恒星物理研究组知识库

According to the rotational splitting law of g modes, the frequency spectra of EE Cam can be disentangled only with oscillation modes of l. =. 0, 1, and 2. Fifteen sets of rotational splits were found, and they contain five sets of l =. 1 multiplets and 10 sets of l. =. 2 multiplets. The rotational period of EE Cam is deduced to be P-rot = 1.84(-0.05)(+0.07) days. When we do model fittings, we use two nonradial oscillation modes (f11 and f32), and the fundamental radial mode f1. The fitting results show that c2 of the best-fitting model is much smaller than those of other theoretical models. The physical parameters of the best-fitting model are M-circle dot =. 2.04 Me, Z. =. 0.028, T-eff. =. 6433 K, logL L. = 1.416, R. =. 4.12 Re, log g = 3.518, and c2 = 0.00035. Furthermore, we find that f(11) and f(32) are mixed modes, which mainly characterize the features of the helium core. The fundamental radial mode f(1) mainly restricts the features of the stellar envelope. Finally, the acoustic radius t0 and the period separation.0 are determined to be 5.80 hr and 463.7 s, respectively, and the size of the helium core of EE Cam is estimated to be M-He. =. 0.181 M-circle dot and R-He. =. 0.0796 R-circle dot.