Observations and Orbital Analysis of the High-Amplitude Delta Scuti Star SZ Lyncis: The Unusual Orbital Precession

	Observations and Orbital Analysis of the High-Amplitude Delta Scuti Star SZ Lyncis: The Unusual Orbital Precession
	Li LJ(李临甲)1,2,3 ; Qian SB(钱声帮)1,2,3
刊名	PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
	2013-12-25
卷号	65 期号:6
关键词	stars: variables: delta Scuti stars: individual: SZ Lyncis techniques: photometric
ISSN号	0004-6264
通讯作者	Li, LJ (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China.
产权排序	第一完成单位
英文摘要	We determined forty-two new times of light maximum from our photometry observations and WASP project, and collected all times of light maximum observed between 1961 and 2013 in order to calculate the orbital elements of the SZ Lyncis system and the secular change of the pulsation period with the classical O - C method. We confirmed the decrease of the longitude of the periastron passage with a rate of (-1 degrees.15 +/- 0 degrees.25) yr(-1), and discussed the causative mechanism. The results show that the precession of the star's orbit might be due to a close binary system, which means that the companion of SZ Lyncis is actually a binary system. We used the Hipparcos Intermediate Astrometric Data to obtain the complete orbital elements of the SZ Lyncis system, and found that the inclination, i, and parallax, pi(t), are 39 degrees.5 +/- 17 degrees.7 and 2.61 +/- 0.98 mas (corresponds to 380 +/- 140 pc), respectively. We reanalyzed the mean radial velocities of SZ Lyncis given by Bardin and Imbert (1984), and noticed a weak variation existing in the residuals from a single-Keplerian fit. We suggest that more detailed high-precision spectroscopic observations are definitely needed in the future to check this short periodic change.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	INTERMEDIATE ASTROMETRIC DATA ; APSIDAL MOTION TEST ; SPECTROSCOPIC BINARIES ; PHOTOMETRIC PROPERTIES ; STELLAR STRUCTURE ; NU-OCTANTIS ; PERIOD ; CATALOG ; SYSTEMS ; ORI
收录类别	SCI
原文出处	http://pasj.oxfordjournals.org/content/65/6/116
语种	英语
WOS记录号	WOS:000336823800005
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/5872]
专题	云南天文台_双星与变星研究组云南天文台_中国科学院天体结构与演化重点实验室
作者单位	1.National Astronomical Observatories / Yunnan Observatory, Chinese Academy of Sciences,P.O. Box 110, 650011 Kunming, P. R. China 2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences,P.O. Box 110, 650011 Kunming, P. R. China 3.Graduate University of Chinese Academy of Sciences, 100049, Beijing, P. R. China Yuquan Road 19#, SijingShan Block, 100049, Beijing City, P. R. China
推荐引用方式 GB/T 7714	Li LJ,Qian SB. Observations and Orbital Analysis of the High-Amplitude Delta Scuti Star SZ Lyncis: The Unusual Orbital Precession[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,2013,65(6).
APA	Li LJ,&Qian SB.(2013).Observations and Orbital Analysis of the High-Amplitude Delta Scuti Star SZ Lyncis: The Unusual Orbital Precession.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,65(6).
MLA	Li LJ,et al."Observations and Orbital Analysis of the High-Amplitude Delta Scuti Star SZ Lyncis: The Unusual Orbital Precession".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 65.6(2013).