PHOTOMETRIC PROPERTIES FOR SELECTED ALGOL-TYPE BINARIES. IV. AV HYDRAE AND DZ CASSIOPEIAE

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	PHOTOMETRIC PROPERTIES FOR SELECTED ALGOL-TYPE BINARIES. IV. AV HYDRAE AND DZ CASSIOPEIAE
	Yang, Y. -G.1,3; Li, L. -H.2; Dai, H. -F.1,3
刊名	ASTRONOMICAL JOURNAL
	2012-08
卷号	144 期号:2
关键词	binaries: close binaries: eclipsing stars: individual (AV Hydrae DZ Cassiopeiae)
ISSN号	0004-6256
通讯作者	Yang, YG (reprint author), Huaibei Normal Univ, Sch Phys & Elect Informat, Huaibei 235000, Anhui, Peoples R China.
英文摘要	We present BVR photometric observations and several eclipsing times for AV Hya and DZ Cas from 2004 to 2011. Using the Wilson-Devinney method, the photometric solutions with hot spots were deduced from their asymmetric light curves. The results indicate that both stars are Algol-type binaries, whose mass ratio, q(ph), and fill-out factor of the primary, f(1), are q(ph) = 0.255(+/- 0.002) and f(1) = 81.2(+/- 0.2)% for AV Hya, and q(ph) = 0.093(+/- 0.003) and f(1) = 98.7(+/- 0.3)% for DZ Cas. Based on all available light minimum times, it is discovered that the O-C curve of each star could be described by a light-time orbit overlying on a downward parabola. Their periods and amplitudes are P-3 = 37.2(+/- 0.7) yr and A = 0.(d)0095(+/- 0.(d)0006) for AV Hya, and P-3 = 62.5(+/- 1.0) yr andA = 0.(d)0183(+/- 0.(d)0007) for DZ Cas. Cyclic variations may result from the light-time effect due to the third body. The secular period decrease rates are dP/dt = -1.47(+/- 0.04) x 10(-7) days yr(-1) for AV Hya and dP/dt = -0.92(+/- 0.04) x 10(-7) days yr(-1) for DZ Cas. This may be interpreted using mass and angular momentum loss from the system. With decreasing period, the fill-out factor of the primary increases and it may finally fill its inner Roche lobe. Therefore, AV Hya and DZ Cas with a secular period decrease will evolve from semi-detached configurations into contact ones.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	ORBITAL PERIOD MODULATION ; LIGHT CURVES ; CATALOG ; SYSTEMS ; STARS ; MASS
收录类别	SCI
原文出处	http://iopscience.iop.org/article/10.1088/0004-6256/144/2/50/meta
语种	英语
WOS记录号	WOS:000306596600021
公开日期	2016-06-01
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/9426]
专题	云南天文台_中国科学院天体结构与演化重点实验室
作者单位	1.School of Physics and Electronic Information, Huaibei Normal University, 235000 Huaibei, Anhui Province, China 2.National Astronomical Observatories, Chinese Academy of Sciences, 100012 Beijing, China 3.Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 650011 Kunming, China
推荐引用方式 GB/T 7714	Yang, Y. -G.,Li, L. -H.,Dai, H. -F.. PHOTOMETRIC PROPERTIES FOR SELECTED ALGOL-TYPE BINARIES. IV. AV HYDRAE AND DZ CASSIOPEIAE[J]. ASTRONOMICAL JOURNAL,2012,144(2).
APA	Yang, Y. -G.,Li, L. -H.,&Dai, H. -F..(2012).PHOTOMETRIC PROPERTIES FOR SELECTED ALGOL-TYPE BINARIES. IV. AV HYDRAE AND DZ CASSIOPEIAE.ASTRONOMICAL JOURNAL,144(2).
MLA	Yang, Y. -G.,et al."PHOTOMETRIC PROPERTIES FOR SELECTED ALGOL-TYPE BINARIES. IV. AV HYDRAE AND DZ CASSIOPEIAE".ASTRONOMICAL JOURNAL 144.2(2012).