Asteroseismology of the Double-mode High-amplitude delta Scuti Star VX Hydrae

doi:10.3847/1538-4357/aac9c5

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	Asteroseismology of the Double-mode High-amplitude delta Scuti Star VX Hydrae
	Yan, HL ; Xue, HF ; Fu, JN ; Fox-Machado, L ; Shi, JR ; Zhou, YT ; Zhang, JB ; Michel, R ; Niu, JS ; Zong, WK
刊名	ASTROPHYSICAL JOURNAL
	2018
卷号	861 期号:2 页码:96
关键词	EQUATION-OF-STATE STELLAR EVOLUTION PERIOD CHANGES PULSATION OPACITIES
ISSN号	0004-637X
DOI	10.3847/1538-4357/aac9c5
英文摘要	Bi-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.
学科主题	Astronomy & Astrophysics
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/22867]
专题	理论物理研究所_理论物理所1978-2010年知识产出
作者单位	1.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 2.Castro, A.] Univ Southampton, Phys & Astron, Southampton SO17 1BJ, Hants, England 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Shanxi Univ, Inst Theoret Phys, Taiyuan 030006, Peoples R China 5.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China 6.Chinese Acad Sci, Inst Theoret Phys, Key Lab Theoret Phys, Beijing 100190, Peoples R China 7.Chinese Acad Sci, Yunnan Observ, Kunming 650216, Yunnan, Peoples R China 8.Univ Chinese Acad Sci, Sch Phys Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China 9.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China
推荐引用方式 GB/T 7714	Yan, HL,Xue, HF,Fu, JN,et al. Asteroseismology of the Double-mode High-amplitude delta Scuti Star VX Hydrae[J]. ASTROPHYSICAL JOURNAL,2018,861(2):96.
APA	Yan, HL.,Xue, HF.,Fu, JN.,Fox-Machado, L.,Shi, JR.,...&Altamirano-Devora, L.(2018).Asteroseismology of the Double-mode High-amplitude delta Scuti Star VX Hydrae.ASTROPHYSICAL JOURNAL,861(2),96.
MLA	Yan, HL,et al."Asteroseismology of the Double-mode High-amplitude delta Scuti Star VX Hydrae".ASTROPHYSICAL JOURNAL 861.2(2018):96.