Revealing the nature of double-periodic blue variables in the Magellanic Clouds.

Autores
Mennickent, R. E.; Cidale, Lydia Sonia; Díaz, M.; Pietrzyński, G.; Gieren, W.; Sabogal, B.
Año de publicación
2005
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We present the first spectroscopic data for a sample of the recently discovered blue double-periodic variables in the Magellanic Clouds. The optical spectrum of these objects is dominated by Balmer and helium absorption lines and a continuum with a blue or sometimes flat slope. Spectral classification yields B spectral types and luminosity classes mostly of type III. However, the Hβ absorption line is weaker than expected for the spectral classification in most objects. For two objects, OGLE 05060009-6855025 and OGLE 05195898-6917013 we obtained time-resolved spectroscopy, finding radial velocity variations consistent with binarity. Phasing the short-term photometric variability of these two systems with their spectroscopic ephemeris, we find that they can be interpreted as ellipsoidal variations of the brighter component in a close binary system. From the analysis of their short-term light curves and radial velocities, we estimate that the cooler component could be a B-type dwarf. Our findings support the hypothesis that double-periodic variables are close binary systems consisting of two B-type stars. The shorter periodicity in non-eclipsing systems should be the ellipsoidal variation of the more evolved component. Regarding the long-term periodicity, we find their origin in or around the brighter star, as the oscillations virtually disappear at primary eclipse. Their nature remains unknown, at the present time. We also report the discovery of three (two of them eclipsing) new double-periodic variables in the Large Magellanic Cloud. One of them shows a shortening of the long-term period by approximately 20 per cent in a couple of cycles, which coincides with an increase of the maximum oscillation brightness. © 2005 RAS.
Fil: Mennickent, R. E.. Universidad de Concepción; Chile
Fil: Cidale, Lydia Sonia. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Fil: Díaz, M.. Universidade de Sao Paulo; Brasil
Fil: Pietrzyński, G.. Uniwersytet Warszawski; Argentina. Universidad de Concepción; Chile
Fil: Gieren, W.. Universidad de Concepción; Chile
Fil: Sabogal, B.. Universidad de Concepción; Chile
Materia
Binary stars
Early type stars
Evolution of stars
Mass loss
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:11336/38892
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Revealing the nature of double-periodic blue variables in the Magellanic Clouds.Mennickent, R. E.Cidale, Lydia SoniaDíaz, M.Pietrzyński, G.Gieren, W.Sabogal, B.Binary starsEarly type starsEvolution of starsMass losshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We present the first spectroscopic data for a sample of the recently discovered blue double-periodic variables in the Magellanic Clouds. The optical spectrum of these objects is dominated by Balmer and helium absorption lines and a continuum with a blue or sometimes flat slope. Spectral classification yields B spectral types and luminosity classes mostly of type III. However, the Hβ absorption line is weaker than expected for the spectral classification in most objects. For two objects, OGLE 05060009-6855025 and OGLE 05195898-6917013 we obtained time-resolved spectroscopy, finding radial velocity variations consistent with binarity. Phasing the short-term photometric variability of these two systems with their spectroscopic ephemeris, we find that they can be interpreted as ellipsoidal variations of the brighter component in a close binary system. From the analysis of their short-term light curves and radial velocities, we estimate that the cooler component could be a B-type dwarf. Our findings support the hypothesis that double-periodic variables are close binary systems consisting of two B-type stars. The shorter periodicity in non-eclipsing systems should be the ellipsoidal variation of the more evolved component. Regarding the long-term periodicity, we find their origin in or around the brighter star, as the oscillations virtually disappear at primary eclipse. Their nature remains unknown, at the present time. We also report the discovery of three (two of them eclipsing) new double-periodic variables in the Large Magellanic Cloud. One of them shows a shortening of the long-term period by approximately 20 per cent in a couple of cycles, which coincides with an increase of the maximum oscillation brightness. © 2005 RAS.Fil: Mennickent, R. E.. Universidad de Concepción; ChileFil: Cidale, Lydia Sonia. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; ArgentinaFil: Díaz, M.. Universidade de Sao Paulo; BrasilFil: Pietrzyński, G.. Uniwersytet Warszawski; Argentina. Universidad de Concepción; ChileFil: Gieren, W.. Universidad de Concepción; ChileFil: Sabogal, B.. Universidad de Concepción; ChileWiley Blackwell Publishing, Inc2005-03info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/38892Mennickent, R. E.; Cidale, Lydia Sonia; Díaz, M.; Pietrzyński, G.; Gieren, W.; et al.; Revealing the nature of double-periodic blue variables in the Magellanic Clouds.; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 357; 4; 3-2005; 1219-12300035-8711CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://adsabs.harvard.edu/abs/2005MNRAS.357.1219Minfo:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-2966.2005.08718.xinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:39:57Zoai:ri.conicet.gov.ar:11336/38892instacron: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 10:39:57.937CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Revealing the nature of double-periodic blue variables in the Magellanic Clouds.
title Revealing the nature of double-periodic blue variables in the Magellanic Clouds.
spellingShingle Revealing the nature of double-periodic blue variables in the Magellanic Clouds.
Mennickent, R. E.
Binary stars
Early type stars
Evolution of stars
Mass loss
title_short Revealing the nature of double-periodic blue variables in the Magellanic Clouds.
title_full Revealing the nature of double-periodic blue variables in the Magellanic Clouds.
title_fullStr Revealing the nature of double-periodic blue variables in the Magellanic Clouds.
title_full_unstemmed Revealing the nature of double-periodic blue variables in the Magellanic Clouds.
title_sort Revealing the nature of double-periodic blue variables in the Magellanic Clouds.
dc.creator.none.fl_str_mv Mennickent, R. E.
Cidale, Lydia Sonia
Díaz, M.
Pietrzyński, G.
Gieren, W.
Sabogal, B.
author Mennickent, R. E.
author_facet Mennickent, R. E.
Cidale, Lydia Sonia
Díaz, M.
Pietrzyński, G.
Gieren, W.
Sabogal, B.
author_role author
author2 Cidale, Lydia Sonia
Díaz, M.
Pietrzyński, G.
Gieren, W.
Sabogal, B.
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Binary stars
Early type stars
Evolution of stars
Mass loss
topic Binary stars
Early type stars
Evolution of stars
Mass loss
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 present the first spectroscopic data for a sample of the recently discovered blue double-periodic variables in the Magellanic Clouds. The optical spectrum of these objects is dominated by Balmer and helium absorption lines and a continuum with a blue or sometimes flat slope. Spectral classification yields B spectral types and luminosity classes mostly of type III. However, the Hβ absorption line is weaker than expected for the spectral classification in most objects. For two objects, OGLE 05060009-6855025 and OGLE 05195898-6917013 we obtained time-resolved spectroscopy, finding radial velocity variations consistent with binarity. Phasing the short-term photometric variability of these two systems with their spectroscopic ephemeris, we find that they can be interpreted as ellipsoidal variations of the brighter component in a close binary system. From the analysis of their short-term light curves and radial velocities, we estimate that the cooler component could be a B-type dwarf. Our findings support the hypothesis that double-periodic variables are close binary systems consisting of two B-type stars. The shorter periodicity in non-eclipsing systems should be the ellipsoidal variation of the more evolved component. Regarding the long-term periodicity, we find their origin in or around the brighter star, as the oscillations virtually disappear at primary eclipse. Their nature remains unknown, at the present time. We also report the discovery of three (two of them eclipsing) new double-periodic variables in the Large Magellanic Cloud. One of them shows a shortening of the long-term period by approximately 20 per cent in a couple of cycles, which coincides with an increase of the maximum oscillation brightness. © 2005 RAS.
Fil: Mennickent, R. E.. Universidad de Concepción; Chile
Fil: Cidale, Lydia Sonia. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Fil: Díaz, M.. Universidade de Sao Paulo; Brasil
Fil: Pietrzyński, G.. Uniwersytet Warszawski; Argentina. Universidad de Concepción; Chile
Fil: Gieren, W.. Universidad de Concepción; Chile
Fil: Sabogal, B.. Universidad de Concepción; Chile
description We present the first spectroscopic data for a sample of the recently discovered blue double-periodic variables in the Magellanic Clouds. The optical spectrum of these objects is dominated by Balmer and helium absorption lines and a continuum with a blue or sometimes flat slope. Spectral classification yields B spectral types and luminosity classes mostly of type III. However, the Hβ absorption line is weaker than expected for the spectral classification in most objects. For two objects, OGLE 05060009-6855025 and OGLE 05195898-6917013 we obtained time-resolved spectroscopy, finding radial velocity variations consistent with binarity. Phasing the short-term photometric variability of these two systems with their spectroscopic ephemeris, we find that they can be interpreted as ellipsoidal variations of the brighter component in a close binary system. From the analysis of their short-term light curves and radial velocities, we estimate that the cooler component could be a B-type dwarf. Our findings support the hypothesis that double-periodic variables are close binary systems consisting of two B-type stars. The shorter periodicity in non-eclipsing systems should be the ellipsoidal variation of the more evolved component. Regarding the long-term periodicity, we find their origin in or around the brighter star, as the oscillations virtually disappear at primary eclipse. Their nature remains unknown, at the present time. We also report the discovery of three (two of them eclipsing) new double-periodic variables in the Large Magellanic Cloud. One of them shows a shortening of the long-term period by approximately 20 per cent in a couple of cycles, which coincides with an increase of the maximum oscillation brightness. © 2005 RAS.
publishDate 2005
dc.date.none.fl_str_mv 2005-03
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/11336/38892
Mennickent, R. E.; Cidale, Lydia Sonia; Díaz, M.; Pietrzyński, G.; Gieren, W.; et al.; Revealing the nature of double-periodic blue variables in the Magellanic Clouds.; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 357; 4; 3-2005; 1219-1230
0035-8711
CONICET Digital
CONICET
url http://hdl.handle.net/11336/38892
identifier_str_mv Mennickent, R. E.; Cidale, Lydia Sonia; Díaz, M.; Pietrzyński, G.; Gieren, W.; et al.; Revealing the nature of double-periodic blue variables in the Magellanic Clouds.; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 357; 4; 3-2005; 1219-1230
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/url/http://adsabs.harvard.edu/abs/2005MNRAS.357.1219M
info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-2966.2005.08718.x
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 13.070432

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