Evidence of a brown dwark in the eclipsing dwarf nova Z Chamaeleonis

Autores
Dai, Zhibin; Qian, Shengbang; Fernandez Lajus, Eduardo Eusebio
Año de publicación
2009
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We presented three new CCD observations of light minima of Z Chamaeleonis. All 187 available times of light minimum including 37 photographic data are compiled, and a new orbital period analysis is made by means of the standard O − C technique. The O − C diagram of Z Chamaeleonis presents a cyclical periodic change of ∼ 32.57 yr with a high significance level. We attempted to apply two plausible mechanisms (i.e., Applegate’s mechanism and light travel-time effect) to explain the cyclical variations of orbital period shown in the O–C diagram. Although the previous works suggested that solar-type magnetic cycles in the red dwarf are the best explanation, the analysis of Applegate’s mechanism in this paper presents a negative result. Accordingly, a light travel-time effect is proposed, and a brown dwarf as a tertiary component orbiting around dwarf nova Z Chamaeleonis is derived with a significance level of 81.6%, which may be a plausible explanation of the periodic variation in the systemic velocity of Z Chamaeleonis in superoutburst.
Fil: Dai, Zhibin. Chinese Academy of Sciences; República de China
Fil: Qian, Shengbang. Chinese Academy of Sciences; República de China
Fil: Fernandez Lajus, Eduardo Eusebio. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Materia
Eclipsing binaries
Novae
Cataclysmic variables
Z Chamaeleonis (estrella)
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:11336/42813
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/42813
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Evidence of a brown dwark in the eclipsing dwarf nova Z ChamaeleonisDai, ZhibinQian, ShengbangFernandez Lajus, Eduardo EusebioEclipsing binariesNovaeCataclysmic variablesZ Chamaeleonis (estrella)https://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We presented three new CCD observations of light minima of Z Chamaeleonis. All 187 available times of light minimum including 37 photographic data are compiled, and a new orbital period analysis is made by means of the standard O − C technique. The O − C diagram of Z Chamaeleonis presents a cyclical periodic change of ∼ 32.57 yr with a high significance level. We attempted to apply two plausible mechanisms (i.e., Applegate’s mechanism and light travel-time effect) to explain the cyclical variations of orbital period shown in the O–C diagram. Although the previous works suggested that solar-type magnetic cycles in the red dwarf are the best explanation, the analysis of Applegate’s mechanism in this paper presents a negative result. Accordingly, a light travel-time effect is proposed, and a brown dwarf as a tertiary component orbiting around dwarf nova Z Chamaeleonis is derived with a significance level of 81.6%, which may be a plausible explanation of the periodic variation in the systemic velocity of Z Chamaeleonis in superoutburst.Fil: Dai, Zhibin. Chinese Academy of Sciences; República de ChinaFil: Qian, Shengbang. Chinese Academy of Sciences; República de ChinaFil: Fernandez Lajus, Eduardo Eusebio. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; ArgentinaIOP Publishing2009-09info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/42813Dai, Zhibin; Qian, Shengbang; Fernandez Lajus, Eduardo Eusebio; Evidence of a brown dwark in the eclipsing dwarf nova Z Chamaeleonis; IOP Publishing; Astrophysical Journal; 703; 1; 9-2009; 109-1130004-637XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1088/0004-637X/703/1/109info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1088/0004-637X/703/1/109/metainfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T10:05:04Zoai:ri.conicet.gov.ar:11336/42813instacron: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:34982025-09-03 10:05:04.521CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Evidence of a brown dwark in the eclipsing dwarf nova Z Chamaeleonis
title Evidence of a brown dwark in the eclipsing dwarf nova Z Chamaeleonis
spellingShingle Evidence of a brown dwark in the eclipsing dwarf nova Z Chamaeleonis
Dai, Zhibin
Eclipsing binaries
Novae
Cataclysmic variables
Z Chamaeleonis (estrella)
title_short Evidence of a brown dwark in the eclipsing dwarf nova Z Chamaeleonis
title_full Evidence of a brown dwark in the eclipsing dwarf nova Z Chamaeleonis
title_fullStr Evidence of a brown dwark in the eclipsing dwarf nova Z Chamaeleonis
title_full_unstemmed Evidence of a brown dwark in the eclipsing dwarf nova Z Chamaeleonis
title_sort Evidence of a brown dwark in the eclipsing dwarf nova Z Chamaeleonis
dc.creator.none.fl_str_mv Dai, Zhibin
Qian, Shengbang
Fernandez Lajus, Eduardo Eusebio
author Dai, Zhibin
author_facet Dai, Zhibin
Qian, Shengbang
Fernandez Lajus, Eduardo Eusebio
author_role author
author2 Qian, Shengbang
Fernandez Lajus, Eduardo Eusebio
author2_role author
author
dc.subject.none.fl_str_mv Eclipsing binaries
Novae
Cataclysmic variables
Z Chamaeleonis (estrella)
topic Eclipsing binaries
Novae
Cataclysmic variables
Z Chamaeleonis (estrella)
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 presented three new CCD observations of light minima of Z Chamaeleonis. All 187 available times of light minimum including 37 photographic data are compiled, and a new orbital period analysis is made by means of the standard O − C technique. The O − C diagram of Z Chamaeleonis presents a cyclical periodic change of ∼ 32.57 yr with a high significance level. We attempted to apply two plausible mechanisms (i.e., Applegate’s mechanism and light travel-time effect) to explain the cyclical variations of orbital period shown in the O–C diagram. Although the previous works suggested that solar-type magnetic cycles in the red dwarf are the best explanation, the analysis of Applegate’s mechanism in this paper presents a negative result. Accordingly, a light travel-time effect is proposed, and a brown dwarf as a tertiary component orbiting around dwarf nova Z Chamaeleonis is derived with a significance level of 81.6%, which may be a plausible explanation of the periodic variation in the systemic velocity of Z Chamaeleonis in superoutburst.
Fil: Dai, Zhibin. Chinese Academy of Sciences; República de China
Fil: Qian, Shengbang. Chinese Academy of Sciences; República de China
Fil: Fernandez Lajus, Eduardo Eusebio. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
description We presented three new CCD observations of light minima of Z Chamaeleonis. All 187 available times of light minimum including 37 photographic data are compiled, and a new orbital period analysis is made by means of the standard O − C technique. The O − C diagram of Z Chamaeleonis presents a cyclical periodic change of ∼ 32.57 yr with a high significance level. We attempted to apply two plausible mechanisms (i.e., Applegate’s mechanism and light travel-time effect) to explain the cyclical variations of orbital period shown in the O–C diagram. Although the previous works suggested that solar-type magnetic cycles in the red dwarf are the best explanation, the analysis of Applegate’s mechanism in this paper presents a negative result. Accordingly, a light travel-time effect is proposed, and a brown dwarf as a tertiary component orbiting around dwarf nova Z Chamaeleonis is derived with a significance level of 81.6%, which may be a plausible explanation of the periodic variation in the systemic velocity of Z Chamaeleonis in superoutburst.
publishDate 2009
dc.date.none.fl_str_mv 2009-09
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/11336/42813
Dai, Zhibin; Qian, Shengbang; Fernandez Lajus, Eduardo Eusebio; Evidence of a brown dwark in the eclipsing dwarf nova Z Chamaeleonis; IOP Publishing; Astrophysical Journal; 703; 1; 9-2009; 109-113
0004-637X
CONICET Digital
CONICET
url http://hdl.handle.net/11336/42813
identifier_str_mv Dai, Zhibin; Qian, Shengbang; Fernandez Lajus, Eduardo Eusebio; Evidence of a brown dwark in the eclipsing dwarf nova Z Chamaeleonis; IOP Publishing; Astrophysical Journal; 703; 1; 9-2009; 109-113
0004-637X
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1088/0004-637X/703/1/109
info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1088/0004-637X/703/1/109/meta
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 IOP Publishing
publisher.none.fl_str_mv IOP Publishing
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 13.13397

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