We investigated the dependence of the parameters of the segments of spiral arms of the Galaxy on the age of classical Cepheids. The catalog of Cepheids (Mel’nik et al.) was divided into two samples— relatively young (P > 9^d) and relatively old (P < 9^d) objects. The parameters of the spiral structure were determined both for two samples separately and jointly for the combination of two systems of segments traced by young and old objects. For most of the segments, their parameters for young and old objects differ significantly. Taking into account the difference between the two segment systems, we obtained the estimate R ₀ equal to kpc, which in the modern Large Magellanic Cloud (LMC) calibration corresponds to the value of kpc. It is shown that the displacement between the segments is not reduced to the effect of differential rotation only. To interpret this displacement for objects of Perseus and Sagittarius-2 segments, we carried out a dynamic modeling of the change in the position of the segment points when moving in the smooth gravitational field of the Galaxy. At the angular velocity of rotation of the spiral pattern Ω_p = 25.2 0.5 km s⁻¹ kpc⁻¹ (Dambis et al.) the observed displacement between segments on young and old objects can be explained by the amplitude of spiral perturbations of the radial velocity of u = 10 1.5 km s⁻¹. For the constructed double system of spiral segments, it is demonstrated that the assumption of constancy of the pitch angles within each segment and the assumption that the pole of the spiral pattern is in the direction of the nominal center of the Galaxy do not contradict the data within the range of uncertainty.

我们研究了银河系旋臂段参数对经典造父变星年龄的依赖性。造父变星的目录（Mel'nik 等人）被分为两个样本——相对年轻的（P > 9 ^d）和相对老的（P < 9 ^d）天体。螺旋结构的参数分别针对两个样本确定，同时针对年轻和老对象跟踪的两个系统段的组合确定。对于大多数片段，它们的年轻和老对象参数显着不同。考虑到两个分段系统之间的差异，我们得到的估计值R ₀等于kpc，在现代大麦哲伦星云 (LMC) 校准中对应于kpc 的值。结果表明，段之间的位移并没有减少到仅差速旋转的影响。为了解释 Perseus 和 Sagittarius-2 段的物体的这种位移，我们对在平滑的银河引力场中移动时段点位置的变化进行了动态建模。在螺旋图案的旋转角速度 Ω _p = 25.2 0.5 km s ^-1 kpc ^-1（Dambis 等人）下，观察到的年轻和老物体上的片段之间的位移可以通过径向螺旋扰动的幅度来解释u的速度= 10 1.5 km s ^-1. 对于所构建的螺旋线段双系统，证明了每个线段内螺距角恒定的假设和螺旋模式的极点在银河系标称中心方向的假设与数据不矛盾在不确定范围内。