Affiliation:
1. Department of Astronomy, Beijing Normal University, 19 Avenue Xinjiekouwai, Beijing 100875, People’s Republic of China
Abstract
ABSTRACT
EZ Cnc, or EPIC 212182292, is a non-Blažko RRab variable star located in the field of K2 Campaign 16. Its atmospheric parameters (Teff, log g, [M/H]) and radial velocities are measured from the 55 high-quality LAMOST medium-resolution spectra. The fundamental frequency of pulsation is derived as f = 1.8323(17) d−1 from the K2 light curves. The amplitude ratios R21 = 0.5115(15), 0.490(8), R31 = 0.3249(20), 0.279(7) and Fourier phase differences φ21 = 2.7550(20), 2.764(16), φ31 = 5.7194(25), 5.719(31) are determined from the Fourier decomposition of K2 light curve and LAMOST radial velocity curve, respectively. Through the constraints of the parameters, four optimal models are obtained in a time-dependent turbulent convection model survey for EPIC 212182292. The parameters of EPIC 212182292 are derived as M = 0.48 ± 0.03 M⊙, L = 42 ± 2 L⊙, Teff = 6846 ± 50 K, log g = 2.79 ± 0.01 dex, and Z = 0.006 ± 0.002, respectively. The precisely determined parameters for RRab variable stars like EPIC 212180092 might help to better understand the period–luminosity relationship of RR Lyrae stars.
Funder
National Natural Science Foundation of China
Fundamental Research Funds for the Central Universities
National Development and Reform Commission
Publisher
Oxford University Press (OUP)
Subject
Space and Planetary Science,Astronomy and Astrophysics
Cited by
6 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献