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

Townes，Charles“用10微米干涉术和窄频带宽精确测量恒星大小和恒星周围物质”，AST-0097994伯克利公司独特的红外空间干涉仪将用于几种类型的高分辨率测量。这些措施包括在中红外(10微米)区域的狭窄光谱区域对旧恒星的直径进行干涉测量，以避免由于恒星大气中的气体而产生的谱线，并仅包括连续辐射。对谱线本身的测量可以用来确定星际气体的空间分布。最近，干涉仪上的基线扩大，可以准确测量恒星的大小。特别是，可以测量到最亮的米拉变星直径的变化，这应该会导致这些恒星偏离球形度的信息。在如此长的波长下工作的一个特别优势是，由于肢体变暗而产生的不确定度要小得多。

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.