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LAMOST views delta Scuti pulsating stars
Qian SB(钱声帮)1,2,3,4; Li LJ(李临甲)1,2,3; He JJ(何家佳)1,2,3; Zhang J(张嘉)1,2,3; Zhu LY(朱俐颖)1,2,3,4; Han ZT(韩忠涛)1,2,3
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2018-03-01
Volume475Issue:1Pages:478-491
DOI10.1093/mnras/stx3185
Contribution Rank第1完成单位
Indexed BySCI
KeywordBinaries: General Stars: Fundamental Parameters Stars: Oscillations Stars: Variables: Scuti
Abstract

About 766 delta Scuti stars were observed by LAMOST by 2017 June 16. Stellar atmospheric parameters of 525 variables were determined, while spectral types were obtained for all samples. In the paper, those spectroscopic data are catalogued. We detect a group of unusual and cool variable stars (UCVs) that are distinguished from the normal delta Scuti stars (NDSTs). On the H-R diagram and the log g-T diagram, the UCVs are far beyond the red edge of pulsational instability trip. Their effective temperatures are lower than 6700 K with periods in the range from 0.09 to 0.22 d. NDSTs have metallicity close to that of the Sun as expected, while UCVs are slightly metal poor than NDSTs. The two peaks on the distributions of the period and stellar atmospheric parameters are all caused by the existence of UCVs. When those UCVs are excluded, it is discovered that the effective temperature, the gravitational acceleration, and the metallicity all are correlated with the pulsating period for NDSTs and their physical properties and evolutionary states are discussed. Detection of those UCVs indicates that about 25 per cent of the known delta Scuti stars may be misclassified. However, if some of them are confirmed to be pulsating stars, they will be a new-type pulsator and their investigations will shed light on theoretical instability domains and on the theories of interacting between the pulsation and the convection of solar-type stars. Meanwhile, 88 delta Scuti stars are detected to be the candidates of binary or multiple systems.

Funding ProjectNational Natural Science Foundation of China[11325315] ; National Development and Reform Commission
Funding OrganizationNational Natural Science Foundation of China[11325315] ; National Development and Reform Commission
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
PublisherOXFORD UNIV PRESS
Publication PlaceGREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
ISSN0035-8711
URL查看原文
WOS IDWOS:000427144200038
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordSKY AUTOMATED SURVEY ; RR LYRAE STARS ; VARIABLE-STARS ; TELESCOPE LAMOST ; ECLIPSING BINARY ; RADIAL-VELOCITY ; SX PHOENICIS ; DATA RELEASE ; CATALOG ; OSCILLATIONS
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/12303
Collection双星与变星研究组
中国科学院天体结构与演化重点实验室
Corresponding AuthorQian SB(钱声帮); Li LJ(李临甲); Zhu LY(朱俐颖)
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences (CAS), PO Box 110, 650216 Kunming, China
2.Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, PO Box 110, 650216 Kunming, China
3.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang Dis- trict, 100012 Beijing, P. R. China
4.University of Chinese Academy of Sciences, Yuquan Road 19#, Sijingshang Block, 100049 Beijing, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Qian SB,Li LJ,He JJ,et al. LAMOST views delta Scuti pulsating stars[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,475(1):478-491.
APA Qian SB,Li LJ,He JJ,Zhang J,Zhu LY,&Han ZT.(2018).LAMOST views delta Scuti pulsating stars.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,475(1),478-491.
MLA Qian SB,et al."LAMOST views delta Scuti pulsating stars".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 475.1(2018):478-491.
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