They have temperatures from around 10,000 K upwards, zero age main sequence (ZAMS) masses greater than about twice the Sun (M☉), and absolute magnitudes around 0 or brighter. Massive stars also continue to expand as hydrogen shell burning progresses, but they do so at approximately constant luminosity and move horizontally across the HR diagram. Blue supergiants are supergiant stars (class I) of spectral type O.
In these cases they are called blue subdwarf (sdB) stars rather than blue giants, named for their position to the left of the main sequence on the HR diagram rather than for their increased luminosity and temperature compared to when they were themselves main-sequence stars. No blue giant remains a blue giant; it eventually will turn into a red giant.
Understanding the difference can deepen your appreciation of astronomy.
BHB stars are more evolved and have helium burning cores, although they still have an extensive hydrogen envelope. Stars form out of galactic dusts of hydrogen and helium. However, Sirius A is much too small to die as a supernova. And following the star Spica 10 interesting facts: 1. They are extremely hot and bright, with surface temperatures of between 20,000 - 50,000 degrees Celsius. 3. These giant stars are huge and bright.
This type of star is based on the actual star called. They have luminosity class I and spectral class B9 or earlier. It reveals that stars spend the vast majority of their lives in a period defined as "being on the main sequence". Blue-giants are considered as the largest stars in the galaxy since there is no such thing as Red or yellow super-giants in the Spore galaxy. The most massive ones could make 100 Suns (or more!). Depending on mass and chemical composition these stars gradually move blue wards until they exhaust the helium in their cores and then they return redwards to the asymptotic giant branch (AGB). Blue supergiants are among that second group.  The BHB takes its name from the prominent horizontal grouping of stars seen on colour-magnitude diagrams for older clusters, where core helium burning stars of the same age are found at a variety of temperatures with roughly the same luminosity. It has a mass of around 20 times that of the Sun and gives out more light than 60,000 suns added together. Helium is heavier than hydrogen, and burning it causes the star to expand greatly in size and become a red giant. Verti-Lift manufactures a complete line of scissor … Moreover, Spica was the star whose movement across the sky had led the ancient astronomer Hipparchus to discover th… From Star to White Dwarf: the Saga of a Sun-like Star.
Spica is 250 light years from Earth in the Virgo constellation. A Type II supernova event can occur during the red supergiant phase of evolution, but, it can qalso happen when a star evolves to become a blue supergiant. Constellation, Season. In this way they can quickly pass through blue giant, bright blue giant, blue supergiant, and yellow supergiant classes, until they become red supergiants. This causes the outer lays of the star to expand outward due to the increased heat generated in the core. However, at the blue end of the horizontal branch, it forms a "blue tail" of stars with lower luminosity, and occasionally a "blue hook" of even hotter stars.. In the standard Hertzsprung–Russell diagram, these stars lie above and to the right of the main sequence . Blue supergiants are supergiant stars (class I) of spectral type O. Blue Supergiant Stars: Behemoths of the Galaxies The very massive star R136a1 lies in this star-forming region in the Large Magellanic Cloud (a neighbor galaxy to the Milky Way). A blue giant star can put out 10,000 times as much energy as the Sun.
A good example is Plaskett's star, a close binary consisting of two O type giants both over 50 M☉, temperatures over 30,000 K, and more than 100,000 times the luminosity of the Sun (L☉). The name blue dwarf has been coined although that name could easily be confusing. The RR Lyrae variable stars, usually with spectral types of A, lie across the middle of the horizontal branch. Most planets orbiting these stars have blue spice and are among the rarest stars in the Galaxy, though they are still quite common compared to binary stars.
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