首页|V0405 Dra:A New Deep and Low Mass Ratio Contact Binary with Extremely Fast Decrease in the Orbital Period

V0405 Dra:A New Deep and Low Mass Ratio Contact Binary with Extremely Fast Decrease in the Orbital Period

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V0405 Dra is a W UMa-type binary star.Based on the TESS data,we have conducted an orbital period study and performed a light curve analysis for the system.The orbital period study reveals that the O-C curve for V0405 Dra exhibits secular decrease at an extremely high rate of dP/dt=-2.71 x 10-6 day year-1,along with periodic variations characterized by an amplitude of A3=0.0032 day and a period of P3=1.413 years.The orbital periodic change is possibly due to the light-travel time effect resulting from an additional third body in the system,for which we estimate a minimum mass of M3=0.77M⊙.By employing the 2013 version of the Wilson-Devinney(W-D)method to synthesize a light curve,we derived photometric solutions indicating that V0405 Dra is a new deep(f=68.7％)and low-mass ratio(q=0.175)contact binary.The fast decrease in its orbital period is likely caused by mass transfer from the more massive primary star to the less massive secondary star,or due to angular momentum loss.With further mass transfer and loss of angular momentum,the binary will gradually evolve into a tighter contact configuration,eventually leading to a merger into a single star,following the evolutionary paths suggested for such deep and low mass ratio contact binaries.

(stars:)binaries(including multiple):close(stars:)binaries:eclipsingstars:individual(V0405 Dra)

Chao-Yue Li、Lin-Qiao Jiang、Jie Zheng、Yi-Man Liu、Xiao-Yu Long、Min Sun、Han-Lu Zhang、Xiao-Man Tian

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School of Science,Leshan Normal University,Leshan 614000,China

Center for Applied Optics Research,Leshan Normal University,Leshan 614000,China

Key Laboratory of Detection and Application of Space Effect in Southwest Sichuan,Leshan 614000,China

CAS Key Laboratory of Optical Astronomy,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China

School of Aeronautics,Shandong Jiaotong University,Jinan 250000,China

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Joint Research Fund in AstronomyChinese Academy of Sciences(CAS)Chinese National Natural Science Foundation of China(NSFC)

U1631108under a cooperative agreement between the National Natural Science Foundation of ChinaNSFC12103030

2024

10.1088/1674-4527/ad47dd

天文和天体物理学研究
中国科学院国家天文台

天文和天体物理学研究

CSTPCD
影响因子：0.406
ISSN：1674-4527
年,卷(期)：2024.24(6)