论文标题
在盖亚DR2中发现的不同年龄种群的对角线山脊模式，带有lamost的主要序列转弯和OB型星星
Diagonal Ridge pattern of different age populations found in Gaia DR2 with LAMOST Main-Sequence-Turn-Off and OB type Stars
论文作者
论文摘要
我们在$ gaia $中发现的对角线山脊功能（$ r，v_ϕ $平面中的对角线分布），并使用从lamost Galactic Specromoscoscic suveys选择的主序列转移和OB星之间的半乳酸距离和12 \ kpc的半乳酸距离和12 \ kpc。我们在$ r $ - $ v_ϕ $平面颜色颜色按平均径向速度编码中恢复脊图案，并发现此功能从非常年轻的（OB星，几百\，Myr）呈现为非常古老的人群（$τ$ = 9 $ - $ 14 \，gyr）。同时，金属性[fe/h]，[$α$/fe]和$ v_ {z} $发行版中也揭示了一些脊。在$ l_ {z}，v_ϕ $平面中，脊模式之一，具有恒定的角度动量每单位质量，显示出比较年龄种群不同的变化。但是，其余两个相对稳定，这意味着可能有两种具有不同动力学起源和进化的脊模式。
We revisit the diagonal ridge feature (diagonal distributions in the $R, v_ϕ$ plane) found in $Gaia$ and present timing analysis for it between Galactocentric distances of $R=7.5$ and 12 \,kpc, using Main-Sequence-Turn-Off and OB stars selected from the LAMOST Galactic spectroscopic surveys. We recover the ridge pattern in the $R$--$v_ϕ$ plane color coded by mean radial velocity and find this feature is presented from very young (OB stars, few hundred \,Myr) to very old populations ($τ$ = 9$-$14 \,Gyr). Meanwhile, some ridge features are also revealed in the metallicity [Fe/H], [$α$/Fe] and $v_{z}$ distributions. In the $L_{Z}, v_ϕ$ plane, one of the ridge patterns, with constant angular momentum per unit mass, shows variations with different age populations compared. However, the remaining two ones are relatively stable, implying there might have two kinds of ridge patterns with different dynamical origins and evolution.
