Astronomy 10 11.1.06 - Astronomy 10 More on Stars Most...

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Astronomy 10 More on Stars 11/1/06 Most stars are part of multiple star systems o Probably 80 to 95 percent of stars are part of multiple star systems o Some are easy and some are hard to recognized via changes in technology When you look at a classic double star, you see two stars o Revolving around each other o Although they are orbiting around the center of gravity between them, the brighter one is said to be the center because it is easier to detect All of the objects orbit around the center of mass even though there is nothing there o With stars, you usually have one massive star and one smaller star and they center of mass is closer to the more massive star o The angle between the star changes o Observe the change in motion through a spectroscope The stars are moving fast and they leave lines of light If you measure the lines you can see that they change The shift seen is called the Doppler Effect Star emits a pulse, and the pulse expands
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