论文标题
估计Lamost M矮人的精确红色值
Estimating accurate reddening values of LAMOST M dwarfs
论文作者
论文摘要
矮人是太阳街道中的恒星的主要类型。它们是研究附近星际尘埃的分布和特性的出色示踪剂。在这项工作中，我们旨在从大天空区域多对象纤维光谱望远镜（Lamost）数据释放8（DR8）中获得高精度的红色恒星红色值。将lamost光谱与Gaia早期数据版本3（Gaia EDR3）的高质量光学光度结合在一起，我们估计了$ e（g _ {\ rm bp} -g _ {\ rm bp} -g _ {\ rm rp}）$ 641,426 m dwarfs langagor-a aingear-eare-learthning alfriths infords $ e（g _ {\ rm bp} -g _ {\ rm rm rp}）$ 641,426 m dwarfs。典型的红色不确定性仅为$ e（g _ {\ rm bp} -g _ {\ rm rp}）$中的0.03 mag。我们已经获得了红色系数$ r _ {（g _ {\ rm bp} -g _ {\ rm rp}）} $，它是恒星内在颜色$（g _ {\ rm bp} -g rm rp} {\ rm rp}）的函数。还为我们目录中的单个恒星提供了$ E（B-V）$的值。我们由此产生的高精度红色值以及Gaia可视性的红色值将非常强大，可以绘制太阳邻域中灰尘的细构造。
M dwarfs are the dominating type of stars in the solar neighbourhood. They serve as excellent tracers for the study of the distribution and properties of the nearby interstellar dust. In this work, we aim to obtain high accuracy reddening values of M dwarf stars from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Data Release 8 (DR8). Combining the LAMOST spectra with the high-quality optical photometry from the Gaia Early Data Release 3 (Gaia EDR3), we have estimated the reddening values $E(G_{\rm BP}-G_{\rm RP})$ of 641,426 M dwarfs with the machine-learning algorithm Random Forest regression. The typical reddening uncertainty is only 0.03 mag in $E(G_{\rm BP}-G_{\rm RP})$. We have obtained the reddening coefficient $R_{(G_{\rm BP}-G_{\rm RP})}$, which is a function of the stellar intrinsic colour $(G_{\rm BP}-G_{\rm RP})_0$ and reddening value $E(B-V)$. The values of $E(B-V)$ are also provided for the individual stars in our catalogue. Our resultant high accuracy reddening values of M dwarfs, combined with the Gaia parallaxes, will be very powerful to map the fine structures of the dust in the solar neighbourhood.
