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SN 1987A, however, forced astronomers to re-examine this theory, as its progenitor, Sanduleak -69° 202, was a B3 blue supergiant. [18] 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. [19]
The state motto and seal have been official since Virginia declared its independence from the Kingdom of Great Britain. Virginia is one of only two states (the other being Mississippi with the Magnolia) to have the same plant for state flower and state tree, the Flowering Dogwood. [1] Most of the symbols were made official in the late 20th century.
These stars also evolve through the core helium burning stage at constant luminosity, first increasing in temperature then decreasing again as they move toward the AGB. 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. [7]
The Keenan criterion is the one most commonly used by scientists today; [1] hence it is possible for a supergiant star to have a higher luminosity than a hypergiant of the same spectral class. Hypergiants are expected to have a characteristic broadening and red-shifting of their spectral lines, producing a distinctive spectral shape known as a ...
M33-013406.63, also known as B416 or UIT301, [4] is a O-type blue evolved supergiant star in the constellation of Triangulum.It is located within the Triangulum Galaxy, which is approximately 2,380,000–3,070,000 light years away from Earth.
Rare blue supergiant stars are some of the hottest, brightest stars in the universe. But other distant supernovas have shown that before they exploded, stars ejected dense clouds decades beforehand.
List of the largest known stars in the Milky Way Star name Solar radius (R ☉) Method [a] Notes Orbit of Saturn: 2,047 – 2,049.9 [10] [b] Reported for reference: Theoretical limit of star size (Milky Way) ≳1,700 [11] L/T eff: Estimated by measuring the fraction of red supergiants at higher luminosities in a large sample of supernova ...
Some of the brightest stars in the night sky, such as Rigel and Antares, are in the list. While supergiants are typically defined as stars with luminosity classes Ia, Iab or Ib, other definitions exist, such as those based on stellar evolution. [1] Therefore, stars with other luminosity classes can sometimes be considered supergiants.