PHOTOMETRY OF VARIABLE STARS FROM THE THU-NAOC TRANSIENT SURVEY. I. THE FIRST TWO YEARS
Yao, Xinyu1,2,3,4; Wang, Lingzhi3,4,5,6; Wang, Xiaofeng3,4; Zhang, Tianmeng5; Chen, Juncheng3,4; Yuan, Wenlong3,4,7; Mo, Jun3,4; Li, Wenxiong3,4; Jin, Zhiping2; Wu, Xuefeng2; Nie, JunDan5; Zhou, Xu5
2015-10-01
发表期刊ASTRONOMICAL JOURNAL
卷号150期号:4
摘要In this paper, we report the detections of stellar variabilities from the first two years of observations of a sky area of about 1300 square degrees from the Tsinghua University-NAOC Transient Survey. A total of 1237 variable stars (including 299 new ones) were detected with a brightness <18.0 mag and a magnitude variation greater than or similar to 0.1 mag on a timescale from a few hours to a few hundred days. Among such detections, we tentatively identified 661 RR Lyrae stars, 431 binaries, 72 semi-regular pulsators, 29 Mira stars, 11 slow irregular variables, 11 RS Canum Venaticorum stars, 7 Gamma Doradus stars, 5 long-period variables, 3 W Virginis stars, 3 Delta Scuti stars, 2 Anomalous Cepheids, 1 Cepheid, and 1 nova-like star based on their time-series variability index Js and their phased diagrams. Moreover, we found that 14 RR Lyrae stars show the Blazhko effect and 67 contact eclipsing binaries exhibit the O'Connell effect. Since the period and amplitude of light variations of RR Lyrae variables depend on their chemical compositions, their photometric observations can be used to investigate the distribution of metallicity along the direction perpendicular to the Galactic disk. We find that the metallicity of RR Lyrae stars shows large scatter at regions closer to the Galactic plane (e.g., -3.0 < [Fe/H] < 0) but tends to converge at [Fe/H] similar to -1.7 at larger Galactic latitudes. This variation may be related to the fact that the RRAB Lyrae stars in the Galactic halo come from globular clusters with different metallicities and vertical distances, i.e., OoI and OoII populations, favoring the dual-halo model.
文章类型Article
关键词Binaries: Eclipsing Stars: Evolution Stars: Variables: General Stars: Variables: Rr Lyrae
WOS标题词Science & Technology ; Physical Sciences
DOI10.1088/0004-6256/150/4/107
关键词[WOS]RR-LYRAE STARS ; LARGE-MAGELLANIC-CLOUD ; GALACTIC HALO ; ECLIPSING BINARIES ; FREQUENCY-ANALYSIS ; GLOBULAR-CLUSTERS ; SPECTRAL-ANALYSIS ; CATALINA SURVEYS ; LIGHT CURVES ; SPACED DATA
收录类别SCI
语种英语
项目资助者National Basic Research Program (973 Program) of China(2013CB834903 ; National Natural Science Foundation of China (NSFC)(11178003 ; Strategic Priority Research Program "The Emergence of Cosmological Structures" of the Chinese Academy of Sciences(XDB09000000) ; Foundation of Tsinghua University(2011Z02170) ; One-hundred-talents program of the Chinese Academy of Sciences(034031001) ; One-hundred-talents Program ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Natural Science Foundation of Jiangsu Province ; 2012CB821800 ; 11303041 ; 2013CB834901) ; 11322328 ; 11325313)
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000365863900010
引用统计
被引频次:4[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://libir.pmo.ac.cn/handle/332002/16075
专题宇宙伽马暴、中子星及相关物理研究团组
作者单位1.Qinghai Normal Univ, Xining 810008, Peoples R China
2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
3.Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China
4.Tsinghua Univ, Tsinghua Ctr Astrophys THCA, Beijing 100084, Peoples R China
5.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China
6.Chinese Acad Sci South Amer Ctr Astron, Santiago, Chile
7.Texas A&M Univ, Dept Phys & Astron, George P & Cynthia Woods Mitchell Inst Fundamenta, College Stn, TX 77843 USA
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Yao, Xinyu,Wang, Lingzhi,Wang, Xiaofeng,et al. PHOTOMETRY OF VARIABLE STARS FROM THE THU-NAOC TRANSIENT SURVEY. I. THE FIRST TWO YEARS[J]. ASTRONOMICAL JOURNAL,2015,150(4).
APA Yao, Xinyu.,Wang, Lingzhi.,Wang, Xiaofeng.,Zhang, Tianmeng.,Chen, Juncheng.,...&Zhou, Xu.(2015).PHOTOMETRY OF VARIABLE STARS FROM THE THU-NAOC TRANSIENT SURVEY. I. THE FIRST TWO YEARS.ASTRONOMICAL JOURNAL,150(4).
MLA Yao, Xinyu,et al."PHOTOMETRY OF VARIABLE STARS FROM THE THU-NAOC TRANSIENT SURVEY. I. THE FIRST TWO YEARS".ASTRONOMICAL JOURNAL 150.4(2015).
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