Photometric study of the short-period RS Canum Venaticorum binary RT Andromedae

	Photometric study of the short-period RS Canum Venaticorum binary RT Andromedae
	Zhang LY(张立云)1,2 ; Gu SH(顾盛宏)1
刊名	ASTRONOMY & ASTROPHYSICS
	2007-08
卷号	471 期号:1 页码:219-U16
关键词	stars : active binaries : eclipsing stars : individual : RT And starspots
ISSN号	0004-6361
通讯作者	Zhang, LY (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Joint Lab Opt Astron, Beijing 100864, Peoples R China.
产权排序	第一完成单位
英文摘要	Context. Long-term photometric observations of cool stars can reveal the evolution and activity cycles of the stellar active region. Furthermore, studying the stellar activity provides opportunities for understanding of stellar dynamo and valuable constraints for stellar dynamo theory. Aims. We analyze our observational data and discuss light-curve variability due to starspots on both a short and long time scale, especially the short-term variation. At the same time, we accumulate some results from the literature to discuss active-region evolution and activity cycles. Methods. By analyzing the light curves using the Wilson-Devinney program, the photometric solution of the system is obtained and the starspot parameters are also derived. Using the phase-dispersion minimization method, we infer the activity cycle of RT And. Results. The case of two spots being on the primary is most successful in reproducing the light curve distortion of RT And in 2004. Although the light curves in 1999 and 2005 do not have sufficient phase coverage, we still could use the spot model to explain their light-curve variation successfully based on the photometric solution in 2004. Comparing the light curves of 1999, 2004, and 2005, the light curve distortion changes on both short and long time scales, especially the significant variation around the secondary minimum on a time scale of two months. Analysis of the longitude of spots within the belt around 270 degrees suggests that the activity cycle of RT And may be 6.69 +/- 0.80 years.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Sheng-hong Gu
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	LIGHT CURVES ; ECLIPSING BINARIES ; STARSPOT ACTIVITY ; CYGNI
收录类别	SCI ; EI
原文出处	http://www.aanda.org/articles/aa/abs/2007/31/aa6767-06/aa6767-06.html
语种	英语
WOS记录号	WOS:000248394400028
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/5184]
专题	云南天文台_恒星物理研究组
作者单位	1.National Astronomical Observatories/Yunnan Observatory, Joint laboratory for optical astronomy, Chinese Academy of Sciences, Kunming, PR China 2.Graduate School of Chinese Academy of Sciences, Beijing 100039, PR China
推荐引用方式 GB/T 7714	Zhang LY,Gu SH. Photometric study of the short-period RS Canum Venaticorum binary RT Andromedae[J]. ASTRONOMY & ASTROPHYSICS,2007,471(1):219-U16.
APA	Zhang LY,&Gu SH.(2007).Photometric study of the short-period RS Canum Venaticorum binary RT Andromedae.ASTRONOMY & ASTROPHYSICS,471(1),219-U16.
MLA	Zhang LY,et al."Photometric study of the short-period RS Canum Venaticorum binary RT Andromedae".ASTRONOMY & ASTROPHYSICS 471.1(2007):219-U16.