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Asteroseismology of the delta Scuti star HD 50844
Chen XH(陈兴浩)1,2,3; Li Y(李焱)1,2; Lai XJ(赖祥军)1,2; Wu T(吴涛)1,2
Source PublicationASTRONOMY & ASTROPHYSICS
2016-09-01
Volume593
DOI10.1051/0004-6361/201628197
Contribution Rank第1完成单位
Indexed BySCI ; EI
KeywordAsteroseismology Stars: Variables: Delta Scuti Stars: Individual: Hd 50844
Abstract

Aims. We aim to probe the internal structure and investigate with asteroseismology for more detailed information on the delta Scuti star HD 50844. 

Methods. We analyse the observed frequencies of the delta Scuti star HD 50844 and search for possible multiplets, which are based on the rotational splitting law of g-mode. We tried to disentangle the frequency spectra of HD 50844 only by means of rotational splitting. We then compare these with theoretical pulsation modes, which correspond to stellar evolutionary models with various sets of initial metallicity and stellar mass, to find the best-fitting model. 

Results. There are three multiplets, including two complete triplets and one incomplete quintuplet, in which mode identifications for spherical harmonic degree l and azimuthal number m are unique. The corresponding rotational period of HD 50844 is found to be 2.44(-0.08)(+0.13) days. The physical parameters of HD 50844 are well limited in a small region by three modes that have been identified as nonradial ones (f(11), f(22), and f(29)) and by the fundamental radial mode (f(4)). Our results show that the three nonradial modes (f(11), f(22), and f(29)) are all mixed modes, which mainly represent the property of the helium core. The fundamental radial mode (f(4)) mainly represents the property of the stellar envelope. To fit these four pulsation modes, both the helium core and the stellar envelope need to be matched to the actual structure of HD 50844. Finally, the mass of the helium core of HD 50844 is estimated to be 0.173 +/- 0.004 M-circle dot for the first time. The physical parameters of HD 50844 are determined to be M = 1.81 +/- 0.01 M-circle dot, Z = 0.008 +/- 0.001. T-eff = 7508 +/- 125 K, log g = 3.658 +/- 0.004, R = 3.300 +/- 0.023 R-circle dot, L = 30.98 +/- 2.39 L-circle dot.

Funding ProjectNSFC of China[11333006] ; NSFC of China[11521303] ; NSFC of China[11403094] ; foundation of Chinese Academy of Sciences[XDB09010202]
Funding OrganizationNSFC of China[11333006, 11521303, 11403094] ; foundation of Chinese Academy of Sciences[XDB09010202]
Language英语
Subject Area天文学 ; 恒星与银河系 ; 恒星物理学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherEDP SCIENCES S A
Publication Place17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE
ISSN0004-6361
URL查看原文
Archive Date2016-09-26
WOS IDWOS:000385820100048
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordSTELLAR ASTROPHYSICS MESA ; PULSATION MODES ; ALPHA OPHIUCHI ; VARIABLE-STARS ; FG-VIRGINIS ; OSCILLATIONS ; ROTATION ; FREQUENCIES ; OPACITIES ; MODULES
EI Accession Number20164002867377
EI KeywordsStars
EI Classification Number657.2Extraterrestrial Physics and Stellar Phenomena - 804Chemical Products Generally
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/9772
Collection恒星物理研究组
中国科学院天体结构与演化重点实验室
Corresponding AuthorChen XH(陈兴浩)
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, PO Box 110, 650011 Kunming, PR China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, PO Box 110, 650011 Kunming, PR China
3.University of Chinese Academy of Sciences, 100049 Beijing, PR China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Chen XH,Li Y,Lai XJ,et al. Asteroseismology of the delta Scuti star HD 50844[J]. ASTRONOMY & ASTROPHYSICS,2016,593.
APA Chen XH,Li Y,Lai XJ,&Wu T.(2016).Asteroseismology of the delta Scuti star HD 50844.ASTRONOMY & ASTROPHYSICS,593.
MLA Chen XH,et al."Asteroseismology of the delta Scuti star HD 50844".ASTRONOMY & ASTROPHYSICS 593(2016).
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