PULSATIONS AND PERIOD CHANGES OF THE NON-BLAZHKO RR LYRAE VARIABLE Y OCT OBSERVED FROM DOME A, ANTARCTICA

	PULSATIONS AND PERIOD CHANGES OF THE NON-BLAZHKO RR LYRAE VARIABLE Y OCT OBSERVED FROM DOME A, ANTARCTICA
	Wang, LF; Wang, LF; Feng, LL; Feng, LL; Zhu, ZX; Zhu, ZX; Zhou, X; Zhou, X
刊名	ASTRONOMICAL JOURNAL
	2015
卷号	149 期号:1 页码:25
英文摘要	During the operation of the Chinese Small Telescope Array (CSTAR) in Dome A of Antarctica in the years 2008, 2009, and 2010, large amounts of photometric data have been obtained for variable stars in the CSTAR field. We present here the study of one of six RR Lyrae variables, Y Oct, observed with CSTAR in Dome A, Antarctica. Photometric data in the i band were obtained in 2008 and 2010, with a duty cycle (defined as the fraction of time representing scientifically available data to CSTAR observation time) of about 44% and 52%, respectively. In 2009, photometric data in the g and r bands were gathered for this star, with a duty cycle of 65% and 60%, respectively. Fourier analysis of the data in the three bands only shows the fundamental frequency and its harmonics, which is characteristic of the non-Blazhko RR Lyrae variables. Values of the fundamental frequency and the amplitudes, as well as the total pulsation amplitude, are obtained from the data in the three bands separately. The amplitude of the fundamental frequency and the total pulsation amplitude in the g band are the largest, and those in the i band the smallest. Two-hundred fifty-one times of maximum are obtained from the three seasons of data, which are analyzed together with 38 maximum times provided in the GEOS RR Lyrae database. A period change rate of -0.96 +/- 0.07 days Myr(-1) is then obtained, which is a surprisingly large negative value. Based on relations available in the literature, the following physical parameters are derived: [Fe/H] = -1.41 +/- 0.14, MV = 0.696 +/- 0.014 mag, V - K = 1.182 +/- 0.028 mag, log T-eff = 3.802 +/- 0.003 K, log g = 2.705 +/- 0.004, logL/L-circle dot = 1.625 +/- 0.013, and logM/M-circle dot = -0.240 +/- 0.019.
学科主题	天文和天体物理
收录类别	SCI
语种	英语
WOS记录号	WOS:000347308300024
公开日期	2015-12-24
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/14899]
专题	紫金山天文台_南极天文中心
推荐引用方式 GB/T 7714	Wang, LF,Wang, LF,Feng, LL,et al. PULSATIONS AND PERIOD CHANGES OF THE NON-BLAZHKO RR LYRAE VARIABLE Y OCT OBSERVED FROM DOME A, ANTARCTICA[J]. ASTRONOMICAL JOURNAL,2015,149(1):25.
APA	Wang, LF.,Wang, LF.,Feng, LL.,Feng, LL.,Zhu, ZX.,...&Zhou, X.(2015).PULSATIONS AND PERIOD CHANGES OF THE NON-BLAZHKO RR LYRAE VARIABLE Y OCT OBSERVED FROM DOME A, ANTARCTICA.ASTRONOMICAL JOURNAL,149(1),25.
MLA	Wang, LF,et al."PULSATIONS AND PERIOD CHANGES OF THE NON-BLAZHKO RR LYRAE VARIABLE Y OCT OBSERVED FROM DOME A, ANTARCTICA".ASTRONOMICAL JOURNAL 149.1(2015):25.