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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
Source PublicationASTRONOMICAL JOURNAL
2012-08
Volume144Issue:2
DOI10.1088/0004-6256/144/2/50
Indexed BySCI
Keywordbinaries: close binaries: eclipsing stars: individual (AV Hydrae, DZ Cassiopeiae)
Abstract

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.

Funding ProjectNational Natural Science Foundation of China[10778707] ; National Natural Science Foundation of China[10978010] ; National Natural Science Foundation of China[11133007] ; Anhui Provincial Natural Science Foundation[1208085MA04] ; Excellent Young Talents in the Higher Education Institutions of Annui Province[2011 SQRL071] ; Key Laboratory for the Structure and Evolution of Celestial Objects[OP201110]
Funding OrganizationNational Natural Science Foundation of China[10778707, 10978010, 11133007] ; Anhui Provincial Natural Science Foundation[1208085MA04] ; Excellent Young Talents in the Higher Education Institutions of Annui Province[2011 SQRL071] ; Key Laboratory for the Structure and Evolution of Celestial Objects[OP201110]
Language英语
Subject Area天文学 ; 恒星与银河系 ; 恒星天文学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-6256
URL查看原文
WOS IDWOS:000306596600021
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordORBITAL PERIOD MODULATION ; LIGHT CURVES ; CATALOG ; SYSTEMS ; STARS ; MASS
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/9426
Collection中国科学院天体结构与演化重点实验室
Corresponding AuthorYang, Y. -G.
Affiliation1.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
Recommended Citation
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).
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