A red supergiant is the biggest type of star and one of the brightest. They're cooler, and therefore dimmer, than blue supergiants.
A red supergiant is a type of star.
The SS Tsiolkovsky spent six months, from late 2363 to 2364, monitoring the collapse of a red supergiant into a white dwarf. (TNG: "The Naked Now")
External linkEdit ...
red supergiant
a cool, massive star near the end of its life that has expanded to a size from a hundred to a thousand times the diameter of the sun
redshift ...
red supergiant An extremely luminous red star. Often found on the asymptotic giant branch of the H-R diagram.
Red Supergiant
A supergiant with spectral type M. Red supergiants are the largest stars in the universe: if put in place of the Sun, some would touch Saturn. The two brightest red supergiants in Earth's sky are Betelgeuse and Antares.
RED SUPERGIANT 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). They are frequently orange-red in color.
Red supergiants are extraordinary stars. "They are the final stage in the life of a giant star between eight and thirty solar masses," says Davies.
red supergiant An extremely luminous and large red star.
reddening Dimming of starlight by interstellar matter, which tends to scatter high-frequency (blue) components of the radiation more efficiently than the lower-frequency (red) components.
(a) A red supergiant star in the constellation Orion and the brightest red supergiant in Earth's sky. [C95]
(b) A red semiregular variable supergiant (M2 Iab) about 500 pc distant.
Orange-Red Supergiant (M2 Iab Spectral Class). 3300K surface temp.
How Far Away:
About 425 light years away ...
A typical red supergiant could be about 100 times larger than the red giant. Its surface temperature is low while the total luminosity remains high, with absolute magnitude up to -10 (comparing to 4.8 of our Sun).
Arcturus is a red supergiant star and the fourth brightest star in the whole sky.
Betelgeuse is a red supergiant, one of the physically largest stars known. If it were placed at the center of our solar system, its outer surface would possibly extend to the orbit of Mars.
Betelgeuse is a red supergiant of spectral type M1-2Ia-Iab. The luminosity of the star is about 10,000 times that of the sun.
There are three red supergiants in the constellation that are visible to the naked eye.
There are three red supergiants in the cluster, slated to go supernova in the next few million years. Also, near the center of the image are small, dense globules of gas and dust where new stars are being formed.
Betelgeuse is a red supergiant. The bright yellow spot at the bottom of the star is thought to be a hotspot due to a massive convection cell.
Betelgeuse is a red supergiant, one of the largest stars known. Image from the Hubble Space Telescope.
These are usually red supergiants. Semiregular variables may show a definite period on occasion, but also go through periods of irregular variation. The best known example of a semiregular variable is Betelgeuse, which varies from about magnitudes +0.
7 (ranking 11th in the sky), this class M (M1.5) red supergiant (with a temperature of about 3650 Kelvin) is a semi-regular variable that changes between magnitude 0.3 and 1.
The leading star alpha Her, called Ras Algethi (arab.: kneeler's head), is a red supergiant (spectraltype M5Ib-II). Its brightness varies erratically from 3.1 mag to 3.9 mag. A small telescope reveals a second star of 5.
They finish their main sequence lifetime in a way similar to the lower mass stars, but become brighter and cooler on the outside and are called red supergiants.
During these final stages the star expands to thousands of times the diameter of the Sun, becoming a red supergiant like Betelgeuse. Iron is the end of the exothermic fusion road: to fuse iron into heavier elements is an endothermic reaction.
So now these dying massive stars will be seen as either Red Supergiants or Blue Supergiants, depending upon how hot or cool they are. Due to their very large radius they also tend to be extremely luminous. How large can the radii get?
After the outer layers of the star have swollen into a red supergiant (i.e., a very big red giant), the core begins to yield to gravity and starts to shrink.
Alpha Orionis, commonly known as Betelgeuse is a red supergiant star marking the shoulder of the winter constellation Orion the Hunter.
Its normal life over, Betelgeuse is now a red supergiant - red, because its surface is a comparatively cool red-hot, and supergiant, because it is hundreds of times larger than the Sun and ten times more massive.
A red supergiant of spectral class M1, Antares has an apparent magnitude of about 0.9, making it one of the 20 brightest stars in the sky. Its name is from the Greek meaning "rival of Mars," referring both to its color and to its brightness.
A huge red supergiant, the size of the orbit of Jupiter. On the celestial equator. One of the 3 that make up the "Winter Triangle" (Sirius, Procyon, and Betelgeuse).
Instead, it's a star cluster toward the center of the Milky Way galaxy that contains at least 14 red supergiant stars, which are some of the largest and most massive stars in the galaxy.
It is thought that giant stars (those with a mass over 3 times the mass of the Sun) will evolve into a red supergiant, a supernova, and then into a black hole.
The brightest known stars in our galaxy are very luminous red supergiants. They have spectral types M0-8 Ia+ and absolute magnitudes of -9 to -10 (about 4,000,000 times as bright as the Sun).
They are too unstable to become red supergiants and may evolve into . The LBV stage may last on the order of 10,000 years. Helical jets have reportedly been discovered emanating from at least one star.
It is a massive red supergiant, another very old star that will soon explode into a supernova. Betelgeuse marks the right shoulder of Orion and is approximately 640 light-years distant.
A highly evolved, orange-red giant star, Edasich is
still much smaller than the red supergiant Betelgeuse,
at left. (See a Digitized Sky Survey image of Edasich
at John Whatmough's web site, "Extrasolar Visions.") ...
The brightest of its rather dim stars is Ras Algethi (alpha Her), a variable red supergiant. The four stars of the central trapezoid within Hercules, epsilon Her, zeta Her, eta Her, and pi Her, form the called Keystone.
Antares is a red supergiant and an irregular variable. Its name means "rival of Mars" (Ares and Mars being, respectively, the Greek and Roman gods of war), a reference to its similar appearance to the Red Planet.
This red supergiant has a visual binary that just might be visible, depending on local conditions and the size of one's scope (see below). The star is estimated to be between 285 sun diameters to about 700 suns. It's 600 light years away.
Among its red supergiants is a semiregular long-period variable Z Sagittae (13.5 - 15.7 mag.). To find M71, point your binoculars or a telescope halfway between g Sagittae and d Sagittae (see finder chart below).
lands on "Horizontal Branch" (HB)
He fuel exhausted in core
He & H shells burning, very powerful
envelope expands and cools ---
up RGB second time (AGB)
red supergiant (Rstar ~ 5 AU, L star ~ 10 4 Lsun ) ...
Some (super)giants are blue, like Rigel, but most are found on the far right of the H-R diagram and are red (M-type) or orange (K-type). Betelgeuse is a red supergiant while Aldebaran and Pollux are red-orange giants (not super at all) pretty close ...
Small Magellanic Cloud spanning a distance of 65 light years across and located 200,000 light years in distance from the Blue Planet in the Constellation Tucana. Both open clusters consist of mainly young, hot white stars along with red supergiants, ...
It is believed that the relative faintness of 1987A was due to its progenitor star being a smaller blue supergiant instead of a red supergiant. After the peak, the supernova slowly grows fainter as the shell cools.
the photo-correlation interferometric method suitable for measuring the diameters of such stars. Since the late 1960s investigators have relied on another procedure, known as speckle interferometry, to reproduce the true disks of red supergiants.
The Greeks did not give a name to either Betelgeuse or Rigel, surprisingly for such prominent stars, which is why we know them by their Arabic titles. Betelgeuse is a red supergiant star hundreds of times the diameter of the Sun.
Then the luminosity of several things are calibrated: (a) the supernova type 1a maximum luminosity in any type of galaxy; (b) the globular cluster luminosity function in elliptical galaxies; (c) the blue or red supergiant stars relation in spirals ...
Mira variables (NASA Thesaurus) Long-period (80 to over 600 days) variable stars of red giant or red supergiant type, exemplified by the star Mira Ceti. Used for long period variables. mirage (NASA SP-7, 1965) 1.
 See also: Supergiant, Giant, Star, Light, Sun
|
