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UPDATED PHOTOMETRY AND ORBITAL PERIOD ANALYSIS FOR THE POLAR AM HERCULIS ON THE UPPER EDGE OF THE PERIOD GAP
Dai ZB(戴智斌)1,2; Qian SB(钱声帮)1,2; Li LJ(李临甲)1,2,3
Source PublicationASTROPHYSICAL JOURNAL
2013-09-10
Volume774Issue:2Pages:153-166
DOI10.1088/0004-637X/774/2/153
Contribution Rank第1完成单位
Indexed BySCI
Keywordbinaries: eclipsing novae, cataclysmic variables stars: individual (AM Herculis)
Abstract

Twenty-one new optical light curves, including five curves obtained in 2009 and sixteen curves detected from the AAVSO International Database spanning from 1977 to 2011, demonstrate 16 new primary minimum light times in the high state. Furthermore, seven newly found low-state transient events from 2006 to 2009 were discovered, consisting of five Gaussian-shaped events and two events with an exponential form with decay timescales of <0.005 days; these timescales are one order of magnitude shorter than those of previous X-ray flare events. In the state transition, two special events were detected: a "disrupted event" with an amplitude of similar to 2 mag and a duration of similar to 72 minutes and continuing R-band twin events larger than all known R-band flares detected in M-type red dwarfs. All 45 available high-state data points spanning over 35 yr were used to construct an updated O - C diagram of AM Herculis, which clearly shows a significant sine-like variation with a period of 12-15 yr and an amplitude of 6-9 minutes. Using the inspected physical parameters of the donor star, the secular variation in the O - C diagram cannot be interpreted by any decided angular momentum loss mechanism, but can satisfy the condition tau((M) over dot2) similar or equal to tau(KH) >> tau((R) over dot2), which is required by numerical calculations of the secular evolution of cataclysmic variables. In order to explain the prominent periodic modulation, three plausible mechanisms-spot motion, the light travel-time effect, and magnetic active cycles-are discussed in detail.

Funding ProjectWest Light Foundation of The Chinese Academy of Sciences ; Chinese Natural Science Foundation[11003040] ; Chinese Natural Science Foundation[111330007]
Funding OrganizationWest Light Foundation of The Chinese Academy of Sciences ; Chinese Natural Science Foundation[11003040, 111330007]
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
ISSN0004-637X
URL查看原文
Archive Date2013-10-09
WOS IDWOS:000323888900062
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordMAGNETIC CATACLYSMIC VARIABLES ; RESOLVED INFRARED-SPECTROSCOPY ; BINARY STELLAR EVOLUTION ; SIMULTANEOUS X-RAY ; LOW-STATE ; MASS-TRANSFER ; LIGHT-CURVE ; VV-PUPPIS ; ULTRAVIOLET OBSERVATIONS ; CHROMOSPHERIC ACTIVITY
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/5877
Collection双星与变星研究组
中国科学院天体结构与演化重点实验室
Corresponding AuthorDai ZB(戴智斌)
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences (CAS), P. O. Box 110, 650011 Kunming, China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Yunnan Observatories, Chinese Academy of Sciences (CAS), China
3.University of Chinese Academy of Sciences, Beijing, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Dai ZB,Qian SB,Li LJ. UPDATED PHOTOMETRY AND ORBITAL PERIOD ANALYSIS FOR THE POLAR AM HERCULIS ON THE UPPER EDGE OF THE PERIOD GAP[J]. ASTROPHYSICAL JOURNAL,2013,774(2):153-166.
APA Dai ZB,Qian SB,&Li LJ.(2013).UPDATED PHOTOMETRY AND ORBITAL PERIOD ANALYSIS FOR THE POLAR AM HERCULIS ON THE UPPER EDGE OF THE PERIOD GAP.ASTROPHYSICAL JOURNAL,774(2),153-166.
MLA Dai ZB,et al."UPDATED PHOTOMETRY AND ORBITAL PERIOD ANALYSIS FOR THE POLAR AM HERCULIS ON THE UPPER EDGE OF THE PERIOD GAP".ASTROPHYSICAL JOURNAL 774.2(2013):153-166.
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