Precision Measurement of Stellar Sizes and Circumstellar Material with 10 micron Interferometry and Narrow Frequency Bandwidths

Townes, Charles“利用 10 微米干涉测量和窄频带宽精确测量恒星尺寸和星周材料”AST-0097994伯克利独特的红外空间干涉仪将用于多种类型的高分辨率测量。其中包括在中红外（10微米）区域的狭窄光谱区域中对老恒星直径进行干涉测量，选择该区域是为了避免恒星大气中的气体造成的谱线，并且仅包括连续谱辐射。对谱线本身的测量可用于确定星周气体的空间分布。最近扩大的干涉仪基线可以精确测量恒星的大小。特别是，可以测量最亮的米拉变星直径的变化，这些变化应该会导致有关这些恒星球形度偏离的信息。在如此长的波长下工作的一个特殊优点是，由于临边变暗而导致的不确定性要小得多。

Townes, Charles" Precision Measurement of Stellar Sizes and Circumstellar Material with 10 Micron Interferometry and Narrow Frequency Bandwidths"AST- 0097994Berkeley's unique Infrared Spatial Interferometer will be used for several types of high-resolution measurements. These include interferometric measurement of the diameters of old stars in narrow spectral regions of the mid-infrared (10 micron) region chosen to avoid spectral lines due to gases in the atmospheres of stars and to include only continuum radiation. Measurements on the spectral lines themselves can be used to determine the spatial distribution of the circumstellar gas. Recently enlarged baselines on the interferometer allow accurate measurement of stellar sizes. In particular, changes in the diameter of the brightest Mira variables can be measured and these should lead to information about departures from the sphericity of these stars. One particular advantage of working at such long wavelengths is that the uncertainties due to limb darkening are much smaller.