Astronomy Picture of the Day——南冕座的恒星与尘埃

Stars and Dust in Corona Australis 
Image Credit & Copyright: CHART32 Team

Explanation: Cosmic dust clouds and young, energetic stars inhabit this telescopic vista, less than 500 light-years away toward the northern boundary of Corona Australis, the Southern Crown. The dust clouds effectively block light from more distant background stars in the Milky Way. But the striking complex of reflection nebulae cataloged asNGC 6726, 6727, and IC 4812 produce a characteristic blue color as light from the region's young hot stars is reflected by the cosmic dust. The dust also obscures from view stars still in the process of formation. At the left, smaller yellowish nebula NGC 6729 bends around young variable star R Coronae Australis. Just below it, glowing arcs and loops shocked by outflows from embedded newborn stars are identified as Herbig-Haro objects. On the sky this field of view spans about 1 degree. That corresponds to almost 9 light-years at the estimated distance of the nearby star forming region.

南冕座的恒星与尘埃 

这幅由望远镜拍摄的照片显示的是南冕座的北界附近的景象，其中可以看到大量宇宙尘埃云和年轻的活跃恒星，距离地球不到500光年。尘埃云遮挡了更远处的恒星。这一引人注目的复合体由反射星云NGC 6726、NGC 6727和IC 4812 构成，因宇宙尘埃对这一区域中年轻炽热恒星的星光反射而呈现出标志性的蓝色。尘埃遮挡了仍然处于形成过程中的恒星。左侧较小的黄色星云NGC 6729环绕着年轻的变星南冕座R。在其下面，受到内部新生恒星喷流冲击的发亮的弧形和环形被确认为赫比格-阿罗天体。照片对应天空中约1°的范围，在估算的恒星生成区的距离上相当于约9光年的尺度。

高清原图地址：

https://apod.nasa.gov/apod/image/2001/NGC6726_Schedler_3400.jpg

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