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Xue, HF; Fu, JN; Fox-Machado, L; Shi, JR; Zhou, YT; Zhang, JB; Michel, R; Yan, HL; Niu, JS; Zong, WK; Su, J7; Castro, A; Ayala-Loera, C; Altamirano-Devora, L
Asteroseismology of the Double-mode High-amplitude delta Scuti Star VX Hydrae
AbstractBi-site time-series photometric and high-resolution spectroscopic observations were made for the double-mode high-amplitude delta Scuti star VX Hya. The fundamental frequency f(0) = 4.4763 c days(-1), the first overtone f(1) = 5.7897 c days(-1), and 23 harmonics and linear combinations of f(0) and f(1) are detected by pulsation analysis. From the spectroscopic data, we get [Fe/H] = -0.2 +/- 0.1 dex. The period change rate of the fundamental mode is obtained by using the Fourier-phase diagram method, which gives the value of (1/P-0)(dP(0)/dt) = (1.81 +/- 0.09) x 10(-7) yr(-1). With these results from the observations, we perform theoretical explorations with the stellar evolution code MESA, and constrain the models by fitting f(0), f(1), and (1/P-0)(dP(0)/dt) within 3 sigma deviations. The results show that the period change of VX Hya could be ascribed to the evolutionary effect. The stellar parameters of VX Hya could be derived as: the mass 2.385 +/- 0.025M(circle dot), the luminosity log(L/L-circle dot) = 1.93 +/- 0.02, and the age (4.43 +/- 0.13) x 10(8) years. VX Hya is found to locate at the post-main-sequence stage with a helium core and a hydrogen-burning shell on the H-R diagram.
Subject AreaAstronomy & Astrophysics
MOST Discipline CatalogueAstronomy & Astrophysics
Indexed BySCIE
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Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China
2.Fox-Machado, L.; Michel, R.; Castro, A.; Ayala-Loera, C.; Altamirano-Devora, L.] Univ Nacl Autonoma Mexico, Observ Astron Nacl, Inst Astron, Ap P 877, Ensenada 22860, Baja California, Mexico
3.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
5.Shanxi Univ, Inst Theoret Phys, Taiyuan 030006, Peoples R China
6.Chinese Acad Sci, Inst Theoret Phys, Key Lab Theoret Phys, Beijing 100190, Peoples R China
7.Univ Chinese Acad Sci, Sch Phys Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
8.Chinese Acad Sci, Yunnan Observ, Kunming 650216, Yunnan, Peoples R China
9.Castro, A.] Univ Southampton, Phys & Astron, Southampton SO17 1BJ, Hants, England
Recommended Citation
GB/T 7714
Xue, HF,Fu, JN,Fox-Machado, L,et al. Asteroseismology of the Double-mode High-amplitude delta Scuti Star VX Hydrae[J]. ASTROPHYSICAL JOURNAL,2018,861(2):96.
APA Xue, HF.,Fu, JN.,Fox-Machado, L.,Shi, JR.,Zhou, YT.,...&Altamirano-Devora, L.(2018).Asteroseismology of the Double-mode High-amplitude delta Scuti Star VX Hydrae.ASTROPHYSICAL JOURNAL,861(2),96.
MLA Xue, HF,et al."Asteroseismology of the Double-mode High-amplitude delta Scuti Star VX Hydrae".ASTROPHYSICAL JOURNAL 861.2(2018):96.
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