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Period Analysis of Seven Field ab-type RR Lyrae Stars Based on O - C Diagrams: Cyclic Variations and Long-term Period Changes
Li LJ(李临甲)1,2,3; Qian SB(钱声帮)1,2,3,4; Zhu LY(朱俐颖)1,2,3,4
Source PublicationASTROPHYSICAL JOURNAL
2018-08-20
Volume863Issue:2Pages:13
DOI10.3847/1538-4357/aad32f
Contribution Rank第1完成单位
Indexed BySCI
KeywordMethods: Data Analysis Stars: Variables: Rr Lyrae Techniques: Photometric
Abstract

Using the times of light maximum collected from the GEOS RR Lyrae database and determined from sky surveys, we utilize the O - C method to study the period variations of seven field ab-type RR Lyrae stars. The time coverage of data for most stars is more than 100 years, allowing us to investigate period changes over a large time span. We find that the O - C diagrams for most stars can be described by a combination of cyclic variations and long-term period changes. Assuming the former were caused by the light-travel-time effect, the pulsation and orbital parameters are obtained by the nonlinear fitting. We find that the orbital periods in our sample range from 33 to 78 years, and the eccentricities are relatively higher than the results for other candidates (e > 0.6). The minimal masses of the potential companions of XX And, BK Dra, and RY Psc are less than one solar mass, and those of SV Eri, AR Her, and RU Scl are 3.3, 2.1, and 3.4 M-circle dot, respectively. Moreover, we suggest that the companion of AR Her may be a blue straggler that experienced mass transfer or a merger of two stars. The O -C diagram for ST Vir also shows distinct long-term period decrease, and in the O -C residuals, additional quasi-periodic variations that can be described by damped oscillation are found. Combining the data from the literature and our analysis, we plot the log P-A(O-C) diagram. The distribution of our binary candidates suggests that their period variations are not caused by the Blazhko effect.

Funding ProjectNSF[AST-0407380] ; NSF[AST-0909073] ; NSF[AST-1313370] ; West Light Foundation of Chinese Academy of Sciences ; National Natural Science Foundation of China[11325315] ; National Natural Science Foundation of China[11573063] ; National Natural Science Foundation of China[11611530685] ; Key Science Foundation of Yunnan Province[2017FA001]
Funding OrganizationNSF[AST-0407380, AST-0909073, AST-1313370] ; West Light Foundation of Chinese Academy of Sciences ; National Natural Science Foundation of China[11325315, 11573063, 11611530685] ; Key Science Foundation of Yunnan Province[2017FA001]
Language英语
Subject Area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
WOS IDWOS:000442222700013
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordHorizontal-branch Stars ; Blue Stragglers ; Stellar Evolution ; Magellanic System ; Variable-stars ; Ar-herculis ; Photometry ; Telescope ; Tarot ; Metallicities
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/17833
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 AuthorLi LJ(李临甲)
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, Kunming, 650216, People's Republic of China
2.Key laboratory of the structure and evolution of celestial objects, Chinese Academy of Sciences, P.O. Box 110, Kunming, 650216, People's Republic of China
3.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing, 100012, People's Republic of China
4.University of Chinese Academy of Sciences, 100049 Beijing, China/Yuquan Road 19#, Sijingshang Block, Beijing, 100049, People's Republic of China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Li LJ,Qian SB,Zhu LY. Period Analysis of Seven Field ab-type RR Lyrae Stars Based on O - C Diagrams: Cyclic Variations and Long-term Period Changes[J]. ASTROPHYSICAL JOURNAL,2018,863(2):13.
APA Li LJ,Qian SB,&Zhu LY.(2018).Period Analysis of Seven Field ab-type RR Lyrae Stars Based on O - C Diagrams: Cyclic Variations and Long-term Period Changes.ASTROPHYSICAL JOURNAL,863(2),13.
MLA Li LJ,et al."Period Analysis of Seven Field ab-type RR Lyrae Stars Based on O - C Diagrams: Cyclic Variations and Long-term Period Changes".ASTROPHYSICAL JOURNAL 863.2(2018):13.
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