The first photometric investigations of the G-type shallow contact binary IO Cnc |
| |
作者姓名: | 廖文萍 李临甲 周肖 王琪善 |
| |
作者单位: | Yunnan Observatories;Key Laboratory for the Structure and Evolution of Celestial Objects;Center for Astronomical Mega-Science;University of Chinese Academy of Sciences |
| |
基金项目: | supported by the National Natural Science Foundation of China(Grant Nos.11873017 and 11933008);the Science and Technology Talents and Platform Plan of Yunnan province(2018HB070);the Yunnan Natural Science Foundation(No.2018FB006);partially supported by the Open Project Program of the Key Laboratory of Optical Astronomy,National Astronomical Observatories,Chinese Academy of Sciences。 |
| |
摘 要: | IO Cnc was classified to be a new G-type(G0)W UMa-type eclipsing binary system.Our first multicolor photometric solutions show that IO Cnc is a new W-subtype shallow contact binary with a fill-out factor of f=16.1%and a low mass ratio of q=3.12(or 1/q=0.32).During orbital period investigations,a cyclic variation and a downward parabolic variation with a rate of(-1.28±0.43)×10-7 d yr-1 was discovered in the observed–calculated(O-C)curve.The cyclic variation was analyzed by the light travel time effect(LTTE)via a potential red dwarf companion star,an orbital semi-major axis shorter than 4.88±0.82 AU was obtained.Finally,we collect physical parameters of a sample of 50 G-type shallow contact binaries(f≤20%),it is suggested that most of the G-type shallow contact binaries are undergoing a longterm and periodic orbital period changes,especially more systems show long-term decreases.The long-term orbital period decrease indicates that IO Cnc is in a mass transferring from the more massive component to the less massive one.With the long-term decrease of the orbital period,this shallow contact binary will evolve into a deeper contact one.
|
关 键 词: | STARS BINARIES close-stars BINARIES eclipsing-stars individual(IOCnc)-stars solar-type-stars evolution |
本文献已被 维普 等数据库收录! |