Whereas flux is the energy received over a unit area, luminosity is the total energy output of the star. One of the closest stars to Earth, Alpha Centauri A, is about 1.3 times as luminous as the sun. Luminosity is a measure of the energy radiated by an object, for example a star or a galaxy. A star which has a luminosity of 2L ⊙ is twice as luminous as our Sun, and a star of 0.5L ⊙ is half as luminous. Accurate measurement of stellar luminosities is quite difficult in practice, even when the apparent magnitude is measured accurately, for three reasons: The distance d to the star must be known, to convert apparent to absolute magnitude. It is also the most luminous … The Pistol Star, also known as V4647 Sagittarii, is a blue hypergiant star located about 25,000 light years from Earth in the constellation Sagittarius. B stars (Blueish white) luminosity 25 -> 30,000 and A stars (White) having a luminosity of 5 --> 25.
It may also interest the reader to know that The Sun is more luminous than approximately 95% of all known stars in the local neighborhood (out to, say, a few hundred light years), due to enormous numbers of somewhat less massive stars that are cooler and often much less luminous. List of most luminous stars. If this object were 10 parsecs away it would appear nearly as bright in the sky as our sun (apparent magnitude −26.74).
The last stars in the list are familiar nearby stars put there for comparison, and not among the most luminous known. It is a candidate luminous blue variable (cLBV) and one of the most luminous stars known, with a luminosity 1,600,000 times that of the Sun. Asked in Astronomy , Planetary Science , Stars It's more than 265 times the mass of our Sun, more than double most stars on this list. The star R136a1 currently holds the record as the most massive star known to exist in the universe.
The most luminous stars are Blue. Hertzsprung-Russel (HR) diagram. Since the Main Sequence is also a sequence in luminosity—that is, O stars are the most luminous, then B, then A, F, G, K, and M stars are the least luminous—there must be a relationship between mass and luminosity.
On the other hand, cooler stars emit less energy - …
On the Main Sequence, the more massive stars are bigger, hotter, more luminous, and die faster. Note that even the most luminous stars are much less luminous than the more luminous persistent extragalactic objects, such as quasars.For example, 3C 273 has an average apparent magnitude of 12.8 (when observing with a telescope), but an absolute magnitude of −26.7. O stars are the most massive, then B stars, then A, F, G, K, and M stars are the least massive. Below is a list of stars arranged in order of decreasing luminosity (increasing bolometric magnitude). The last stars in the list are familiar nearby stars put there for comparison, and not among the most luminous known. A few stars in … When stars are plotted on a luminosity vs surface temperature diagram (), several interesting patterns emerge:Most stars fall on the Main Sequence. Accurate measurement of stellar luminosities is quite difficult in practice, even when the apparent magnitude is measured accurately, for four reasons: The last stars in the list are familiar nearby stars put there for comparison, and not among the most luminous known. We can summarize this relationship by saying that hotter stars are more luminous than cooler ones. This list of most luminous stars is of Milky Way and Magellanic Cloud objects. A number of stars, however, lie above the main sequence on the H–R diagram, in the upper-right region, where stars have low temperature and high luminosity. Luminosity. It represents a relationship between temperature and luminosity that is followed by most stars. Astronomers are still trying to understand how the star can even exist. Below is a list of stars arranged in order of decreasing luminosity (increasing bolometric magnitude). For the stars of the main sequence, luminosity is directly related to their temperature - the hotter a star is, the more luminous it is.