利用恒星系综绘制$R_V$的色轨迹方法
A Color-locus Method for Mapping $R_V$ Using Ensembles of Stars
摘要：
我们提出了一个简单而有效的技术来测量整个天空中的$R_V$的角度变化。我们从泛星1目录划分到Healpix像素的恒星，并确定后验分布的红化和$R_V$为每个像素使用两个独立的蒙特卡罗方法。我们发现这两种方法是自洽的限制，他们预计将执行类似的。我们还发现一些协议与高精度的光度研究$R_V$在英仙座和蛇夫座，以及与地图的红化附近的银河系平面的基础上恒星光谱从APOGEE。虽然目前对$R_V$的研究大多仅限于孤立的云，但我们已经开发了一种系统的方法来比较大多数可观察到的尘埃的$R_V$值。这是一个更严格的银河系红化地图的概念证明。
英文摘要：
We present a simple but effective technique for measuring angular variation in $R_V$ across the sky. We divide stars from the Pan-STARRS1 catalog into Healpix pixels and determine the posterior distribution of reddening and $R_V$ for each pixel using two independent Monte Carlo methods. We find the two methods to be self-consistent in the limits where they are expected to perform similarly. We also find some agreement with high-precision photometric studies of $R_V$ in Perseus and Ophiuchus, as well as with a map of reddening near the Galactic plane based on stellar spectra from APOGEE. While current studies of $R_V$ are mostly limited to isolated clouds, we have developed a systematic method for comparing $R_V$ values for the majority of observable dust. This is a proof of concept for a more rigorous Galactic reddening map.x
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