论文标题
Cepheid V1033 Cyg的进化状态和基本参数
Evolutionary status and fundamental parameters of the Cepheid V1033 Cyg
论文作者
论文摘要
根据一致的恒星进化和非线性恒星脉动计算，Cepheid V1033 Cyg被证明是在氦芯重力收缩期间第一次穿越不稳定带的第一个交叉处的后序列恒星。 V1033 CYG观察到的光变异性是由于基本模式下的径向振荡引起的。在最近的观察结果和对周期变化率的理论估计之间的最佳一致性（在百分之一范围之内），分别获得了恒星质量$ m = 63m _ \ odot $以及氦气和更重的元素丰度$ y = 0.28 $和$ z = 0.022 $。恒星的年龄，光度，半径，有效温度和表面重力为$ t_ \ mathrm {ev} = 5.84 \ times 10^7 $ yr，$ l = 2009l_ \ odot $，$ r = 45.6r_ \ odot $，odot $，$ t_ \ t_ \ nationrm {$ t_ \ mathrm {$ { g = 1.92 $。
On the basis of consistent stellar evolution and nonlinear stellar pulsation calculations the Cepheid V1033 Cyg is shown to be the post--main sequence star at the first crossing of the instability strip during gravitational contraction of the helium core. The observed light variability of V1033 Cyg is due to radial oscillations in the fundamental mode. The best agreement (within one percent) between recent observations and the theoretical estimate of the period change rate was obtained for the evolutionary sequence with stellar mass $M=6.3M_\odot$ and helium and heavier element fractional abundances $Y=0.28$ and $Z=0.022$, respectively. The age of the star, the luminosity, the radius, the effective temperature and the surface gravity are $t_\mathrm{ev}=5.84\times 10^7$ yr, $L=2009L_\odot$, $R=45.6R_\odot$, $T_\mathrm{eff}=5726 \mathrm{K}$, $\log g=1.92$.
