculated roAp star instability strip. In this case, the system also is important since the stars are a co-eval pair of very similar mass, yet one is a magnetic roAp star and the other is probably a non-magnetic δ Sct star with a normal spectrum. We detect a significant longitudinal magnetic field strength of 440 ± 23 G in the roAp star HD 218994A. We also present the first measurement of the longitudinal magnetic field strength for the δ Sct star HD 21190, the most-evolved Ap star known. We obtain a formally significant value of 47 ± 13 G. If confirmed, this will make HD 21190 the first magnetic δ Sct star known.
Fil: Kurtz, D. W.. University of Central Lancashire; Estados Unidos
Fil: Hubrig, S.. European Southern Observatory Chile; Chile
Fil: Gonzalez, Jorge Federico. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Complejo Astronómico "El Leoncito". Universidad Nacional de Córdoba. Complejo Astronómico "El Leoncito". Universidad Nacional de la Plata. Complejo Astronómico "El Leoncito". Universidad Nacional de San Juan. Complejo Astronómico "El Leoncito"; Argentina
Fil: van Wyk, F.. South African Astronomical Observatory; Sudáfrica
Fil: Martinez, P.. South African Astronomical Observatory; Sudáfrica
description We have discovered that at least one component of the visual binary star HD 218994AB is a δ Sct star. The primary star of this system is a known rapidly oscillating Ap (roAp) star; therefore, it is possible that it is both an roAp star and a δ Sct star - a hybrid. There are no confirmed such hybrid roAp-δ Sct stars, and they are predicted theoretically not to exist. More probably, HD 218994B is the δ Sct star, as it is 0.54 mag fainter than the primary and also lies in the δ Sct instability strip. It then offers the potential to determine Teff and L for the primary which appears to be one of the more evolved roAp stars and an important test the theoretically calculated roAp star instability strip. In this case, the system also is important since the stars are a co-eval pair of very similar mass, yet one is a magnetic roAp star and the other is probably a non-magnetic δ Sct star with a normal spectrum. We detect a significant longitudinal magnetic field strength of 440 ± 23 G in the roAp star HD 218994A. We also present the first measurement of the longitudinal magnetic field strength for the δ Sct star HD 21190, the most-evolved Ap star known. We obtain a formally significant value of 47 ± 13 G. If confirmed, this will make HD 21190 the first magnetic δ Sct star known.
publishDate 2008
dc.date.none.fl_str_mv 2008-05
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/11336/214860
Kurtz, D. W.; Hubrig, S.; Gonzalez, Jorge Federico; van Wyk, F.; Martinez, P.; δ Sct pulsation in magnetic Ap stars: The discovery of δ Sct pulsations in HD 218994AB and measurement of the magnetic fields of HD 218994A and HD 21190; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 386; 3; 5-2008; 1750-1755
0035-8711
CONICET Digital
CONICET
url http://hdl.handle.net/11336/214860
identifier_str_mv Kurtz, D. W.; Hubrig, S.; Gonzalez, Jorge Federico; van Wyk, F.; Martinez, P.; δ Sct pulsation in magnetic Ap stars: The discovery of δ Sct pulsations in HD 218994AB and measurement of the magnetic fields of HD 218994A and HD 21190; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 386; 3; 5-2008; 1750-1755
0035-8711
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-2966.2008.13154.x
info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article/386/3/1750/1063425
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 Wiley Blackwell Publishing, Inc
publisher.none.fl_str_mv Wiley Blackwell Publishing, Inc
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
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score 12.891075

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