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Improved astrophysical parameters for the overcontact binary FG Hydrae
Qian SB(钱声帮)1,2; Yang YG(杨远贵)1,2; Qian, SB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2005-01-11
卷号356期号:2页码:765-772
DOI10.1111/j.1365-2966.2004.08497.x
产权排序第1完成单位
收录类别SCI
关键词Binaries : Close Stars : Evolution Stars : Individual : Fg Hydrae Stars : Magnetic Fields Stars : Mass-loss
摘要Photometric data on FG Hya obtained in 2002 and 2004 are presented. Three data sets show the exchange between A-type, W-type and the variable O'Connell effects. The photometric mass ratio (q = 0.1115 +/- 0.0003) derived from B and V light curves is almost the same as the spectroscopic mass ratio (q(sp) = 0.112 +/- 0.004). The new photometric solutions reveal that FG Hya is a deep overcontact binary system ( f = 85.6 +/- 1.8 per cent) with a spotted massive component. A period investigation, based on all available photoelectric or CCD times of light minimum, shows that the O-C curve of FG Hya can be explained as a combination of a secular period decrease and a cyclic variation with a period of 36.4 yr and an amplitude of 0.0289 d. By comparing the variation of the depth of the primary minimum with the change of the cyclic period, it is discovered that both of them may vary with the same cycle length of 36.4 yr and in the same phase. The variation of the light curve, the spotted primary component and the connection between the cyclic period change and the depth of the primary minimum, all may suggest that the G0-type component displays solar-type magnetic activity with a 36.4-yr cycle length. The long-time period decrease is interpreted by mass transfer from the more massive component to the less massive one or/and angular momentum loss due to mass outflow from the outer Lagrangian point.
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0035-8711
URL查看原文
归档日期2004-12-28
WOS记录号WOS:000225949200033
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]URSAE MAJORIS SYSTEMS ; ORBITAL PERIOD MODULATION ; CONTACT BINARIES ; MAGNETIC CYCLES ; LIGHT VARIATION ; CLOSE BINARIES ; AM LEONIS ; STARS ; PHOTOMETRY ; ELEMENTS
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5782
专题双星与变星研究组
通讯作者Qian, SB (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, PO Box 110, 650011 Kunming, China
2.United Laboratory of Optical Astronomy, Chinese Academy of Sciences (ULOAC), 100012 Beijing, China
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Qian SB,Yang YG,Qian, SB . Improved astrophysical parameters for the overcontact binary FG Hydrae[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2005,356(2):765-772.
APA Qian SB,Yang YG,&Qian, SB .(2005).Improved astrophysical parameters for the overcontact binary FG Hydrae.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,356(2),765-772.
MLA Qian SB,et al."Improved astrophysical parameters for the overcontact binary FG Hydrae".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 356.2(2005):765-772.
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