Chromospheric activity on the RS CVn-type binary UX Arietis

	Chromospheric activity on the RS CVn-type binary UX Arietis
	Gu SH(顾盛宏); Tan HS(谭徽松); Dan HG(单红光); Zhang FH(张奉辉)
刊名	ASTRONOMY & ASTROPHYSICS
	2002-06
卷号	388 期号:3 页码:889-898
关键词	stars : activity stars : binaries : close stars : chromosphere stars : flare stars : individual : UX Ari
ISSN号	0004-6361
通讯作者	Gu, SH (reprint author), Chinese Acad Sci, Natl Astron Observ, Joint Lab Opt Astron, Yunnan Observ, Kunming, Peoples R China.
产权排序	第一完成单位
英文摘要	High resolution spectroscopic observations of UX Ari made during three observing seasons in 2000 have been analyzed by means of the spectral subtraction technique. The information about chromospheric activity of UX Ari has been obtained from several optical chromospheric activity indicators such as the Hei D-3, Nai D-1, D-2, H-alpha, and CaII IRT lines. The results suggest the chromospheric activity of the system is associated with the cooler secondary. An orbital phase modulation of chromospheric emissions is found, and consequently the activity longitude area of the system is obtained, that corresponds to the phase interval near the second quadrature of the binary system. A are-like event is detected during our new observations, characterized by the dramatic increase in the Halpha and CaII IRT emission lines, that is confirmed by the emission of the Hei D-3 line and the filled-in cores of the Nai D-1, D-2 lines. It is found that the values of the EW8542/EW8498 ratio decrease when the activity of the system increases, especially when the are occurs. The small values of the EW8542/EW8498 ratio indicate that the CaII IRT emissions come from plage-like regions. The high activity level of UX Ari around the quadrature may originate with the coupling between the chromospheric activity of the secondary and the mass transfer activity of the two components.
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]	MULTIWAVELENGTH OPTICAL OBSERVATIONS ; TIME-RESOLVED SPECTROSCOPY ; SHORT-PERIOD SYSTEMS ; H-ALPHA ; CANUM-VENATICORUM ; URSAE MAJORIS ; EMISSION ; HR-1099
收录类别	SCI
原文出处	http://www.aanda.org/articles/aa/abs/2002/24/aa2217/aa2217.html
语种	英语
WOS记录号	WOS:000176441300013
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/5158]
专题	云南天文台_恒星物理研究组
作者单位	Yunnan Observatory, Joint laboratory for optical astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Kunming, PR China
推荐引用方式 GB/T 7714	Gu SH,Tan HS,Dan HG,et al. Chromospheric activity on the RS CVn-type binary UX Arietis[J]. ASTRONOMY & ASTROPHYSICS,2002,388(3):889-898.
APA	Gu SH,Tan HS,Dan HG,&Zhang FH.(2002).Chromospheric activity on the RS CVn-type binary UX Arietis.ASTRONOMY & ASTROPHYSICS,388(3),889-898.
MLA	Gu SH,et al."Chromospheric activity on the RS CVn-type binary UX Arietis".ASTRONOMY & ASTROPHYSICS 388.3(2002):889-898.