Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jkas...43..201h&link_type=abstract
Journal of the Korean Astronomical Society, vol. 43, no. 6, pp. 201-211
Astronomy and Astrophysics
Astronomy
1
Binaries: Close, Binaries: Eclipsing, Stars: Individual (V839 Oph), Stars: Late A-Class W Uma Type, Period Variation: Magnetic Activity
Scientific paper
All the available times of mid-eclipse in the literatures have been collected. Analyses of the data indicate a period increase of 3.2 × 10^{-7} day \cdot yr^{-1}. This period increase of V839 Oph can be interpreted in terms of mass transfer of rate 1.76 × 10^{-7} M_{&sun;} \cdot yr^{-1},from the less to the more massive component. The O-C diagram shows a damping sine wave covering, according to the data set of minima time, two different complete cycles of 36.73 yr and 19.93 yr with amplitudes approximately equal to 0.0080 and 0.0043 day, respectively. The third cycle has to be expected to cover about 13.5 years with lower amplitude than those of the former two cycles. These unequal duration cycles show a non periodicity which claims the explanation of tertiary of the system. While, strongly suggest a cycling magnetic activity due to star spots. From the point of view of the magnetic activity, the obtained characteristics are in good consistent when applying Applegate (1992) mechanism.
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