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| 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
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| 2015-10-01 | |
| Source Publication | ASTRONOMICAL JOURNAL
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| Volume | 150Issue:4 |
| Abstract | 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. |
| Keyword | Binaries: Eclipsing Stars: Evolution Stars: Variables: General Stars: Variables: Rr Lyrae |
| WOS Headings | Science & Technology ; Physical Sciences |
| DOI | 10.1088/0004-6256/150/4/107 |
| WOS Keyword | RR-LYRAE STARS ; LARGE-MAGELLANIC-CLOUD ; GALACTIC HALO ; ECLIPSING BINARIES ; FREQUENCY-ANALYSIS ; GLOBULAR-CLUSTERS ; SPECTRAL-ANALYSIS ; CATALINA SURVEYS ; LIGHT CURVES ; SPACED DATA |
| Indexed By | SCI |
| Language | 英语 |
| WOS Research Area | Astronomy & Astrophysics |
| WOS Subject | Astronomy & Astrophysics |
| WOS ID | WOS:000365863900010 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://libir.pmo.ac.cn/handle/332002/16075 |
| Collection | 宇宙伽马暴、中子星及相关物理研究团组 |
| Affiliation | 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 |
| Recommended Citation GB/T 7714 | 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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