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Title:
Evidence of a Brown Dwarf in the Eclipsing Dwarf Nova Z Chamaeleonis
Authors:
Dai, Zhibin; Qian, Shengbang; Fernández Lajús, Eduardo
Affiliation:
AA(National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, China ; United Laboratory of Optical Astronomy, Chinese Academy of Science (ULOAC), 100012 Beijing, People's Republic of China ; Graduate School of the CAS, Beijing, People's Republic of China ; ), AB(National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, China ; United Laboratory of Optical Astronomy, Chinese Academy of Science (ULOAC), 100012 Beijing, People's Republic of China ), AC(Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata Paseo del Bosque s/n, 1900, La Plata, Pcia. Bs. As., Argentina)
Publication:
The Astrophysical Journal, Volume 703, Issue 1, pp. 109-113 (2009). (ApJ Homepage)
Publication Date:
09/2009
Origin:
IOP
ApJ Keywords:
binaries: eclipsing, novae, cataclysmic variables, stars: individual: Z Chamaeleonis
DOI:
10.1088/0004-637X/703/1/109
Bibliographic Code:
2009ApJ...703..109D

Abstract

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 gsim81.6%, which may be a plausible explanation of the periodic variation in the systemic velocity of Z Chamaeleonis in superoutburst.
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