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CHROMOSPHERIC ACTIVITY AND ROTATIONAL MODULATION ON THE YOUNG, SINGLE K2 DWARF LQ Hya
Cao DT(曹东涛)1,2; Gu SH(顾盛宏)1,2
Source PublicationASTRONOMICAL JOURNAL
2014-02
Volume147Issue:2
DOI10.1088/0004-6256/147/2/38
Contribution Rank第1完成单位
Indexed BySCI
KeywordStars: Activity Stars: Chromospheres Stars: Individual (Lq Hya) Stars: Rotation
Abstract

High-resolution echelle spectra of LQ Hya, obtained during several observing runs from 2006 to 2012, have been analyzed to study its chromospheric activity. Using the spectral subtraction technique, we derived information about chromospheric activity of LQ Hya from several optical chromospheric activity indicators (including the H-beta, He I D-3, Na I D-1, D-2, H alpha, and Ca II infrared triplet (IRT) lines). No optical flares were found during our observations. The equivalent widths (EWs) of the excess emissions in the chromospheric activity lines have been measured. The ratios of EW8542/EW8498 are generally small, which indicates that the Ca II IRT emission arises from plage-like regions, while the EH alpha/EH beta values suggest that the emission of the Balmer lines is due to both plage and prominence structures for the observations in 2012. We find that clear rotational modulation of chromospheric emission exists, which suggests the presence and change of chromospheric active regions over the surface of LQ Hya. Moreover, the active regions were associated with the photospheric spots in spatial structure.

Funding ProjectNSFC[10373023] ; NSFC[10773027] ; NSFC[11333006] ; Chinese Academy of Sciences[KJCX2-YW-T24]
Funding OrganizationNSFC[10373023, 10773027, 11333006] ; Chinese Academy of Sciences[KJCX2-YW-T24]
Language英语
Subject Area天文学 ; 恒星与银河系
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-6256
URL查看原文
Archive Date2014-01-16
WOS IDWOS:000329837100014
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordMULTIWAVELENGTH OPTICAL OBSERVATIONS ; STELLAR SURFACE-STRUCTURE ; RS-CANUM-VENATICORUM ; H-ALPHA EMISSION ; BINARY-SYSTEMS ; PHYSICAL-PROPERTIES ; CLOSE BINARIES ; LINE-PROFILES ; AB-DORADUS ; HYDRAE
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/6803
Collection系外行星研究组
中国科学院天体结构与演化重点实验室
Corresponding AuthorCao DT(曹东涛)
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Cao DT,Gu SH. CHROMOSPHERIC ACTIVITY AND ROTATIONAL MODULATION ON THE YOUNG, SINGLE K2 DWARF LQ Hya[J]. ASTRONOMICAL JOURNAL,2014,147(2).
APA Cao DT,&Gu SH.(2014).CHROMOSPHERIC ACTIVITY AND ROTATIONAL MODULATION ON THE YOUNG, SINGLE K2 DWARF LQ Hya.ASTRONOMICAL JOURNAL,147(2).
MLA Cao DT,et al."CHROMOSPHERIC ACTIVITY AND ROTATIONAL MODULATION ON THE YOUNG, SINGLE K2 DWARF LQ Hya".ASTRONOMICAL JOURNAL 147.2(2014).
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