标题： 银河盘中元素的分布 II。 从造父变星中的丰度的方位和径向变化 显示英文标题

标题： The Distribution of the Elements in the Galactic Disk II. Azimuthal and Radial Variation in Abundances from Cepheids

摘要： 本文报告了对船底座区域101个造父变星的光谱研究。 这些造父变星在数量上比以前的样本增加了约35%，并在银河系盘面覆盖范围上有所增加，特别是在l \approx 270{\deg }方向。 新发现的造父变星对径向梯度的信息增益不大，但显著增加了方位角覆盖范围。 我们在以太阳为中心、深度为1 kpc的环状区域内，从银河系中心出发80{\deg } 的角度范围内未发现丰度的方位角依赖性。 对造父变星数据进行简单线性拟合得到的梯度为d[Fe/H]/dRG = -0.055\pm 0.003 dex/kpc，这一梯度比我们之前较小的造父变星样本所得结果要平缓一些。 显示英文摘要

摘要： This paper reports on the spectroscopic investigation of 101 Cepheids in the Carina region. These Cepheids extend previous samples by about 35% in number and increase the amount of the galactic disk coverage especially in the direction of l \approx 270{\deg}. The new Cepheids do not add much information to the radial gradient, but provide a substantial increase in azimuthal coverage. We find no azimuthal dependence in abundance over an 80{\deg} angle from the galactic center in an annulus of 1 kpc depth centered on the Sun. A simple linear fit to the Cepheid data yields a gradient d[Fe/H]/dRG = -0.055 \pm 0.003 dex/kpc which is somewhat shallower than found from our previous, smaller Cepheid sample.