On the Period Variation of the W UMa-type
Contact Binary V502 Ophiuchi
Qing-Yao Liu;Yu-Lan Yang
【期刊名称】《天文和天体物理学研究》 【年(卷),期】2006(006)003
【摘要】The variation in the orbital period of the W UMa type contact binary V502 Oph is analyzed. The orbital period exhibits a wavelike variation with a periodicity of 23.0 years and an amplitude ofΔP=1.24×10-6
days
superimposed
on
secular
decrease
of
dP/dt=1.68×10-7 day per year. The long-term decrease may be accompanied by the contraction of the secondary at a rate of 83 m per year and a mass transfer rate from the primary to the secondary of 4.28×10-8M⊙ per year. The short-term oscillation may be explained by the presence of a third component. Orbital elements of the third body and its possible mass are presented. 【总页数】7页(331-337)
【关键词】stars: contact binary - period change - star: individual: V502 Oph
【作者】Qing-Yao Liu;Yu-Lan Yang
【作者单位】National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011;National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences,
On the Period Variation of the W UMa-type Contact Binary V502 Ophiuchi
