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

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...

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Autores principales: Dai, Zhibin, Qian, Shengbang, Fernández Lajús, Eduardo
Formato: Articulo
Lenguaje:Inglés
Publicado: 2009
Materias:
Ciencias Astronómicas
Binaries:eclipsing
Cataclysmic variables
Novae
Stars:individual (Z Chamaeleonis)
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/82785
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-82785
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Binaries:eclipsing
Cataclysmic variables
Novae
Stars:individual (Z Chamaeleonis)
spellingShingle Ciencias Astronómicas
Binaries:eclipsing
Cataclysmic variables
Novae
Stars:individual (Z Chamaeleonis)
Dai, Zhibin
Qian, Shengbang
Fernández Lajús, Eduardo
Evidence of a brown dwarf in the eclipsing dwarf nova Z Chamaeleonis
topic_facet Ciencias Astronómicas
Binaries:eclipsing
Cataclysmic variables
Novae
Stars:individual (Z Chamaeleonis)
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.
format Articulo
Articulo
author Dai, Zhibin
Qian, Shengbang
Fernández Lajús, Eduardo
author_facet Dai, Zhibin
Qian, Shengbang
Fernández Lajús, Eduardo
author_sort Dai, Zhibin
title Evidence of a brown dwarf in the eclipsing dwarf nova Z Chamaeleonis
title_short Evidence of a brown dwarf in the eclipsing dwarf nova Z Chamaeleonis
title_full Evidence of a brown dwarf in the eclipsing dwarf nova Z Chamaeleonis
title_fullStr Evidence of a brown dwarf in the eclipsing dwarf nova Z Chamaeleonis
title_full_unstemmed Evidence of a brown dwarf in the eclipsing dwarf nova Z Chamaeleonis
title_sort evidence of a brown dwarf in the eclipsing dwarf nova z chamaeleonis
publishDate 2009
url http://sedici.unlp.edu.ar/handle/10915/82785
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AT qianshengbang evidenceofabrowndwarfintheeclipsingdwarfnovazchamaeleonis
AT fernandezlajuseduardo evidenceofabrowndwarfintheeclipsingdwarfnovazchamaeleonis
bdutipo_str Repositorios
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