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

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	Photometric investigations on two totally eclipsing contact binaries:V342 UMa and V509 Cam
	Kai Li 1; QiQi Xia 1; JinZhong Liu3 ; Yu Zhang3 ; Xing Gao 3; ShaoMing Hu 1; DiFu Guo 1; Xu Chen 1; Yuan Liu 4
	2019
Source Publication	天文和天体物理学研究：英文版
ISSN	1674-4527
Volume	19.0 Issue:010 Pages:75-86
Abstract	By analyzing two sets of complete BV Rc Ic light curves for V342 UMa and three sets of complete BV Rc Ic light curves for V509 Cam, we determined that the two systems are both W-subtype contact binaries and that V342 UMa manifests a shallow contact configuration, while V509 Cam exhibits a medium 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 other W-subtype contact systems.
Keyword	stars binaries close-stars eclipsing-stars individual (V342UMa, V509Cam)
Indexed By	CSCD
Language	英语
CSCD ID	CSCD:6600378
Citation statistics	Cited Times:6[CSCD] [CSCD Record]
Document Type	期刊论文
Identifier	http://ir.xao.ac.cn/handle/45760611-7/6494
Collection	中国科学院新疆天文台
Affiliation	1.山东大学 2.中国科学院 3.中国科学院新疆天文台 4.齐鲁理工学院
Recommended Citation GB/T 7714	Kai Li,QiQi Xia,JinZhong Liu,et al. Photometric investigations on two totally eclipsing contact binaries:V342 UMa and V509 Cam[J]. 天文和天体物理学研究：英文版,2019,19.0(010):75-86.
APA	Kai Li.,QiQi Xia.,JinZhong Liu.,Yu Zhang.,Xing Gao.,...&Yuan Liu.(2019).Photometric investigations on two totally eclipsing contact binaries:V342 UMa and V509 Cam.天文和天体物理学研究：英文版,19.0(010),75-86.
MLA	Kai Li,et al."Photometric investigations on two totally eclipsing contact binaries:V342 UMa and V509 Cam".天文和天体物理学研究：英文版 19.0.010(2019):75-86.

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