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凤凰座大振幅脉动变星BL Cam的测光研究
Alternative TitleNew Photometric of High Amplitude SX Phe-tpe Star BL Cam
Thesis Advisor艾力·伊沙木丁
Degree Grantor中国科学院大学
Place of Conferral北京
Degree Name理学硕士
Degree Discipline天体物理
Keyword恒星,变星,δ Scuti stars:variables
AbstractBL Cam是属于星族II的一颗大振幅的δ Scuti型脉动变星,在赫罗图上这颗脉动变星位于主序和经典不稳定带的交叉处。BL Cam从被发现到现在一直都是研究的热点。我们使用南山1 米大视场光学望远镜在2014、2017和2018年对BLCam进行了测光观测。从2014年的光变曲线中除了探测到BL Cam的主脉动频率25.5790(3)cdE-1和它的两个谐波频率外,还探测到一个独立的非径向的脉动频率25.247 (2)cdE-1。从这三年的光变曲线中一共确定了123个光极大时刻,这些光极大时刻与以前文章中的光极大时刻一起用于分析O-C图来确定BL Cam的主脉动周期的变化率。在这个工作中我们确定的主周期的变化值为(1/P)(dP/dt)= - 2.39(8)×10E-8 yrE-1,这个值与其他人确定的主周期的变化率要低。并且O-C曲线的残差中存在一个14.01(9)年的周期性变化。如果是由光时效应引起的,BL Cam应该在一个双星系统中。第二天体的质量被限制在和褐矮星一样低的质量范围内。在我们的工作中并没有发现以前的研究者认为BL Cam应该在一个三体系统中的证据。
Other AbstractBL Cam is a pulsating variable of the high amplitude δ Scuti stars (HADS). And it is in the cross of the main sequence and the classical instability strip of the H-R diagram. We carried out photometric observations of the SX Phe star BL Cam in 2014. 2017 and 2018using Nanshan 1-m telescope. In addition to the dominated frequency of 25.5790(3) cdE-1 and its two harmonics, an independent frequency of 25.247(2) cdE-1, which is a nonradial mode frequency, was detected from the data in 2014.A total of 123 new times of light maxima were determined from our light curves in the threeyears, which, together with that published in the literature, were used to analyze the O-Cdiagram. The change rate of the main period was derived as(1/P)(dP/dt)=-2.39(8)×10E-8 yrE-1, which is lower than that published in previous literature.A periodical change with a period of 14.01(9) yr was found in the residuals of the O-C curve fitting. If it was caused by the light-time effect, BL Cam should be a binary system. The mass of the companion was restricted as low as that of a brown dwarf. No evidence of the triple system suggested by previous authors was shown in our analysis.
Document Type学位论文
First Author AffilicationXinjiang Astronomical Observatory, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
宗鹏. 凤凰座大振幅脉动变星BL Cam的测光研究[D]. 北京. 中国科学院大学,2019.
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