横跨南冕的恒星和尘埃
(原标题: Stars and Dust across Corona Australis)
2023-06-22
浏览次数: 15
宇宙尘埃云穿过一片丰富的恒星区域，这张望远镜拍摄的照片靠近南冕的北部边界。这个恒星形成区域是一个庞大的分子云复合体的一部分，距离我们只有500光年。这大约是更著名的恒星摇篮猎户座星云距离的三分之一。2度宽的框架将在云的估计距离上跨越15光年。与明亮的星云混合在一起的尘埃云有效地阻挡了来自银河系中更远的背景恒星的光线，并且遮挡了仍在形成过程中的嵌入恒星的视线。巨大的黑暗星云Bernes 157在左边。在它的右边是一组漂亮的反射星云，编号为NGC 6726、6727、6729和IC 4812。它们特有的蓝色是由于来自热恒星的光被宇宙尘埃反射而产生的。更紧凑的NGC 6729围绕着年轻的变星南冕星R。在它的下方，丝状弧线和环状物被确定为与高能新生恒星有关的赫比格哈洛天体。事实上，在这个区域的中心是冠状星团，它是最近和最活跃的恒星形成区域之一。
查看原文解释
Cosmic dust clouds cross a rich field of stars in this telescopic vista near the northern boundary of Corona Australis, the Southern Crown. Part of a sprawling molecular cloud complex this star forming region is a mere 500 light-years away. That's about one third the distance of the more famous stellar nursery known as the Orion Nebula. The 2 degree wide frame would span 15 light-years at the clouds' estimated distance. Mixed with bright nebulosities the dust clouds effectively block light from more distant background stars in the Milky Way and obscure from view embedded stars still in the process of formation. Large dark nebula Bernes 157 is on the left. To its right are a group of pretty reflection nebulae cataloged as NGC 6726, 6727, 6729, and IC 4812. Their characteristic blue color is produced as light from hot stars is reflected by the cosmic dust. The more compact NGC 6729 surrounds young variable star R Coronae Australis. Just below it, filamentary arcs and loops are identified as Herbig Haro objects associated with energetic newborn stars. In fact, at the heart of this area lies the Coronet Cluster, one of the nearest and most active star forming regions.
© Alessandro Cipolat Bares