Red giant stars
Red Giant (RG) stars result from low- and intermediate-mass Main Sequence stars of around 0.5-5 solar masses.
Red Giant
Related Category: Astronomy: General
star that is relatively cool but very luminous because of its great size. All normal stars are expected to pass eventually through a red-giant phase as a consequence of stellar evolution.
Red giant
Artist's conception of the remains of artificial structures on the Earth after the Sun enters its red giant phase and swells to roughly 100 times its current size.
red giant
Home ... Science and Technology Astronomy and Space Exploration Astronomy: General ...
Essential reading Compare
side-by-side The Oxford Pocket Dictionary ... A Dictionary of Astronomy The Columbia Encyclopedia, ...
Red giant
From Wikipedia, the free encyclopedia
Jump to: navigation, search ...
Red giant
edit this page
History
You may also be looking for a red supergiant.
What is a "Red Giant"?
Briefly, it is a stage in the lifespan of a star. I was soon to find there was a lot more to this subject than I'd realised however...
Definition: red giant: A star that has low surface temperature and a diameter that is large relative to the Sun.
Space Tragedies9 Planets in Nine DaysAstronomy 101
Related Articles ...
Red giant
Wikipedia, the free encyclopedia - Cite This Source
A red giant is a luminous giant star of low or intermediate mass that is in a later phase of its evolution, ...
Can you please tell me in plain language what a Red Giant is?
The Answer ...
red giant branch The section of the evolutionary track of a star corresponding to intense hydrogen shell burning, which drives a steady expansion and cooling of the outer envelope of the star.
red giant
a cool star near the end of its life cycle that has expanded to a size of a few dozen to a hundred times the diameter of the sun
red supergiant ...
RED GIANT - Giant star in the later stages of stellar evolution after it has left the main sequence.
Red giant star: a star that is larger than the sun and red because it has a lower temperature
White dwarf star: a small star, about the size of Earth; one of the last stages of a star's life ...
Red Giant
(a) Large, highly luminous but relatively cool star that has reached a late stage in its "life". It is running out of nuclear "fuel" and has accordingly expanded greatly and become less dense.
Red Giant: A very large, distended, and relatively cool star which is in the final stages of its life. A typical red giant, if placed where the Sun is in our solar system, might extend past the orbit of Mars.
red giant
A relatively cool star which is near the end of its life, swelling in size after the inner core has been depleted of hydrogen.
red giant
A star that has low surface temperature and a diameter that is large relative to the Sun.
Red Giant
a stage in the evolution of a star when the fuel begins to exhaust and the star expands to about fifty times its normal size. The temperature cools, which gives the star a reddish appearance.
Red giant. A star that is large and cool compared with the Sun but is many times the diameter of the Sun. These are stars that are nearing the end of their lives.
RED GIANT STAR
A red giant is a relatively old star whose diameter has swollen enormously. It's temperature has also cooled appreciably, it's contracting hydrogen core has turned to helium and eventually to carbon.
Red Giants
Finally we get to the red giant stage; I know you have been waiting for this for some time, so just try to stay calm.
Red giant- an old star whose outer layers have billowed out and cooled down
Red shift- shift in the light of a retreating object toward red wavelengths, caused by the Doppler effect
Reflector- a telescope that forms an image with mirrors ...
M4 (red giants stand out nicely)
M6 (tested seeing low over horizon, bright orange star on one side of the cluster of blue stars)
Trifid Nebula (beautifully defined dust lanes) ...
Red giants can have strong ``winds'' that dispel more mass than all of the stellar winds that occurred during the long main sequence stage.
Red giant or supergiant stars with degenerate neutron cores, often abbreviated TZO's. If they exist, such objects would be nearly impossible to identify observationally.
References ...
Red giants form from the remains of most stars, at least for a while, and are a remarkable machine in the clockwork of the universe. Our Sun has been shining now for, it is estimated, some 5 billion years.
red giant star An evolved star that has exhausted the hydrogen fuel in its core and is powered by nuclear reactions in a hot shell around the stellar core.
Red Giant Branch (RGB)
The Helium Flash and Triple Alpha Process
Horizontal Branch (HB)
Asymptotic Giant Branch (AGB) ...
Red Giant Star
An old, bright star, much larger and cooler than the Sun. Betelgeuse (alpha Orionis) is an example of a red giant.
Redshift ...
Red giant
A red giant is a luminous giant star of low or intermediate mass that is in a late phase of stellar evolution.
Red giant: The phase of a star when all the core hydrogen is used up and the star becomes enlarged. It cycles between shell burning and core burning of successivly heavier elements, up to iron. The number of cycles depends on the mass of the star.
red giant - (n.)
A post-main-sequence stage of the lifetime of a star; the star becomes relatively bright and relatively cool.
redshift - (n.) ...
Red Giant: A star with low surface temperature (thus red) and large size (giant). These stars are found on the upper-right hand side of the HR diagram. The red giant phase in a star's life occurs after it has left the main sequence.
All red giants are variable stars. The core keeps on contracting and heating up until it is hot enough for the triple-alpha process (also known as helium flash) to take place.
"The red giant is so swollen that its outermost atmosphere is just leaking away into space," says Adam Hill at Joseph Fourier University in Grenoble, France.
(a) A red giant in the constellation Cetus that varies in brightness as it pulsates. When brightest, Mira is visible to the naked eye; when dimmest, Mira can be viewed only with optical aid.
Image of the red giant Betelgeuse. It has a diameter equal to that of Jupiter's orbit around the Sun. (© Hubble Space Telescope) While the core is being compressed the outer layers of the Sun will expand.
The gases of red giants can circulate upward to the tops of the stars, carrying the by-products of nuclear fusion with them. Oxygen is normally more abundant than carbon.
Leaving MS, up Red Giant Branch (RGB) first time
H fuel exhausted in core
core contracts, H burns in shell, powerful
envelope expands & cools
Red Giant (Rstar ~ 1 AU), luminous (Lstar ~ 103 Lsun) ...
Aging Stars and Red Giants (Check the study guide for this lesson)
The population of stars in our neighborhood is like the population of people in your neighborhood. They are born at different times so they have different ages.
red giant stars (NASA Thesaurus) Stars whose evolution has progressed to the point where hydrogen core burning has been completed, the helium core has become denser and hotter than originally, ...
Gacrux is a cool red giant star of spectral and luminosity type M3.5 III (but was once thought to be a "bright giant" of luminosity type II).
Mira is a type M red giant star. It is the prototype star for the long period "Mira" variables. Mira variables vary in brightness by typically 5 to 6 magnitudes, but sometimes as much as 9 magnitudes.
Mu Cephei Deep Red Giant
The region of sky near the star Mu Cephei, with a nebula known as IC 1396.
Click on image for star map
© Matt BenDaniel ...
Eta Geminorum is a red giant, about 50 times the size of the Sun, at a distance of 280 light years. It is a visual binary and a variable (details below).
The binary gamma Leo, called Algieba (the lion's mane), is a magnificent pair, which compenents consists of a orange-red giant of 2.6 mag brightness and a yellow giant with 3.8 mag.
Once massive stars reach the red giant phase, the core temperature continues to increase as carbon atoms are formed from the fusion of helium atoms.
Since globular clusters normally contain ancient red giants, they provide a fossil record of the formation and evolution of galaxies.
It is a red giant approximately 420 light-years distant from Earth. Its maximum magnitude can reach 2.0, making it one of the brightest stars in the sky, and then drop to 10.1 and make the star invisible to the naked eye.
This will cause it to contract and then expand into a red giant. In doing so, it will swallow up all the inner planets and eventually destroy the whole solar system. Surely then all trace of us will have gone for good? Well not quite.
The V-band light from old populations (ellipticals, spiral nuclei and bulges) is about evenly split between red giants and main-sequence stars.
A red giant core is degenerate ionized helium, surrounded by a shell of hydrogen fusion, that expands the outer atmosphere in response to higher core temperatures.
They now think that the Sun will not engulf us when it becomes a red giant, as previously believed. But this will be small comfort. In its retirement from normal core fusion, our previously nurturing star will care little for its planetary children.
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. Moreover, it has begun to pulse dramatically in and out, beating like a giant heart.
In the final transition strange changes occur--the star becomes a "red giant," diffuse and enormously large, and later much of the material is blown to space where it forms a "planetary" nebula, but there is no explosion.
4 solar masses usually evolves from a red giant to a white dwarf when its outer layers drift away and leave behind a hot, compact core.
When that fuel is exhausted the sun will change: As the outer layers expand to the orbit of the earth or beyond, the sun will become a red giant star, slightly cooler at the surface than at present and 10,000 times brighter.
A red giant star in Taurus. Its name is derived from Arabic "the follower", a reference to the way the star follows the Pleiades star cluster in its nightly journey across the sky.
If a star is above the Chandrasekhar's limit at the end of its life, outwardly it will appear like a red giant (see part 2) but inside its core will be shrinking and triggering nuclear fusion reactions.
 See also: Giant, Star, Sun, Light, Mass
|
