A blue supergiant (BSG) is a hot, luminous star, often referred to as an OB supergiant.They have luminosity class I and spectral class B9 or earlier.. Blue supergiants are found towards the top left of the Hertzsprung–Russell diagram, above and to the right of the main sequence.They are larger than the Sun but smaller than a red supergiant, with surface temperatures of 10,000–50,000 K … Lower mass blue supergiants continue to expand until they become red supergiants. 16" (400m) telescope = 16 4" (100mm) telescope = 12.5 The dividing line is approximately 40 M☉, although the coolest and largest red supergiants develop from stars with initial masses of 15–25 M☉. They are larger than giant stars, and less luminous than hypergiants. It is much easier to see color in stars than in diffuse objects like nebulae. Blue supergiants are supergiant stars (class I) of spectral type O. Some examples of supergiant stars are Rigel, Deneb and Betelgeuse. One of the largest stars ever discovered is the red supergiant VY Canis Majoris. 12" (300m) telescope = 15 These are the brightest blue giant, supergiant, and hypergiant stars that can be found by eye, binoculars, or small (4-inch) telescope. Expansion into the supergiant stage occurs when hydrogen in the core of the star is depleted and hydrogen shell burning starts, but it may also be caused as heavy elements are dredged up to the surface by convection and mass loss due to radiation pressure … Hubble space telescope = 30 [4][5] Depending on the exact mass and composition of a red supergiant, it can execute a number of blue loops before either exploding as a type II supernova or finally dumping enough of its outer layers to become a blue supergiant again, less luminous than the first time but more unstable. also known as 藍超巨星; Printed dictionaries and other books with definitions for Blue supergiant Some great examples of blue supergiant stars are UW Canis Majoris, Rigel, and Tau Canis Majoris. Some are only 50 million kilometers across, small enough to fit inside the orbit of Venus. They are larger than the Sun but smaller than a red supergiant, with surface temperatures of 10,000–50,000 K and luminosities from about 10,000 to a million times that of the Sun. the examples are Mu Cephei or Garnet Sidus. Quickly rotating supergiants can be highly mixed and show high proportions of helium and even heavier elements while still burning hydrogen at the core; these stars show spectra very similar to a Wolf Rayet star. Read Example Of Blue Supergiant Stars Essays and other exceptional papers on every subject and topic college can throw at you. Those live relatively short stellar lives and die explosive deaths after only a few tens of millions of years. [6] If such a star can pass through the yellow evolutionary void it is expected that it becomes one of the lower luminosity LBVs. In the process they must spend some time as yellow supergiants or yellow hypergiants, but this expansion occurs in just a few thousand years and so these stars are rare. We can custom-write anything as well! Blue Supergiant Blue supergiant stars are in between the size of red giants and blue hypergiants. Binoculars = 10 [2], Supernova progenitors are most commonly red supergiants and it was believed that only red supergiants could explode as supernovae. Part of the nebula NGC 6357, located in the Pismis 24 open cluster, is a variable blue supergiant. Some live long and prosper while others are born on the fast track. The example pictured above is a supergiant 500 times the diameter of the Sun and about 12 times as massive. Main sequence stars are powered by the fusion of hydrogen (H) into helium (He) in their cores, a process that requires temperatures of more than 10 million Kelvin. A famous examples of a bright blue giant star is Spica, a binary system whose primary component is a blue giant, and together with its companion, make up the 4 brightest star in the constellation Virgo. Blue Supergiant Stars: Behemoths of the Galaxies. Blue giant is not a strictly defined term and it is applied to a wide variety of different types of stars. However, others consider any star with a radius … Blue Giant, Supergiant & Hypergiant Stars. [10][11][12], Because of their extreme masses they have relatively short lifespans and are mainly observed in young cosmic structures such as open clusters, the arms of spiral galaxies, and in irregular galaxies. Blue supergiants are among that second group. SN 1987A, however, forced astronomers to re-examine this theory, as its progenitor, Sanduleak -69° 202, was a B3 blue supergiant. [9] While most supernovae are of the relatively homogeneous type II-P and are produced by red supergiants, blue supergiants are observed to produce supernovae with a wide range of luminosities, durations, and spectral types, sometimes sub-luminous like SN 1987A, sometimes super-luminous such as many type IIn supernovae. ESO/IDA/Danish 1.5/ R. … Main sequence stars typically range from between one tenth to 200 times the Sun’s mass. Some are 2,700 million … There are a great number of supergiant stars. An example of a blue/white giant star is Alcyone in the constellation Taurus. They have luminosity class I and spectral class B9 or earlier.[1]. When a red supergiant becomes a blue supergiant, the faster wind it produces impacts the already emitted slow wind and causes the outflowing material to condense into a thin shell. A blue supergiant (BSG) is a hot, luminous star, often referred to as an OB supergiant. [7], The most massive blue supergiants are too luminous to retain an extensive atmosphere and they never expand into a red supergiant. Massive, luminous O and B class stars are sometimes classed as blue-white supergiants, such as Rigel, a B class star with a radius 70 times that of the Sun, 17-times the Sun's mass and 66 000 times the Sun's luminosity. Jump to : navigation, search. Supergiants are some of the largest stars in the universe. [3], Blue supergiants are newly evolved from the main sequence, have extremely high luminosities, high mass loss rates, and are generally unstable. These will eventually become red supergiants over time. En savoir plus. They are very luminous and very hot. Naked-eye = 6* (dark sky) • MACS J1149 Lensed Star 1 (or Icarus) – most distant individual star detected Naked-eye = 5 (suburbs) Alpha Cygni ist gerade auf dem Weg, sich von einem blauen Stern zu einem Roten Überriesen zu verwandeln und erstrahlt in weiß, d.h. alle Farben des Spektrums sind in etwa gleich stark … Supergiants are evolved high-mass stars, larger and more luminous than main-sequence stars. Red Supergiant . Blue Supergiant Stars Essay Example Blue supergiant stars are staller evolutions that have resulted over millions of years. They become blue supers through radiation pressure, convection and the large burning of hydrogen. They vary greatly in size. They are rarely observed in spiral galaxy cores, elliptical galaxies, or globular clusters, most of which are believed to be composed of older stars, although the core of the Milky Way has recently been found to be home to several massive open clusters and associated young hot stars.[13]. Rigel (β Orionis),a blue-white (B-type) supergiant. They are larger than giant stars, and less luminous than hypergiants. Except for the brightest magnitude objects, most will appear white/gray because they are too dim to activate the cone (color-sensing) cells in our eyes. Supergiants are some of the largest stars in the universe. Did you know? During the main sequence stage, the star converts hydrogen to helium by nuclear fusion in the cores of stars the process also known as proton-proton chain. They are scattered across the night sky. 8" (200mm) telescope = 14 It has around 315 solar masses and 8.7 million solar luminosity. Direct image of the star UY Scuti, a red supergiant which is one of the largest known stars. A blue - white supergiant and one of the luminous stars known it is nearly light - years away : 5. In either case the nearby dust is heated by the central object and reradiates the absorbed energy at mid- and far infrared wavelengths. Rigel—a blue supergiant. In the early-1840s, a major outburst saw Eta Carinae brighten from its usual position on the borders of naked-eye visibility, to become the second-brightest star in the sky. Higher mass red supergiants blow away their outer atmospheres and evolve back to blue supergiants, and possibly onwards to Wolf–Rayet stars. They tend to be situated towards the top of the Hertzsprung-Russel Diagram, … 29 Canis Majoris (29 CMa),a blue-white (O-type) supergiant. Perhaps the most famous example is Eta Carinae, a double-star system containing a blue LBV of around 100 solar masses, orbited by a blue supergiant of about 30 solar masses. * up to 8 with perfect eyes under ideal skies. The most massive and luminous star ever discovered is a Wolf-Rayet star named R136a1. Blue giants are much rarer than red giants, because they only develop from more massive and less common stars, and because they have short lives. supergiant définition, signification, ce qu'est supergiant: 1. an extremely large star that is between 10,000 and 100,000 times brighter than the sun 2. an…. What they have in common is: a moderate increase in size and luminosity compared to main-sequence stars of the same mass or temperature, and are hot enough to be called blue, meaning spectral class O, B, and sometimes early A. Blue supergiants have fast stellar winds and the most luminous, called hypergiants, have spectra dominated by emission lines that indicate strong continuum driven mass loss. If you want to see more color, use an astrophotograpy camera. For example… Many of them become luminous blue variables (LBVs) with episodes of extreme mass loss. Star, Magnitude (m) Type; Constellation, Season; α Camelopardalis (4.3) supergiant ; Camelopardalis (Winter) τ Canis Majoris (4.4) supergiant ; Canis Major (Winter) UW CMa (4.8-5.3) supergiant ; Canis … Part of a cluster of three nearby objects, 24-1A represents the most massive and most luminous of the group, with a mass between 100 and 120 solar masses. Despite their rarity and their short lives they are heavily represented among the stars visible to the naked eye; their immense brightness is more than enough to compensate for their scarcity. They may "bounce" backwards and forwards executing one or more "blue loops", still at a fairly steady luminosity, until they explode as a super… They are extremely hot and bright, with surface temperatures of between 20,000 - … These stars usually become blue supergiants, although it is possible that some of them evolve directly to Wolf–Rayet stars. Zeta … It is not clear whether more massive blue supergiants can lose enough mass to evolve safely into old age as a Wolf Rayet star and finally a white dwarf, or they reach the Wolf Rayet stage and explode as supernovae, or they explode as supernovae while blue supergiants. Basking in the glow of the bright supergiant star Rigel the Witch Head Nebula trails like a puff of smoke through the Eridanus constellation about light years away: 7. Explanation. While the stellar wind from a red supergiant is dense and slow, the wind from a blue supergiant is fast but sparse. Same reason you can see color in daylight and black/white at night. In … They cool and enlarge at approximately constant luminosity to become a red supergiant, then contract and increase in temperature as the outer layers are blown away. It is more than 1,000 times bigger than our Sun. Supergiant. Moreover, Spica was the star whose movement across the sky had led the ancient astronomer Hipparchus to discover the precession of the equinoxes. 1. These stars usually become blue supergiants, although it is possible that some of them evolve directly to Wolf–Rayet stars. Blue supergiants are found towards the top left of the Hertzsprung–Russell diagram, above and to the right of the main sequence. Their spectra has neutral helium, which are most prominent at class B. Its mass is about 20 times that of the Sun, and its luminosity is around 117,000 times greater. Blue supergiants show varying quantities of heavy elements in their spectra, depending on their age and the efficiency with which the products of nucleosynthesis in the core are convected up to the surface. 10. of 10. Naked-eye = 4 (city) It is around 14 billion light-years away from us. Supergiant stars are some of the brightest in the night sky, thanks to their intense luminosities. A red supergiant Betelgeuse is no slouch of a star either: 6. Therefore blue giant simply refers to stars in a particular region of the HR diagram rather than a specific type of star. Allemand . Rigel, the brightest star in the constellation Orion is a typical blue-white supergiant; Deneb is the brightest star in Cygnus, a white supergiant; Delta Cephei is the famous prototype Cepheid variable, a yellow supergiant; and Betelgeuse, Antares and UY Scuti are red supergiants. Rigel—a blue supergiant. There are many different types of stars that astronomers study. Examples of blue supergiant stars. Pismis 24-1 B . Around 90 percent of the stars in the Universe are main sequence stars, including our sun. In some cases several concentric faint shells can be seen from successive episodes of mass loss, either previous blue loops from the red supergiant stage, or eruptions such as LBV outbursts. One of the closest is the red supergiant Betelgeuse, the red star at the shoulder of Orion the Hunter. Stars during the main sequence phase spend a majority of their lives. supergiant definition: 1. an extremely large star that is between 10,000 and 100,000 times brighter than the sun 2. an…. Learn more. Here too, what appears to be a blue supergiant is actually a multistar system. One of the most distant stars detected is a blue supergiant named Icarus. KidzSearch Safe Wikipedia for Kids. Examples of embedded objects are clusters of newly formed stars in star formation regions, more evolved giant and supergiant stars such as infrared (OH/IR) stars or the central stars and perhaps central black hole of a galaxy. VX Sagittarii, one of the Supergiant star. O class and early B class stars with initial masses around 10–300 M☉ evolve away from the main sequence in just a few million years as their hydrogen is consumed and heavy elements start to appear near the surface of the star. The star cluster Pismis 24 also contains the star Pismis 24-1b. Alpha Cygni is on its way to evolve from a blue star to a red supergiant and therefore glows in white, which means all colors of the spektrum have nearly the same strength. They vary greatly in size. Class B stars are amongst the blue giant and small and middle sized supergiant stars. [14], "Yellow Hypergiants as Dynamically Unstable Post–Red Supergiant Stars", "A Massive Hypergiant Star as the Progenitor of the Supernova SN 2005gl", "Hubble Space Telescope/NICMOS Observations of Massive Stellar Clusters near the Galactic Center", Timeline of white dwarfs, neutron stars, and supernovae, Monte Agliale Supernovae and Asteroid Survey, https://en.wikipedia.org/w/index.php?title=Blue_supergiant_star&oldid=1004362879, Creative Commons Attribution-ShareAlike License, This page was last edited on 2 February 2021, at 06:55. These stars have a lifetime of a few hundred to a few million years and if they have mass high enough, they can explode in a stro… Red supergiants are a size in between red hypergaints and blue hypergiants. Blue supergiant: Blue supergiants are hot luminous stars, referred to scientifically as OB supergiants.They have luminosity class I and spectral class B9 or earlier. These are the brightest blue giant, supergiant, and hypergiant stars that can be found by eye, binoculars, or small (4-inch) telescope. Stars with an initial mass above about 25 M☉ quickly move away from the main sequence and increase somewhat in luminosity to become blue supergiants. [2] Expansion into the supergiant stage occurs when hydrogen in the core of the star is depleted and hydrogen shell burning starts, but it may also be caused as heavy elements are dredged up to the surface by convection and mass loss due to radiation pressure increase. The best known example is Rigel, the brightest star in the constellation of Orion. [8] Now it is known from observation that almost any class of evolved high-mass star, including blue and yellow supergiants, can explode as a supernova although theory still struggles to explain how in detail.
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