File:White Dwarfs - Small and Strong.jpg
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DescriptionWhite Dwarfs - Small and Strong.jpg |
English: This chart shows data from NASA's Kepler space telescope, which looks for planets by monitoring changes in the brightness of stars. As planets orbit in front of a star, they block the starlight, causing periodic dips. The plot on the left shows data collected by Kepler for a star called KOI-256, which is a small red dwarf. At first, astronomers thought the dip in starlight was due to a large planet passing in front of the star. But certain clues, such as the sharpness of the dip, indicated it was actually a white dwarf -- the dense, heavy remains of a star that was once like our sun. In fact, in the data shown at left, the white dwarf is passing behind the red dwarf, an event referred to as a secondary eclipse. The change in brightness is a result of the total light of the system dropping.
The plot on the right shows what happens when the white dwarf passes in front of, or transits, the star. The dip in brightness is incredibly subtle because the white dwarf, while just over half as massive as our sun, is only the size of Earth, much smaller than the red dwarf star. The blue line shows what would be expected given the size of the white dwarf. The red line reveals what was actually observed: the mass of the white dwarf is so great, that its gravity bent and magnified the light of the red star. Because the star's light was magnified, the transiting white dwarf blocked an even smaller fraction of the total starlight than it would have without the distortion. This effect, called gravitational lensing, allowed the researchers to precisely measure the mass of the white dwarf. |
Date | |
Source | http://www.nasa.gov/mission_pages/kepler/multimedia/pia16886.html |
Author | NASA/Ames/JPL-Caltech |
Licensing[edit]
Public domainPublic domainfalsefalse |
This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.) | ||
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 09:33, 5 April 2013 | 3,000 × 2,400 (1.41 MB) | Stas1995 (talk | contribs) | User created page with UploadWizard |
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Orientation | Normal |
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Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop CS3 Windows |
File change date and time | 07:30, 4 April 2013 |
Color space | sRGB |
Image width | 3,000 px |
Image height | 2,400 px |
Date and time of digitizing | 00:30, 4 April 2013 |
Date metadata was last modified | 00:30, 4 April 2013 |
Unique ID of original document | xmp.did:DD94A3F484256811808382963A9B6E28 |