Red giant - Wikipedia, the free encyclopedia
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A red giant is a luminous giant star of low or intermediate mass (roughly 0.5–10 solar masses) that is in a late phase of stellar evolution. The outer atmosphere is inflated and tenuous, making the ...
en.wikipedia.org/wiki/Red_giant
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The short answer is Running out of hydrogen. Most stars (like our sun) are in the "hydrogen burning" phase of their life. That is to say they are converting Hydrogen into Helium by nuclear fusion. This releases a lot of energy. Th...
http://wiki.answers.com/Q/What_makes_a_star_become_a_re...
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Department of Astronomy: AST 1002 Course Readings ... Note that this exam was based on a different textbook that the one being used this semester, so the emphasis on material may have been slightly different than in our course. ... 26. A star starts to become a red giant when...
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www.physics.rutgers.edu/ugrad/110/midterm.html
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Two of the World's Largest Interferometric Facilities Team-up to Study a Red Giant Star ... The astronomers observed S Ori with two of the largest interferometric facilities available: the ESO Very Large Telescope Interferometer (VLTI) at Paranal, observing in the near- and mid-infrared, and the NRAO-operated Very...
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www.eso.org/public/outreach/press-rel/pr-2007/pr-25-07....
www.eso.org/public/outreach/press-rel/pr-2007/pr-25-07.html
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The red supergiant star Betelgeuse, the bright reddish star in the constellation Orion, has steadily shrunk over the past 15 ... He speculated that the measurements may be affected by giant convection cells on the star's surface that are like convection granules on the sun, but so large that they bulge out of the surface.
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www.physorg.com/news163823639.html
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The new discovery is helping astronomers to understand what will happen to the planets in our solar system when our Sun becomes a red-giant star, expanding so much that its surface will reach as far as Earth's orbit.
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www.sciencedaily.com/releases/2007/08/070802182031.htm
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Only a few 1,000 years are needed for the temperature of a star to grow to 30,000K. At this temperature, the star begins to emit large quantities of UV radiation. ... As the red giant star continues to expand it will exceed its Roche limit and hydrogen gas will stream across to the white dwarf, spiraling inward to form...
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zebu.uoregon.edu/~js/ast122/lectures/lec17.html
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Images of Chi Cygni reveal Sol's fate; Cambridge MA (SPX) Dec 16, 2009; About 550 light-years from Earth, a star like our Sun is writhing in its death throes. Chi Cygni has swollen in size to become a red giant star so large that it would swallow every planet out to Mars in our solar system.
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Don't panic, we've got another 7 billion years or so before the Sun becomes a red giant star. ... A red giant will expand outward many times its original size. Our own Sun, for example will grow so large that it engulfs the orbits of Mercury, Venus and even Earth; although, it's not certain if Earth will actually be...
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www.universetoday.com/guide-to-space/stars/red-giant-st...
www.universetoday.com/guide-to-space/stars/red-giant-star/
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