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Photometric investigations on two totally eclipsing contact binaries: V342 UMa and V509 Cam

Li Kai ^1,2 Xia Qiqi ¹ Liu Jinzhong ³ Zhang Yu ³ Gao Xing ³ Hu Shaoming ¹ Guo Difu ¹ Chen Xu ¹ Liu Yuan ⁴

文摘	By analyzing two sets of complete BV R_cI_c light curves for V342 UMa and three sets of complete BV RcIc light curves for V509Cam, we determined that the two systems are bothW-subtype contact binaries and that V342 UMamanifests a shallow contact configuration,while V509 Cam exhibits amedium contact configuration.Given that both of them are totally eclipsing binaries, the physical parameters derived only by the photometric light curves are reliable. Meanwhile, the period changes of the two targets were analyzed based on all available eclipsing times.We discovered that V342 UMa shows long-term period decrease with a rate of –1.02(±0.54) × 10~(–7) d yr~(–1) and that V509 Cam displays long-term period increase with a rate of 3.96(±0.90)×10~(–8) d yr~(–1). Both the conservative mass transfer and angular momentum loss via magnetic stellar winds can be used to interpret the long-term period decrease of V342 UMa. The longterm period increase of V509 Cam can be explained by mass transfer from the less massive star to the more massive one. The absolute parameters of the two binaries were estimated according to their Gaia distances and our derived photometric solution results. This method can be extended to other contact binaries without radial velocities but with reliable photometric solutions. Their evolutionary states were investigated and we found that they reveal properties that are identical to otherW-subtype contact systems.
来源	Research in Astronomy and Astrophysics ,2019,19(10):147 【核心库】
DOI	10.1088/1674–4527/19/10/147
关键词	stars: binaries: close ; stars: binaries: eclipsing ; stars: individual (V342UMa, V509Cam)
地址	1. Institute of Space Sciences, Shandong University, Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Weihai, 264209 2. Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, 650216 3. Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi, 830011 4. Qilu Institute of Technology, Ji'nan, 250200
语种	英文
文献类型	研究性论文
ISSN	1674-4527
学科	天文学
基金	国家自然科学基金 ; the Joint Research Fund in Astronomy ; National Natural Science Foundation of China and the Chinese Academy of Sciences, the program of the Light in China's Western Region ; 山东省自然科学基金 ; the Young Scholars Program of Shandong University, Weihai ; the program of Tianshan Youth ; the Open Research Program of Key Laboratory for the Structure and Evolution of Celestial Objects
文献收藏号	CSCD:6600378

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引证文献 6 篇

1 Guo Yani The first photometric investigation of the contact binary OQ Cam Research in Astronomy and Astrophysics,2020,20(11):179
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2 Zhou Xiao Orbital period correction and light curve modeling of the W-subtype shallow contact binary OW Leo Research in Astronomy and Astrophysics,2021,21(2):27
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