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Period studies and photometric models for two EB-type binaries EU Hya and AW Vul
Yang Yuangui1; Li Qun1; Li Huali2; Dai Haifeng1
2016
Source PublicationResearch in Astronomy and Astrophysics
ISSN1674-4527
Volume16Issue:2Pages:35
AbstractNew photometry for two Algol-type binaries, EU Hya (P = 0.7782 d) and AW Vul (P = 0.8065 d), was carried out using the 60-cm telescope at Xinglong station of National Astronomical Observatories, Chinese Academy of Sciences. With the updated Wilson-Devinney code, photometric elements were derived from the multi-color light curves. The modeled results indicate that the two systems are near-contact binaries, whose secondary components fill their Roche lobes. The fill-out factors of the primaries are f_p = 81.2 (±0.2)% for EU Hya and f_p = 82.4 (±0.3)%for AWVul. Period analysis implies that there exists a downward parabola with a light-time orbit from the (O –C) curve. This kind of periodic oscillation may be attributed to the light-time orbit effect of a third companion. The long-term period decrease may be caused by mass and angular momentum loss. When the orbital period decreases, the fill-out factor of f_p will increase. Our results indicate that the primaries will also eventually fill their Roche lobes. EU Hya and AW Vul may possibly evolve from semi-detached binaries into contact ones.
Language英语
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/48493
Collection中国科学院国家天文台
Affiliation1.淮北师范大学信息学院
2.中国科学院国家天文台
Recommended Citation
GB/T 7714
Yang Yuangui,Li Qun,Li Huali,et al. Period studies and photometric models for two EB-type binaries EU Hya and AW Vul[J]. Research in Astronomy and Astrophysics,2016,16(2):35.
APA Yang Yuangui,Li Qun,Li Huali,&Dai Haifeng.(2016).Period studies and photometric models for two EB-type binaries EU Hya and AW Vul.Research in Astronomy and Astrophysics,16(2),35.
MLA Yang Yuangui,et al."Period studies and photometric models for two EB-type binaries EU Hya and AW Vul".Research in Astronomy and Astrophysics 16.2(2016):35.
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