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度精确测量恒星尺寸和星周物质“AST-0097994伯克利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）区域的窄光谱区域内对老恒星直径进行干涉测量，以避免恒星大气中气体产生的光谱线，并只包括连续辐射。对光谱线本身的测量可以用来确定星周气体的空间分布。最近扩大的干涉仪基线允许精确测量恒星的大小。特别是，最明亮的米拉变量的直径的变化可以测量，这些应该导致偏离这些恒星的球度的信息。在如此长的波长下工作的一个特别的优点是，由于临边暗化引起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.