File:Hubble sees a cosmic caterpillar.jpg
原始文件 (2,938 × 1,892像素,文件大小:5.65 MB,MIME类型:image/jpeg)
摘要
描述Hubble sees a cosmic caterpillar.jpg |
English: This light-year-long knot of interstellar gas and dust resembles a caterpillar on its way to a feast. But the meat of the story is not only what this cosmic caterpillar eats for lunch, but also what's eating it. Harsh winds from extremely bright stars are blasting ultraviolet radiation at this "wanna-be" star and sculpting the gas and dust into its long shape.
The culprits are 65 of the hottest, brightest known stars, classified as O-type stars, located 15 light-years away from the knot, towards the right edge of the image. These stars, along with 500 less bright, but still highly luminous, B-type stars make up what is called the Cygnus OB2 association. Collectively, the association is thought to have a mass more than 30 000 times that of our Sun. The caterpillar-shaped knot, called IRAS 20324+4057, is a protostar in a very early evolutionary stage. It is still in the process of collecting material from an envelope of gas surrounding it. However, that envelope is being eroded by the radiation from Cygnus OB2. Protostars in this region should eventually become young stars with final masses about one to ten times that of our Sun, but if the eroding radiation from the nearby bright stars destroys the gas envelope before the protostars finish collecting mass, their final masses may be reduced. Spectroscopic observations of the central star within IRAS 20324+4057 show that it is still collecting material quite heavily from its outer envelope, hoping to bulk up. Only time will tell if the formed star will be a "heavy-weight" or a "light-weight" with respect to its mass. This image of IRAS 20324+4057 is a composite of Hubble Advanced Camera for Surveys (ACS) data taken in green and infrared light in 2006, and ground-based hydrogen data from the Isaac Newton Telescope in 2003, as part of the IPHAS H-alpha survey. The object lies 4500 light-years away in the constellation of Cygnus (The Swan). |
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来源 | http://www.spacetelescope.org/images/opo1335a/ |
作者 | NASA, ESA, the Hubble Heritage Team (STScI/AURA), and IPHAS |
其他版本 |
许可协议
ESA/Hubble images, videos and web texts are released by the ESA under the Creative Commons Attribution 4.0 International license and may on a non-exclusive basis be reproduced without fee provided they are clearly and visibly credited. Detailed conditions are below; see the ESA copyright statement for full information. For images created by NASA or on the hubblesite.org website, or for ESA/Hubble images on the esahubble.org site before 2009, use the {{PD-Hubble}} tag.
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描繪內容
30 8 2013
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宽度 | 2,938 px |
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高度 | 1,892 px |
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压缩方案 | LZW |
像素构成 | RGB |
方向 | 标准 |
色彩组分数 | 3 |
水平分辨率 | 300 dpi |
垂直分辨率 | 300 dpi |
数据排列 | chunky format |
使用软件 | Adobe Photoshop CS6 (Macintosh) |
文件修改日期时间 | 2013年8月27日 (二) 13:32 |
色彩空间 | sRGB |
数字化日期时间 | 2013年8月16日 (五) 06:42 |
原始数据最后修改日期 | 2013年8月27日 (二) 09:32 |
原始文件唯一ID | xmp.did:E34A25070E206811808396D4100A57C6 |