论文标题
长时间Cepheid rs幼犬与其杰出的光相呼应的距离
The distance of the long period Cepheid RS Puppis from its remarkable light echoes
论文作者
论文摘要
银河系Cepheid RS Puppis是Leavitt Law（时期Luminosity关系）的特别重要的校准器。这是一个罕见的长时间脉动器（P = 41.5天），并且是在遥远星系中观察到的头孢虫的良好类似物。它是唯一已知的头孢虫嵌入在大的（〜0.5 pc）的尘土飞扬的星云中，它散布了脉动恒星的光。由于尘埃上的散射引入了轻度行进时间延迟，因此头上烙印壮观的光的亮度和颜色变化在星云上回荡。我在这里简要概述了这种现象的研究，尤其是通过使用HST/ACS摄像机获得的极化成像。这些观察结果使我们能够确定星云的几何形状和RS幼崽的距离。在Baade-Wesselink技术和Leavitt Law的校准的背景下，这种距离确定很重要。
The Milky Way Cepheid RS Puppis is a particularly important calibrator for the Leavitt law (the Period-Luminosity relation). It is a rare, long period pulsator (P=41.5 days), and a good analog of the Cepheids observed in distant galaxies. It is the only known Cepheid to be embedded in a large (~0.5 pc) dusty nebula, that scatters the light from the pulsating star. Due to the light travel time delay introduced by the scattering on the dust, the brightness and color variations of the Cepheid imprint spectacular light echoes on the nebula. I here present a brief overview of the studies of this phenomenon, in particular through polarimetric imaging obtained with the HST/ACS camera. These observations enabled us to determine the geometry of the nebula and the distance of RS Pup. This distance determination is important in the context of the calibration of the Baade-Wesselink technique and of the Leavitt law.
