W UMa型食双星GM Bootis测光研究  

Photometric Study of W UMa type Eclipsing Binary GM Bootis

作　　者：杨勇 张燕平[1] 付建宁[1] 苍天启 

机构地区：[1]北京师范大学天文系,北京100875

出　　处：《天文研究与技术》2018年第1期17-24,共8页Astronomical Research & Technology

基　　金：国家自然科学基金(11673003);国家重点基础研究发展计划(973计划)(2014CB845700;2013CB834900)资助

摘　　要：GM Boo是一个已经被发现超过10年的短周期(约0.36天)相接双星。获得了GM Boo在2010到2015年新观测的多波段时序测光数据及其低色散光谱。从光变曲线中提取了19个新的光变极小时刻,并结合历史数据推导出该双星轨道周期增长速率d P/dt=1.06×10^(-7)d·y r^(-1)。Wilson-Devinney程序被用来分析GM Boo的测光轨道解。得出它是一个典型的W次型的过相接双星系统,其质量比约为q^1.22,相接度约为f^11%。模型中添加了2个黑子拟合不对称的光变曲线,说明此系统具有较强的活动性。GM Boo is a short period （-0.36days） contact binary system discovered for over 10 years. In this work, new multi-color photometric light curves from 2010 to 2015 and low-resolution spectra of GM Boo are obtained. We extracted 19 new eclipse timings of GM Boo from the light curves, deriving a long-term increasing rate of the orbital period dP/dt = 1.06 × 10^-7d · y r^-1 combined with historical data. Photometric solution is derived with the Wilson-Devinney Code, which shows that GM Boo is a typical W-type contact binary with mass ratio of q-1. 22 and contact degree of -11%. Two cool spots are assumed in the model in order to fit the asymmetrical light curves, which indicate that GM Boo is an active system.

关 键 词：食双星 轨道周期 光变曲线 

分 类 号：P144[天文地球—天体物理]