PHOTOMETRY OF VARIABLE STARS FROM THE THU-NAOC TRANSIENT SURVEY. I. THE FIRST TWO YEARS

CORC > 紫金山天文台 > 中国科学院紫金山天文台 > 宇宙伽马暴、中子星及相关物理研究团组

	PHOTOMETRY OF VARIABLE STARS FROM THE THU-NAOC TRANSIENT SURVEY. I. THE FIRST TWO YEARS
	Yao, Xinyu 1,2,3,4; Wang, Lingzhi 3,4,5,6; Wang, Xiaofeng 3,4; Zhang, Tianmeng 5; Chen, Juncheng 3,4; Yuan, Wenlong 3,4,7; Mo, Jun 3,4; Li, Wenxiong 3,4; Jin, Zhiping2 ; Wu, Xuefeng2
刊名	ASTRONOMICAL JOURNAL
	2015-10-01
卷号	150 期号:4
关键词	binaries: eclipsing stars: evolution stars: variables: general stars: variables: RR Lyrae
英文摘要	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.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
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
WOS记录号	WOS:000365863900010
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/16075]
专题	紫金山天文台_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
推荐引用方式 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).