来自原型脉动恒星Mira A的高速双极外流
A high-speed bi-polar outflow from the archetypical pulsating star Mira A
摘要：
光学图像和高色散光谱已经获得了围绕脉动AGB恒星Mira A的喷射物质。在远紫外线（FUV）GALEX图像中发现的恒星两侧的两个节点流，现在已经在Halalpha的光下清晰地成像。空间分辨的配置文件相同的线显示，大部分的这些结形成一个双极流出的径向速度极端的+- 150公里/秒相对于中央恒星。从观测者的角度来看，南流正在接近，北流正在后退。在新的Halalpha图像中的一个南流结的位置和它在以前的帕洛玛天文台巡天（POSS I）红板中的位置之间，已经注意到了一个远离米拉A的位移。如果解释为膨胀自行的结果，双极外流与天空平面倾斜69度± 2度，外流速度为160 ± 10 km/s，年龄约为1000年。
英文摘要：
Optical images and high-dispersion spectra have been obtained of the ejected material surrounding the pulsating AGB star Mira A. The two streams of knots on either side of the star, found in far ultra-viollet (FUV) GALEX images, have now been imaged clearly in the light of Halpha. Spatially resolved profiles of the same line reveal that the bulk of these knots form a bi-polar outflow with radial velocity extremes of +- 150 km/s with respect to the central star. The South stream is approaching and the North stream receding from the observer. A displacement away from Mira A between the position of one of the South stream knots in the new Halpha image and its position in the previous Palomar Observatory Sky Survey (POSS I) red plate has been noted. If interpreted as a consequence of expansion proper motions the bipolar outflow is tilted at 69deg +- 2deg to the plane of the sky, has an outflow velocity of 160 +- 10 km/s and is ~1000 y old.
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