天文学进展2025，Vol.43Issue(1)：129-141,13.DOI:10.3969/j.issn.1000-8349.2025.01.08
相接双星LP UMa轨道周期变化研究的新进展
Progress of the Research on the Orbital Period Variation of the Contact Binary LP UMa
摘要
Abstract
LP UMa is a W UMa type binary star with a brightness of 13.34 mag in the g-band.It has been observed for over 25 years since its first observation in 1997,with nearly 400 records of minimum moments.Over the years,multiple researchers have used different data and methods to study it,and have come to different research conclusions.Eight new observations have been done for the contact binary LP UMa by ground-based optical telescopes from December 2022 to December 2023,resulting in 11 determined times of light minimum in this paper.130 and 35 times of light minimum were derived from the TESS database and the American Association of Variable Stars Observers(AAVSO)database respectively,with an additional 214 minimum moments from literatures.Based on the total of 390 minimum moments mentioned above,the orbital period change of LP UMa was restudied,revising the previous conclusion that the rapid increase in the orbital period of the system is due to rapid material transfer between the binary stars.This research indicates that the rapid increase in the orbital period of LP UMa is actually part of the periodic variation,most likely caused by the optical time orbit effect of a third celestial body.We calculated that the period of the third celestial body is about 41.7 years,and the orbital eccentricity is about 0.0701,confirming that LP UMa is highly likely a late-type connected binary system with a third celestial body.关键词
双星/LP UMa/O-C/第三天体/光时轨道效应Key words
binary/LP UMa/O-C/third body/light travel time effect分类
天文学引用本文复制引用
李迎港,郑捷,陈天禄,江林巧,鲍华,索南达吉,许超..相接双星LP UMa轨道周期变化研究的新进展[J].天文学进展,2025,43(1):129-141,13.基金项目
西藏大学研究生"高水平人才培养计划"(2021-GSP-S039),西藏大学中央财政支持地方高校改革发展资金(00060858,00060867-01,00061082) （2021-GSP-S039）
