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Plausible explanations for the variations of orbital period in the old nova DQ Herculis
Dai ZB(戴智斌)1,2,3; Qian SB(钱声帮)1,2; Dai, ZB (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China.
Source PublicationASTRONOMY & ASTROPHYSICS
2009-09
Volume503Issue:3Pages:883-U265
DOI10.1051/0004-6361/200810909
Contribution Rank第1完成单位
Indexed BySCI ; EI
KeywordStars: Novae Cataclysmic Variables Stars: Binaries: Eclipsing Stars: Individual: Dq Herculis
AbstractAims. Several mechanisms are presented to explain the observed small variation in the orbital period of the old nova DQ Herculis. Methods. We have combined two new CCD times of light minimum of DQ Herculis with all 226 available times of light minimum, including 79 visual observations, for the new orbital period analysis. Results. Based on this analysis, the best-fit of the O-C diagram for DQ Herculis is a quadratic-plus- sinusoidal fit. A secular orbital period increase with a rate of 9.5(+/- 0.1) x 10(-12) s s(-1) is confirmed, which corresponds to a lower limit of the mass transfer rate of 7.2(+/- 3.2) x 10(-9) M(circle dot) yr(-1). We investigate three plausible mechanisms (direct change of the red dwarf's radius, Applegate's mechanism and the light travel-time effect) to explain the quasi-periodic variation shown in the O-C diagram. Although previous works have suggested that solar-type magnetic cycles in the red dwarf can explain the quasi-periodic variation in the orbital period, we were not able to reproduce this finding. Accordingly, a light trave-time effect is proposed, with a brown dwarf as a tertiary component with a significance level of greater than or similar to 77.8% orbiting around nova DQ Herculis. In order to interpret the small departure from the best-fit near 60 000 cycles, we assume an eccentric orbit of the third body with a small eccentricity. However, a satisfying result was obtained because the eccentricity e = 0.12 is close to zero. The parameters of this elliptical orbit are similar to that of a circular orbit.
Funding OrganizationSpecial Foundation of the President of the Chinese Academy of Sciences ; West Light Foundation of The Chinese Academy of Sciences ; Yunnan Natural Science Foundation [2008CD157, 2005A0059M] ; Chinese Natural Science Foundation [10573032, 10573013, 10433030]
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeArticle
ISSN0004-6361
URL查看原文
Archive Date2009-09-22
WOS IDWOS:000269727100025
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordRAPID BLUE VARIABLES ; 71 2ND OSCILLATION ; CATACLYSMIC VARIABLES ; U-GEMINORUM ; BINARIES ; ECLIPSE ; PHOTOMETRY ; PROFILE ; SYSTEM ; STARS
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Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/5819
Collection双星与变星研究组
Corresponding AuthorDai, ZB (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China.
Affiliation1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, PO Box 110, 650011 Kunming, PR China
2.United Laboratory of Optical Astronomy, Chinese Academy of Science (ULOAC), 100012 Beijing, PR China
3.Graduate School of the CAS, Beijing, PR China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Dai ZB,Qian SB,Dai, ZB . Plausible explanations for the variations of orbital period in the old nova DQ Herculis[J]. ASTRONOMY & ASTROPHYSICS,2009,503(3):883-U265.
APA Dai ZB,Qian SB,&Dai, ZB .(2009).Plausible explanations for the variations of orbital period in the old nova DQ Herculis.ASTRONOMY & ASTROPHYSICS,503(3),883-U265.
MLA Dai ZB,et al."Plausible explanations for the variations of orbital period in the old nova DQ Herculis".ASTRONOMY & ASTROPHYSICS 503.3(2009):883-U265.
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