本帖最后由 gohomeman1 于 2009-8-13 09:45 编辑
12 January 2009: The Trapezium Cluster
2009.1.12:猎户座四合星团
The Orion Nebula is arguably the finest of all nebulae within the MilkyWay visible from the Northern Hemisphere. With a gaseous repository of10 000 suns, and illuminated by a cluster of hot young stars, the clouds of Messier 42 — as it is also known — glow with fantastic colours and shapes, giving us a bird's eye view of one of the greatest star forming nurseries in our part of the Milky Way.
在北天球,猎户座大星云无可置疑的是银河系最美丽的星云。这个著名的大星云又名梅西耶星表42#(简写M42),包含近10万太阳质量的气体,被中央年轻的蓝巨星照亮,呈现出斑斓的色彩和奇特的外形,让我们能够鸟瞰银河系最大的恒星幼儿园中的一个。
Messier 42 is a complex of glowing gas, mostly hydrogen but also helium, carbon,nitrogen, and oxygen in decreasing amounts, located 1500 light years away. At its very heart, we find the Trapezium, a group of four very hot stars that illuminate the nebula. They are the brightest of an extended cluster of several thousand young stars many of which lie unseen within the opaque gas and dust. Amazingly, whilst the Orion Nebula is easy to identify with the unaided eye, there is apparently no written record of its existence before the 17th century.
M42离我们约1500光年,由发光的气体组成,主要是氢H,含量依次减少的元素还有氦He、碳C、氮N和氧O等。在其心脏区域是四合星团,由四颗极为炽热的蓝巨星组成,照亮了整个星云。它们是由数千颗恒星组成的星团中最大的四颗,这个星团大部分隐没在M42的气体和尘埃后面。奇怪的是,虽然M42很容易就能用肉眼看见,它们却从没在17世纪以前的文献中出现。
This image is based on data acquired with the 1.5 m Danish telescope at the ESO La Silla Observatory in Chile, through three filters (B: 60 s,V: 30 s, R: 21 s). East is at the upper right corner and North is at the lower right. This image in high-resolution is available in the image archive.
本图由位于智利的ESO拉斯拉天文台的1.5米“丹麦”望远镜拍摄,由3个滤光通道的图像合成(曝光时间:蓝60秒,绿30秒,红21秒)。照片中的天球方位:东——右上,北——右下。本图的高清链接在下一楼可见。
Credit: ESO/IDA/Danish 1.5 m/R.Gendler, J.-E. Ovaldsen, and A. Hornstrup |