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ORBITAL PERIOD CHANGES AND THEIR EVOLUTIONARY STATUS FOR THE WEAK-CONTACT BINARIES. III. AO CAMELOPARDALIS AND AH TAURI
Yang, Y. -G.1,2; Wei, J. -Y.2; Kreiner, J. M.3; Li, H. -L.2
2010
Source PublicationASTRONOMICAL JOURNAL
Volume139Issue:1Pages:195-204
AbstractIn this paper, we presented multicolor photometric observations for two eclipsing binaries, AO Camelopardalis and AH Tauri, obtained on 2008 December 16 and 17. Using the Wilson-Devinney Code, the photometric solution of AH Tau was determined from our new CCD data. The mass ratio and the fill-out factor are q = 0.503(+/-0.003) and f = 10.8%(+/-0.1%), respectively. This indicates that AH Tau is in weak contact. For the weak-contact binary AO Cam, BVI light curves clearly show a difference in the heights of the maxima (i.e., the O'Connell effect), which may be explained by spot activity. By analyzing the O-C curves for AO Cam and AH Tau, it is found that the orbital periods appear to show a secular period decrease with a cyclic variation. The observed period modulation is Delta P/P similar to 10(-6). For AO Cam, the cyclic oscillation with a short period of 7.63(+/-0.07) yr and a low amplitude of 0(d).0019(+/-0(d).0003) may be preferably attributed to the cyclic magnetic activity. The period and amplitude of the cyclic variation for AH Tau are 45.8(+/-1.1) yr and 0(d).0171(+/-0(d).0005), which may more likely result from the light-time effect via a third body. The secular period decrease rates are dP/dt = -1.26(+/-0.04) x 10(-7) days yr(-1) for AO Cam and dP/dt = -6.98(+/-0.07) x 10(-8) days yr(-1) for AH Tau. This kind of period decrease can be plausibly explained by the mass transfer from the primary to the secondary, and may result in the system evolving into a deep contact configuration.
KeywordBinaries: Close Binaries: Eclipsing Stars: Individual (Ah Tauri Ao Camelopardalis)
DOI10.1088/0004-6256/139/1/195
Indexed BySCI
Language英语
WOS IDWOS:000272610200015
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/7757
Collection空间科学研究部
Affiliation1.Huaibei Coal Ind Teachers Coll, Sch Phys & Elect Informat, Huaibei 235000, Anhui Province, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
3.Cracow Pedag Univ, Mt Suhora Astron Observ, PL-30084 Krakow, Poland
Recommended Citation
GB/T 7714
Yang, Y. -G.,Wei, J. -Y.,Kreiner, J. M.,et al. ORBITAL PERIOD CHANGES AND THEIR EVOLUTIONARY STATUS FOR THE WEAK-CONTACT BINARIES. III. AO CAMELOPARDALIS AND AH TAURI[J]. ASTRONOMICAL JOURNAL,2010,139(1):195-204.
APA Yang, Y. -G.,Wei, J. -Y.,Kreiner, J. M.,&Li, H. -L..(2010).ORBITAL PERIOD CHANGES AND THEIR EVOLUTIONARY STATUS FOR THE WEAK-CONTACT BINARIES. III. AO CAMELOPARDALIS AND AH TAURI.ASTRONOMICAL JOURNAL,139(1),195-204.
MLA Yang, Y. -G.,et al."ORBITAL PERIOD CHANGES AND THEIR EVOLUTIONARY STATUS FOR THE WEAK-CONTACT BINARIES. III. AO CAMELOPARDALIS AND AH TAURI".ASTRONOMICAL JOURNAL 139.1(2010):195-204.
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