File:Gas Shell Around Z Cam.jpg
原始檔案 (1,800 × 1,800 像素,檔案大小:1.98 MB,MIME 類型:image/jpeg)
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[編輯]描述Gas Shell Around Z Cam.jpg |
English: This enhanced image from the far-ultraviolet detector on NASA's Galaxy Evolution Explorer shows a ghostly shell of ionized gas around Z Camelopardalis, a binary, or double-star system featuring a collapsed, dead star known as a white dwarf, and a companion star.
The image was processed to enhance the diffuse emissions from the shell. Z Cam is the bright object near the center of the image. Parts of the shell are seen as a lobe-like, light- blue feature below and to the right of Z Cam, and as two large, light blue, perpendicular lines on the left. The massive shell around Z Cam provides evidence of material ejected during and swept up by a powerful nova eruption, called a classical nova, which likely occurred a few thousand years ago. In exploding binary systems, one of the two stars steals material from the other until it builds up to a certain level; at that point, the system erupts in a giant inferno. In the case of Z Cam, the white dwarf is pilfering material from its sedate companion. There are two classes of exploding binary star systems, or cataclysmic variables: recurrent dwarf novae, which erupt in small, "hiccup-like" blasts episodically, and classical novae, which undergo huge explosions thousands of times more powerful than dwarf novae. Z Cam was the one of the first known recurrent dwarf novae. Yet the shell of ionized gas around Z Cam detected by the Galaxy Evolution Explorer can only be explained as the remnant of a full-blown classical nova explosion. The discovery of the shell provides the first evidence that some binary systems undergo both types of explosions. Previously, a link between the two types of novae had been predicted, but there was no evidence to support the theory. The Galaxy Evolution Explorer first began imaging Z Cam in 2003; this image was taken on Jan. 25, 2004. The type of emission found around Z Cam is most easily visible at far- ultraviolet wavelengths. Most of the background galaxies and stars have been eliminated by the image processing, although a few linger as white spots near the top. The light-blue streaky clump in the bottom right corner is created by ultraviolet light reflected by dust. It is uncertain if Z Cam is the source of the dust-scattered light. |
日期 | |
來源 | http://www.galex.caltech.edu/media/glx2007-01r_img03.html |
作者 | NASA/JPL-Caltech/T. Pyle(SSC)/R. Hurt(SSC) |
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[編輯]Public domainPublic domainfalsefalse |
本作品由NASA創作,屬於公有領域。根據NASA的版權政策:“NASA的創作除非另有聲明否則不受版權保護。”(參見:Template:PD-USGov/zh,NASA版權政策或JPL圖像使用政策) | ||
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目前 | 2011年6月30日 (四) 15:44 | 1,800 × 1,800(1.98 MB) | Spitzersteph(對話 | 貢獻) |
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寬度 | 1,800 px |
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高度 | 1,800 px |
壓縮方式 | 未壓縮 |
像素合成 | RGB |
方位 | 標準 |
像素數量 | 3 |
水平解析度 | 300 dpi |
垂直解析度 | 300 dpi |
資料排列 | 矮胖格式 |
使用軟體 | Adobe Photoshop CS3 Macintosh |
檔案修改日期時間 | 2008年3月3日 (一) 18:07 |
色彩空間 | 顏色未校準 |