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Photometric investigation of the deep-contact binary V409 Hya
Na, WW1; Qian SB(钱声帮)2,3,4; Zhang, L1; Liao WP(廖文萍)2,3,4; Snoonthornthum, B5; Zhu LY(朱俐颖)2,3,4; Zhao EG(赵二刚)2,3,4; Zhou X(周肖)2,3,4
Source PublicationNEW ASTRONOMY
Contribution Rank第2完成单位
Indexed BySCI
KeywordStars: Binaries: Close Stars: Binaries: Eclipsing Stars: Individual (V409 Hya) Stars: Stellar Evolution

V409 Hya is a newly discovered W UMa-type binary star with a period of 0.47226 days. Complete light curves in V, 12,, and I bands are presented and analyzed with the W-D (Wilson and Devinney) method. It is discovered that V409 Hya is a deep contact binary with a contact degree of integral = 60.6(+/- 1.4)%. It is an A-type, low-mass-ratio contact binary with a mass ratio of 0.22. The derived orbital inclination (i = 89.8 degrees) indicates that it is a total eclipsing binary and the determined parameters are reliable. By combining several determined times of light minimum with the others compiled from the literature, the period changes of V409 Hya were investigated. The general trend of the (O-C) curve reveals that the period of the binary is increasing continuously at a rate of dP/dt = +5.41(+/- 0.06) x 10(-7) days/year. The continuous period increase can be explained by a mass transfer from the secondary to the primary. As the matter is being transferred, the mass ratio of the binary system is decreasing. After it meets the more familiar criterion that the orbital angular momentum is less than 3 times the total spin angular momentum, the deep contact binary may finally evolve into a rapid-rotating single star. (c) 2014 Published by Elsevier B.V.

Funding ProjectChinese Natural Science Foundation[11133007] ; Chinese Natural Science Foundation[11325315]
Funding OrganizationChinese Natural Science Foundation[11133007, 11325315]
Subject Area天文学 ; 恒星与银河系 ; 恒星天文学 ; 恒星形成与演化
MOST Discipline Catalogue理学 ; 理学::天文学
Publication PlacePO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
WOS IDWOS:000333493100013
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
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Document Type期刊论文
Corresponding AuthorQian SB(钱声帮)
Affiliation1.Department of Physics, Yunnan University, 2, Cui Hubei road, 650091 Kunming, Yunnan province, China
2.Yunnan Astronomical Observatory, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, China
3.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, China
4.University of the Chinese Academy of Sciences, Beijing 100049, China
5.National Astronomical Research Institute of Thailand, 191 Siriphanich Bldg., Huay Kaew Rd., Chiang Mai 50200, Thailand
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Na, WW,Qian SB,Zhang, L,et al. Photometric investigation of the deep-contact binary V409 Hya[J]. NEW ASTRONOMY,2014,30:105-108.
APA Na, WW.,Qian SB.,Zhang, L.,Liao WP.,Snoonthornthum, B.,...&Zhou X.(2014).Photometric investigation of the deep-contact binary V409 Hya.NEW ASTRONOMY,30,105-108.
MLA Na, WW,et al."Photometric investigation of the deep-contact binary V409 Hya".NEW ASTRONOMY 30(2014):105-108.
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