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dc.contributor.author
Kurtz, D. W.
dc.contributor.author
Hubrig, S.
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Gonzalez, Jorge Federico
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van Wyk, F.
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Martinez, P.
dc.date.available
2023-10-11T15:41:07Z
dc.date.issued
2008-05
dc.identifier.citation
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
dc.identifier.issn
0035-8711
dc.identifier.uri
http://hdl.handle.net/11336/214860
dc.description.abstract
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.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Wiley Blackwell Publishing, Inc
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
BINARIES: VISUAL
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STARS: CHEMICALLY PECULIAR
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STARS: INDIVIDUAL: HD 218994
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STARS: MAGNETIC FIELDS
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STARS: VARIABLES: OTHER
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Astronomía
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Ciencias Físicas
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CIENCIAS NATURALES Y EXACTAS
dc.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
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2023-07-07T20:32:53Z
dc.journal.volume
386
dc.journal.number
3
dc.journal.pagination
1750-1755
dc.journal.pais
Reino Unido
dc.journal.ciudad
Londres
dc.description.fil
Fil: Kurtz, D. W.. University of Central Lancashire; Estados Unidos
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Fil: Hubrig, S.. European Southern Observatory Chile; Chile
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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
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Fil: van Wyk, F.. South African Astronomical Observatory; Sudáfrica
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Fil: Martinez, P.. South African Astronomical Observatory; Sudáfrica
dc.journal.title
Monthly Notices of the Royal Astronomical Society
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1111/j.1365-2966.2008.13154.x
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article/386/3/1750/1063425
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