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题名: AE Ursae Majoris - a delta Scuti star in the Hertzsprung Gap
作者: Niu, JS ;  Fu, JN ;  Li, Y ;  Yang, XH ;  Zong, WK ;  Xue, HF ;  Zhang, YP ;  Liu, N ;  Du, B ;  Zuo, F
刊名: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期: 2017
卷号: 467, 期号:3, 页码:3122-3139
关键词: techniques: photometric ;  techniques: spectroscopic ;  stars: individual: AE UMa ;  stars: oscillations ;  stars: variables: delta Scuti
学科分类: Astronomy & Astrophysics
DOI: http://dx.doi.org/10.1093/mnras/stx125
通讯作者: Fu, JN (reprint author), Beijing Normal Univ, Astron Dept, Beijing 100875, Peoples R China.
文章类型: Article
英文摘要: We analyse the photometric data and spectroscopic data collected on the d Scuti star AE Ursae Majoris ( AE UMa). The fundamental and the first overtone frequencies are confirmed as f(0) = 11.625 60 c d(-1) and f(1) = 15.031 24 c d(-1), respectively, from the frequency content by analysing light curves over 40 nights, spanning from 2009 to 2012. Additionally, another 37 frequencies are identified as either the harmonics or the linear combinations of the fundamental and the first overtone frequencies, among which 25 are newly detected. The rate of period change of the fundamental mode is determined as (1/P-0)(dP(0)/dt) = 5.4(+/- 1.9) x 10(-9) yr(-1) as revealed from the O - C diagram based on the 84 newly determined times of maximum light combined with those derived from the literature. The spectroscopic data suggest that AEUMa is a Population I d Scuti star. With these physical properties, we perform theoretical explorations based on the stellar evolution codeMESA on this target, considering that the variation of pulsation period is caused by secular evolutionary effects. We finally constrain AE UMa with physical parameters as follows: mass of 1.805 +/- 0.055M(circle dot), radius of 1.647 +/- 0.032 x 10(11) cm, luminosity of 1.381 +/- 0.048(log L/L-circle dot) and age of 1.055 +/- 0.095 x 10(9) yr. AE UMa can be the (Population I) d Scuti star that locates just after the second turn-off of its evolutional track leaving the main sequence, a star in the phase of the Hertzsprung Gap with a helium core and a hydrogen-burning shell.
类目[WOS]: Astronomy & Astrophysics
关键词[WOS]: SERIES ENSEMBLE PHOTOMETRY ;  STELLAR ASTROPHYSICS MESA ;  SX PHOENICIS STARS ;  EQUATION-OF-STATE ;  PERIOD CHANGES ;  BL CAMELOPARDALIS ;  MASS STARS ;  PULSATION ;  OPACITIES ;  ASTEROSEISMOLOGY
项目资助者: Joint Fund of Astronomy of National Natural Science Foundation of China (NSFC) ;  Chinese Academy of Sciences [U1231202] ;  NSFC [11673003] ;  National Basic Research Program of China (973 Program) [2014CB845700, 2013CB834900] ;  Chinese Academy of Sciences
语种: 英语
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/22050
Appears in Collections:理论物理所2017年知识产出_期刊论文

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Recommended Citation:
Niu, JS,Fu, JN,Li, Y,et al. AE Ursae Majoris - a delta Scuti star in the Hertzsprung Gap[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,467(3):3122-3139.
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