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Topic: Red giant


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  First glimpse of the dynamics of a red giant
Red giants have hot, dense stellar cores which are surrounded by vast, diffuse stellar envelopes.
The principal interest of this simulation for the LCSE team was the potentially global nature of the stellar convection, its potential coupling to global modes of radial pulsation of the stellar envelope, and the strong effects of compressibility of the gas which result from the nearly sonic gas motions induced, especially near the stellar surface.
The red giant simulation therefore advanced not only the frontier of stellar astrophysics but also a frontier of parallel computation, exploiting the DSM hardware and the shared memory programming model to achieve nearly transparent computational load balancing over 128 powerful CPUs.
www.lcse.umn.edu /research/RedGiant   (2954 words)

  
  Red giant - Wikipedia, the free encyclopedia
According to the Hertzsprung-Russell diagram, a red giant is a large non-main sequence star of stellar classification K or M; so-named because of the reddish appearance of the cooler giant stars.
They are believed to be stars of near solar mass or higher which have exhausted the supply of hydrogen in their cores and switched to fusing hydrogen in a shell outside the core.
Stars of spectral types O through K are believed to become red giants (or supergiants in the case of O and B stars).
en.wikipedia.org /wiki/Red_giant   (556 words)

  
 red giant
A giant star with a surface temperature of 2,500 to 3,500°C, a spectral type of M or K, and a diameter between 10 and 100 times times that of the Sun.
Red giants represent a late stage in the evolution of stars with a range of masses, from just under the mass of the Sun to tens of solar masses (see stars, evolution of).
The largest red giants, which form from the most massive of stars, are known as red supergiants.
www.daviddarling.info /encyclopedia/R/redgiant.html   (209 words)

  
 Red Giant Encyclopedia Article @ HigherPower.org   (Site not responding. Last check: 2007-10-26)
They are believed to be stars of near solar mass or higher which have exhausted the supply of hydrogen in their cores and started fusing helium in a shell outside the core.
Red dwarfs (of spectral type M), and possibly even the cooler of the K orange dwarfs as well may not have enough mass to initiate helium fusion, and therefore rather than become red giants, may simply burn out as they die.
Stars may enter a red giant phase several times if they are capable of fusing elements more massive than helium in their cores.
higherpower.org /encyclopedia/Red_giant   (560 words)

  
 Great Red Spot - Wikipedia, the free encyclopedia
The Great Red Spot is an anticyclonic hypercane on the planet Jupiter, 22° south of the equator, which has lasted at least 340 years.
This dramatic view of Jupiter's Great Red Spot and its surroundings was obtained by Voyager 1 on February 25, 1979, when the spacecraft was 5.7 million miles (9.2 million kilometers) from Jupiter.
The Great Red Spot should not be confused with the Great Dark Spot, famously seen in the atmosphere of Neptune by Voyager 2 in 1989.
en.wikipedia.org /wiki/Great_Red_Spot   (882 words)

  
 First glimpse of the dynamics of a red giant
Red giants have hot, dense stellar cores which are surrounded by vast, diffuse stellar envelopes.
The principal interest of this simulation for the LCSE team was the potentially global nature of the stellar convection, its potential coupling to global modes of radial pulsation of the stellar envelope, and the strong effects of compressibility of the gas which result from the nearly sonic gas motions induced, especially near the stellar surface.
The red giant simulation therefore advanced not only the frontier of stellar astrophysics but also a frontier of parallel computation, exploiting the DSM hardware and the shared memory programming model to achieve nearly transparent computational load balancing over 128 powerful CPUs.
pinot.lcse.umn.edu /research/RedGiant   (2954 words)

  
 Imaging the Surfaces of Stars
Because red giant and supergiant stars present the largest angular diameters in the sky, they are the first stars apart from the Sun to have been imaged, albeit so far with angular resolution just sufficient to resolve their disks.
2.5 for the red giant Mira and the red supergiant Betelgeuse.
Although the radio photospheres of red giant stars have yet to be imaged, Reid and Menten (1997) have partially resolved the radio photosphere of the red giant W Hydra.
www.ras.ucalgary.ca /SKA/science/node14.html   (2290 words)

  
 red giant concept from the Astronomy knowledge base   (Site not responding. Last check: 2007-10-26)
Red giants are post-main-sequence stars that have exhausted the nuclear fuel in their cores.
Red giants in a globular cluster are about 3 times more luminous than RR Lyrae stars in the same cluster.
Mira is the prototype of all pulsating red giants, which are called Miras in its honor., A irregular long-period intrinsic variable.
www.site.uottawa.ca:4321 /astronomy/redgiant.html   (426 words)

  
 AllRefer.com - red giant (Astronomy, General) - Encyclopedia
red giant, star that is relatively cool but very luminous because of its great size.
Although most giant stars are red, some prominent giant stars are other colors near the red end of the spectrum, e.g., Arcturus (orange), Aldebaran (orange), and Capella (yellow).
Blue supergiants, e.g., Rigel, are young stars on the main sequence of the Hertzsprung-Russell diagram, whereas red supergiants, e.g., Betelgeuse and Antares, are old, highly evolved stars.
reference.allrefer.com /encyclopedia/R/redgiant.html   (277 words)

  
 AAVSO: Variable Star of the Month, EU Delphini
The first pulsating red giant variable star (Mira) was discovered in 1596 by David Fabricius (1564-1617) -- the 400th anniversary of this event was recently celebrated at the 85th AAVSO Annual Meeting held in Cambridge, MA in 1996 (Journal of the AAVSO Volume 25, Number 2, 1997).
Pulsating red giants (apart from the Mira stars) have been much less studied than the Cepheids for instance, mostly because of their irregularity; it takes years or decades of observations to fully understand these stars.
The radii of red giants are not only difficult to measure, but they are also difficult to define, because of the tenuous nature of their atmospheres.
www.aavso.org /vstar/vsots/0701.shtml   (2366 words)

  
 Lives and Deaths of Stars
Betelgeuse, the bright red star in the top left corner of the Orion constellation, is an example of a supergiant star.
Red giants can have strong ``winds'' that dispel more mass than all of the stellar winds that occurred during the long main sequence stage.
A red giant has the extremes in temperature and density: its surface is cold and very low density, while its core gets very hot and extremely dense.
www.astronomynotes.com /evolutn/s5.htm   (1009 words)

  
 SPACE.com -- Red Giants and Planets To Live On
The "habitable zone" of a red giant (like the sun will be) extends from about 630 million miles to 2 billion miles.
Science fiction authors have long used red giant stars as a convenient location for alien civilizations; often, it is used to denote the planet of a very ancient and wise civilization.
The light from the great red sun low down on the horizon was quite ample for human eyes, but Jan wondered how long it would be before he yearned for greens and blues.
www.space.com /businesstechnology/technology/technovel_redgiant_050401.html   (517 words)

  
 Red Giant   (Site not responding. Last check: 2007-10-26)
Red Giant's music may slide back and forth between these various poles, but that 10-year-old quote still holds water.
One of its most interesting characteristics was The Giant's ability to create abrasive music in even the quietest passages, making the record surprisingly "difficult." There was no question, however, that the band pioneered some interesting territory, even if the disc's sound quality was rather distractingly constricted.
I preached the Red Giant gospel to any that would listen, and when the chance came to see them at SHOD 2 I jumped at it, even tracking down Alex for a copy of 'Psychoblaster' on tape during one of their notoriously fast load-outs.
www.redgiant.net /press.cfm?revID=2   (616 words)

  
 Red giant - Memory Alpha
A red giant is a very large, relatively cool star comprised mainly of ionized atoms.
The average temperatures of red giants are between 2500 and 3500 Kelvin.
The Xindi were building a massive weapon to destroy Earth in 2153 on one of their military outposts on Azati Prime that orbited a red giant star.
www.memory-alpha.org /en/wiki/Red_giant   (243 words)

  
 Dying Red Giant Stars may not get any Planet to life
An international team of astronomers estimates that the emergence of new life on a planet is possible within the red giant phase.
Lopez and his colleagues estimate that more than 150 red giant stars are close enough - within 100 light years - for upcoming or proposed missions to search for the signatures of life on distant worlds.
The NASA news source stated, "150 red giant stars are close enough - within 100 light years - for upcoming or proposed missions to search for the signatures of life on distant worlds" is doubtful, it is against laws of physics.
internationalreporter.com /news/read.php?id=552   (836 words)

  
 Coronal activity may be 'buried alive' in red giant stars, say Colorado researchers
When Earth's sun expands into a red giant star in roughly five billion years, long after Earth has become uninhabitable, the hydrogen core will be burned out and the bloated outer shell will be cool and murky.
But according to new research by the University of Colorado at Boulder, such red giants still retain surface magnetic storms and coronas -- the very hot and patchy outer atmosphere of the sun and sun-like stars -- at temperatures of millions of degrees Fahrenheit that often signal stellar youth.
The red giant coronal regions, however, appear to be submerged in the extended outer shell known as the chromosphere, "buried alive" in these red giants.
www.eurekalert.org /pub_releases/2003-01/uoca-cam010203.php   (621 words)

  
 StarChild: Stars
It is red because it is cooler than the protostar phase and it is a giant because the outer shell has expanded outward.
As a red giant, the hydrogen gas in the outer shell continues to burn as the temperature in the core continues to rise.
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.
starchild.gsfc.nasa.gov /docs/StarChild/universe_level2/stars.html   (824 words)

  
 Dan Durda's Space Art Gallery
A gas giant planet is stripped of its atmosphere, and its moons turned into mega-comets, as the local sun explodes.
A red giant and its white dwarf companion set over a mountain lake on an alien planet.
On the fringes of an open cluster, a red giant and its blue giant companion illuminate a flat-floored crater on an icy planet.
www.boulder.swri.edu /~durda/paintings.html   (799 words)

  
 red giant on Encyclopedia.com   (Site not responding. Last check: 2007-10-26)
RED GIANT [red giant] star that is relatively cool but very luminous because of its great size.
First quarter a giant problem as Wilson falls: The cold-starting Bulldogs fall into a 16-point hole after a quarter and can't come all the way back in a District 3-AAAA quarterfinal loss to Red Lion.
Giant Eagle, Heinz and the Browns Donate $25,000 to Cleveland Foodbank and $25,000 to Cleveland Browns Foundation; Browns scores in "Red Zone" add up to help for area needy and youths.
www.encyclopedia.com /html/r1/redgiant.asp   (1252 words)

  
 Universe Today - Stars Can Survive Being Engulfed
The white dwarf used to be a red giant star many times larger than our own Sun which blew up so large the Sun-like star was completely engulfed, but it actually survived the ordeal; it bears the unique signature of material that it accreted while it was inside the giant's envelope.
The carbon-poor material in the core of the red giant is mixed with outer part of the star, so its atmosphere will have a deficit of carbon, as compared with Sun-like stars, as shown in the figure.
If a red giant is part of binary system of closely orbiting stars, the evolution of the secondary star can be dramatically affected.
www.universetoday.com /am/publish/stars_survive_engulfed.html?3012004   (654 words)

  
 Planet Found Orbiting Red Giant :: Astrobiology Magazine ::
The giant planet in orbit around HD 47536 probably is starting to witness some dramatic events.
However, in the later phase of their lives, when the stars become giants, they slow down considerably and scientists then have a much better chance of detecting possible exoplanets in orbit around them.
With over 70 other giant stars still under close scrutiny, the ESO team is working hard to sift through the observational data.
www.astrobio.net /news/modules.php?op=modload&name=News&file=article&sid=361   (956 words)

  
 Zoom Astronomy Glossary: R
A red dwarf is a small, cool, very faint, main sequence star whose surface temperature is under about 4,000 K. Red dwarfs are the most common type of star.
A red supergiant is a relatively old star whose diameter is about 100 times bigger than it was originally, and had become cooler (the surface temperature is under 6,500 K).
The red shift is an increase in the wavelength of the light that is emitted from an object that is moving away from us.
www.enchantedlearning.com /subjects/astronomy/glossary/indexr.shtml   (2336 words)

  
 RED GIANT?
Of course there may be sections in a track where the rhythm stops, and in these situations the Federation 'free-wheels' at the last detected bpm until it picks up a new signal.
Red Sound have made some improvements to their beat-analysis software for the Federation, and compared to the Voyager 1 it has a better chance of reading bpm rates from more obscure audio sources with less well defined beat information.
Panning: Red Sound's new gimmick is their Spatial Panning System, which splits an incoming audio signal into low-, mid- and high-frequency bands, then pans the separated frequencies across the stereo field in different directions, in time with the signal's bpm rate.
www.soundonsound.com /sos/oct99/articles/redsound.htm   (2358 words)

  
 Red Panda - Giant Panda Bears , Picture (Red) Lesser Pandas
Some think the Giant Panda and the Red Panda are very close cousins and some hypothesize that they are from two distinctly separate evolutionary tree branches.
Like the Giant Panda Bear that everyone is familiar with, the Red Panda is also an internationally “Protected Species”.
The Red Panda, or Lesser Panda, (Ailurus fulgens) is on APPENDIX 2 of
www.tigerhomes.org /animal/red-panda.cfm   (471 words)

  
 Red Pandas at the Zoo - National Zoo| FONZ
Red pandas are engaging, raccoon-like, bamboo-eating animals that share parts of the same Asian habitats with giant pandas.
Although not "giant," the red panda is a species that also deserves scientific and conservation attention, as well as wider recognition among the public.
Red pandas have unique red coats and reddish-brown tear marks from the eyes to the corner of the mouth.
nationalzoo.si.edu /Animals/AsiaTrail/RedPanda/default.cfm   (197 words)

  
 red giant
As a star uses up its hydrogen by converting it to helium, its central core contracts while the outer layers expand and cool; this process produces the low temperature and large size (from 10 to 1,500 times that of the sun) that characterize the red giant.
Although most giant stars are red, some prominent giant stars are other colors near the red end of the spectrum, e.g.,
Birth and Death of a Star - Astronomers think that a star begins to form as a dense cloud of gas in the arms of spiral...
www.factmonster.com /ce6/sci/A0841337.html   (199 words)

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