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Orbital parameters and period variation studies of the short-period eclipsing binaries FG sct, VZ Lib and VZ Psc

Research in Astronomy and Astrophysics 2019年第7期19卷 67-86页

作者： Qiang Yue Li-Yun Zhang Xian-Ming L.Han Hong-Peng Lu Liu Long Yan Yan College of Physics/Department of Physics and Astronomy & Guizhou Provincial Key Laboratory of Public Big Data Guizhou UniversityGuiyang 550025China CAS Key Laboratory of Solar Activity National Astronomical ObservatoriesBeijing 100101China Department of Physics and Astronomy Butler UniversityIndianapolisIN 4620& USA National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China

We present eight sets of new light curves for binaries FG sct,VZ Lib and VZ Psc,which are all contact eclipsing binaries with short orbital *** carried out our observations from 2016 to 2017 using the 60-cm telescope administered by National Astronomical Observatories,Chinese Academy of Sciences,the Holcomb Observatory at Butler University and the SARA-CT telescope in *** firstly determined the orbital parameters of FG sct using the O-C method and obtained photometric solutions utilizing the updated W-D *** also studied its period variation and discovered that its orbital period is decreasing at a rate of 6.39(±0.24)×10^-8 d yr-1,which was likely caused by mass transfer from the primary component to the secondary component or angular momentum interchange between the two components via magnetic *** VZ Lib and VZ Psc,we simultaneously analyzed their BV RI light curves in conjunction with the published radial *** order to obtain the orbital parameters of VZ Lib,we also analyzed its period variation and revised cyclic change,which could be attributed to either the light-time effect due to a tertiary companion or magnetic activity cycle *** derived the periods of the tertiary component of VZ Lib to be 48.7(±0.1) yr or magnetic cycle to be 46.9(±1.9) *** emission lines at Ca II H+K,Hα,Hβ,Hγ and Ca II IRT were detected in the LAMOST spectra of VZ Psc,which imply chromospheric activities in this binary system.

关键词： stars:binaries:eclipsing stars:individual (FG sct, VZ Lib, VZ Psc) stars:starspot

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