2009ApJ...703..109D -
Astrophys. J., 703, 109-113 (2009/September-3)
Evidence of a brown dwarf in the eclipsing dwarf nova Z Chamaeleonis.
DAI Z., QIAN S. and FERNANDEZ LAJUS E.
Abstract (from CDS):
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.
Abstract Copyright:
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Journal keyword(s):
binaries: eclipsing - novae, cataclysmic variables - stars: individual: Z Chamaeleonis
Simbad objects:
2
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