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NEAR-CONTACT BINARIES WITH MASS TRANSFER: V473 CASSIOPEIAE AND II PERSEI
Zhu LY(朱俐颖)1,2; Qian SB(钱声帮)1,2; Zola, S3,4; Kreiner, JM3; Zhu, LY (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
发表期刊ASTRONOMICAL JOURNAL
2009-03
卷号137期号:3页码:3574-3580
DOI10.1088/0004-6256/137/3/3574
产权排序第1完成单位
收录类别SCI
关键词Binaries: Close Binaries: Eclipsing Stars: Evolution Stars: Individual (Ii Persei V473 Cassiopeiae)
摘要Photometric solutions of two short period close binaries, V473 Cas and II Per, are derived with the 2003 version Wilson-Van Hamme code. It is shown that V473 Cas is a semidetached system with the primary component or the secondary component at its critical Roche Lobe, while II Per is a marginal contact binary system with both components filling their critical Roche Lobes, but with a large temperature difference between the two components. Both systems belong to near-contact binaries with the light curves enhanced around the left shoulder of secondary minimum, which can be explained by hot spots on the secondary components due to the mass transfer via a stream hitting the facing surface of the secondary components. The orbital period investigations based on all available times of light minimum show a secular period existing in these two targets decreasing at the rate of dP/dt = -7.61 x 10(-8) days yr(-1) for V473 Cas and dP/dt = -7.54 x 10(-8) days yr(-1) for II Per. The decrease of the orbital period can be the result of mass transfer from the primary component to the secondary one, which is consistent with the asymmetric light curves of V473 Cas and II Per. Therefore, V473 Cas and II Per are other examples displaying evidence of mass transfer between the two components. We have collected NCBs with secular period variation and find that almost all SD1-type NCBs show decreasing periods and enhancing luminosity on the left shoulder of secondary minimum in their light curves. So the semidetached configuration with the lobe filling primary is more plausible for V473 Cas. Furthermore, the detected enhancing amplitude of luminosity for SD2-type NCBs is smaller than other types of NCBs, which implies that the mass transfer from the primary component to the secondary one is stronger than the transfer in opposite direction. With the orbital period decrease, V473 Cas and II Per will evolve into overcontact binaries with true thermal contact.
项目资助者Special Foundation of President ; West Light Foundation of the Chinese Academy of Sciences ; Yunnan Natural Science Foundation [2008CD157] ; National Key Fundamental Research Project [2007CB815406] ; Chinese Nature Science Foundation [10778707]
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-6256
URL查看原文
归档日期2009-02-24
WOS记录号WOS:000263719800013
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]URSAE MAJORIS SYSTEMS ; UBV PHOTOMETRY ; LIGHT CURVES ; STAR LIGHT ; CN ANDROMEDAE ; CANIS-MINORIS ; V432 PERSEI ; HL-AURIGAE ; PERIOD ; COMPONENTS
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5827
专题双星与变星研究组
通讯作者Zhu, LY (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
作者单位1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, People's Republic of China
2.United Laboratory of Optical Astronomy, Chinese Academy of Sciences (ULOAC), 100012 Beijing, People's Republic of China
3.Mt. Suhora Observatory of the Pedagogical University, ul. Podchorążych 2, 30-084 Krakow, Poland
4.Astronomical Observatory, Jagiellonian University, ul. Orla 171, 30-244, Krakow, Poland
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Zhu LY,Qian SB,Zola, S,et al. NEAR-CONTACT BINARIES WITH MASS TRANSFER: V473 CASSIOPEIAE AND II PERSEI[J]. ASTRONOMICAL JOURNAL,2009,137(3):3574-3580.
APA Zhu LY,Qian SB,Zola, S,Kreiner, JM,&Zhu, LY .(2009).NEAR-CONTACT BINARIES WITH MASS TRANSFER: V473 CASSIOPEIAE AND II PERSEI.ASTRONOMICAL JOURNAL,137(3),3574-3580.
MLA Zhu LY,et al."NEAR-CONTACT BINARIES WITH MASS TRANSFER: V473 CASSIOPEIAE AND II PERSEI".ASTRONOMICAL JOURNAL 137.3(2009):3574-3580.
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