On the evolutionary status and pulsations of the recently discovered blue large-amplitude pulsators (BLAPs)

Autores
Romero, Alejandra Daniela; Corsico, Alejandro Hugo; Althaus, Leandro Gabriel; Pelisoli, I.; Kepler, S. O.
Año de publicación
2018
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The blue large-amplitude pulsators (BLAPs) constitute a new class of pulsating stars. They are hot stars with effective temperatures of ∼30 000 K and surface gravities of log g ∼ 4.9, that pulsate with periods in the range 20−40 min. Until now, their origin and evolutionary state, as well as the nature of their pulsations, were not been unveiled. In this paper, we propose that the BLAPs are the hot counterpart of the already known pulsating pre-extremely low mass (pre-ELM) white dwarf (WD) stars, that are He-core low-mass stars resulting from interacting binary evolution. Using fully evolutionary sequences, we show that the BLAPs are well represented by pre-ELM WD models with high effective temperature and stellar masses ∼0.34 M⊙. From the analysis of their pulsational properties, we find that the observed variabilities can be explained by high-order non-radial g-mode pulsations or, in the case of the shortest periods, also by low-order radial modes, including the fundamental radial mode. The theoretical modes with periods in the observed range are unstable due to the κ mechanism associated with the Z-bump in the opacity at log T ∼ 5.25.
Fil: Romero, Alejandra Daniela. Universidade Federal do Rio Grande do Sul; Brasil. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Corsico, Alejandro Hugo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Fil: Althaus, Leandro Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Fil: Pelisoli, I.. Universidade Federal do Rio Grande do Sul; Brasil
Fil: Kepler, S. O.. Universidade Federal do Rio Grande do Sul; Brasil
Materia
STARS: EVOLUTION
STARS: VARIABLES: GENERAL
WHITE DWARF
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:11336/95386
Acceder
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network_name_str CONICET Digital (CONICET)
spelling On the evolutionary status and pulsations of the recently discovered blue large-amplitude pulsators (BLAPs)Romero, Alejandra DanielaCorsico, Alejandro HugoAlthaus, Leandro GabrielPelisoli, I.Kepler, S. O.STARS: EVOLUTIONSTARS: VARIABLES: GENERALWHITE DWARFhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1The blue large-amplitude pulsators (BLAPs) constitute a new class of pulsating stars. They are hot stars with effective temperatures of ∼30 000 K and surface gravities of log g ∼ 4.9, that pulsate with periods in the range 20−40 min. Until now, their origin and evolutionary state, as well as the nature of their pulsations, were not been unveiled. In this paper, we propose that the BLAPs are the hot counterpart of the already known pulsating pre-extremely low mass (pre-ELM) white dwarf (WD) stars, that are He-core low-mass stars resulting from interacting binary evolution. Using fully evolutionary sequences, we show that the BLAPs are well represented by pre-ELM WD models with high effective temperature and stellar masses ∼0.34 M⊙. From the analysis of their pulsational properties, we find that the observed variabilities can be explained by high-order non-radial g-mode pulsations or, in the case of the shortest periods, also by low-order radial modes, including the fundamental radial mode. The theoretical modes with periods in the observed range are unstable due to the κ mechanism associated with the Z-bump in the opacity at log T ∼ 5.25.Fil: Romero, Alejandra Daniela. Universidade Federal do Rio Grande do Sul; Brasil. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Corsico, Alejandro Hugo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; ArgentinaFil: Althaus, Leandro Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; ArgentinaFil: Pelisoli, I.. Universidade Federal do Rio Grande do Sul; BrasilFil: Kepler, S. O.. Universidade Federal do Rio Grande do Sul; BrasilOxford University Press2018-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/95386Romero, Alejandra Daniela; Corsico, Alejandro Hugo; Althaus, Leandro Gabriel; Pelisoli, I.; Kepler, S. O.; On the evolutionary status and pulsations of the recently discovered blue large-amplitude pulsators (BLAPs); Oxford University Press; Monthly Notices of the Royal Astronomical Society: Letters; 477; 1; 6-2018; L30-L341745-3933CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1093/mnrasl/sly051info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnrasl/article/477/1/L30/4956058info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:23:37Zoai:ri.conicet.gov.ar:11336/95386instacron: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 10:23:37.83CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv On the evolutionary status and pulsations of the recently discovered blue large-amplitude pulsators (BLAPs)
title On the evolutionary status and pulsations of the recently discovered blue large-amplitude pulsators (BLAPs)
spellingShingle On the evolutionary status and pulsations of the recently discovered blue large-amplitude pulsators (BLAPs)
Romero, Alejandra Daniela
STARS: EVOLUTION
STARS: VARIABLES: GENERAL
WHITE DWARF
title_short On the evolutionary status and pulsations of the recently discovered blue large-amplitude pulsators (BLAPs)
title_full On the evolutionary status and pulsations of the recently discovered blue large-amplitude pulsators (BLAPs)
title_fullStr On the evolutionary status and pulsations of the recently discovered blue large-amplitude pulsators (BLAPs)
title_full_unstemmed On the evolutionary status and pulsations of the recently discovered blue large-amplitude pulsators (BLAPs)
title_sort On the evolutionary status and pulsations of the recently discovered blue large-amplitude pulsators (BLAPs)
dc.creator.none.fl_str_mv Romero, Alejandra Daniela
Corsico, Alejandro Hugo
Althaus, Leandro Gabriel
Pelisoli, I.
Kepler, S. O.
author Romero, Alejandra Daniela
author_facet Romero, Alejandra Daniela
Corsico, Alejandro Hugo
Althaus, Leandro Gabriel
Pelisoli, I.
Kepler, S. O.
author_role author
author2 Corsico, Alejandro Hugo
Althaus, Leandro Gabriel
Pelisoli, I.
Kepler, S. O.
author2_role author
author
author
author
dc.subject.none.fl_str_mv STARS: EVOLUTION
STARS: VARIABLES: GENERAL
WHITE DWARF
topic STARS: EVOLUTION
STARS: VARIABLES: GENERAL
WHITE DWARF
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The blue large-amplitude pulsators (BLAPs) constitute a new class of pulsating stars. They are hot stars with effective temperatures of ∼30 000 K and surface gravities of log g ∼ 4.9, that pulsate with periods in the range 20−40 min. Until now, their origin and evolutionary state, as well as the nature of their pulsations, were not been unveiled. In this paper, we propose that the BLAPs are the hot counterpart of the already known pulsating pre-extremely low mass (pre-ELM) white dwarf (WD) stars, that are He-core low-mass stars resulting from interacting binary evolution. Using fully evolutionary sequences, we show that the BLAPs are well represented by pre-ELM WD models with high effective temperature and stellar masses ∼0.34 M⊙. From the analysis of their pulsational properties, we find that the observed variabilities can be explained by high-order non-radial g-mode pulsations or, in the case of the shortest periods, also by low-order radial modes, including the fundamental radial mode. The theoretical modes with periods in the observed range are unstable due to the κ mechanism associated with the Z-bump in the opacity at log T ∼ 5.25.
Fil: Romero, Alejandra Daniela. Universidade Federal do Rio Grande do Sul; Brasil. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Corsico, Alejandro Hugo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Fil: Althaus, Leandro Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Fil: Pelisoli, I.. Universidade Federal do Rio Grande do Sul; Brasil
Fil: Kepler, S. O.. Universidade Federal do Rio Grande do Sul; Brasil
description The blue large-amplitude pulsators (BLAPs) constitute a new class of pulsating stars. They are hot stars with effective temperatures of ∼30 000 K and surface gravities of log g ∼ 4.9, that pulsate with periods in the range 20−40 min. Until now, their origin and evolutionary state, as well as the nature of their pulsations, were not been unveiled. In this paper, we propose that the BLAPs are the hot counterpart of the already known pulsating pre-extremely low mass (pre-ELM) white dwarf (WD) stars, that are He-core low-mass stars resulting from interacting binary evolution. Using fully evolutionary sequences, we show that the BLAPs are well represented by pre-ELM WD models with high effective temperature and stellar masses ∼0.34 M⊙. From the analysis of their pulsational properties, we find that the observed variabilities can be explained by high-order non-radial g-mode pulsations or, in the case of the shortest periods, also by low-order radial modes, including the fundamental radial mode. The theoretical modes with periods in the observed range are unstable due to the κ mechanism associated with the Z-bump in the opacity at log T ∼ 5.25.
publishDate 2018
dc.date.none.fl_str_mv 2018-06
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/11336/95386
Romero, Alejandra Daniela; Corsico, Alejandro Hugo; Althaus, Leandro Gabriel; Pelisoli, I.; Kepler, S. O.; On the evolutionary status and pulsations of the recently discovered blue large-amplitude pulsators (BLAPs); Oxford University Press; Monthly Notices of the Royal Astronomical Society: Letters; 477; 1; 6-2018; L30-L34
1745-3933
CONICET Digital
CONICET
url http://hdl.handle.net/11336/95386
identifier_str_mv Romero, Alejandra Daniela; Corsico, Alejandro Hugo; Althaus, Leandro Gabriel; Pelisoli, I.; Kepler, S. O.; On the evolutionary status and pulsations of the recently discovered blue large-amplitude pulsators (BLAPs); Oxford University Press; Monthly Notices of the Royal Astronomical Society: Letters; 477; 1; 6-2018; L30-L34
1745-3933
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1093/mnrasl/sly051
info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnrasl/article/477/1/L30/4956058
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
application/pdf
dc.publisher.none.fl_str_mv Oxford University Press
publisher.none.fl_str_mv Oxford University 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
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score 13.070432

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