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That isn't know with certainty. You can see a list in Wikipedia, if you search for "List of most luminous stars"; the article describes some of the caveats, for example, the distance to the stars are not always known with great precision. Also, this obviously only includes known stars, which are relatively close to us (mainly in our own galaxy).
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Does apparent magnitude refer to real luminosity?
No. Apparent magnitude (or luminosity) means how bright a star (or other object) looks to us; absolute magnitude (or luminosity) refers to how bright it really is.
What would be the absolute magnitude and color of a main sequence star with a luminosity of 100?
Absolute magnitude = -0.5Colour would depend on it's temperature.
How do astronomers measure stellar luminosity?
The reference that astronomers use to compare the luminosity of other stars is the sun's luminosity. The luminosity is denoted in multiples of the sun's luminosity. For example, the luminosity of the star Sirius is 25 times the luminosity of the sun.
What is a large star of high luminosity?
A good example of a medium size star is the Sun, which is very average. Luminosity is measured by the star's absolute magnitude, which is the magnitude seen from a standard distance of ten parsecs (32.6 light-years), and the Sun's absolute magnitude is +4.7. A factor of 100 increase in luminosity corresponds to 5 magnitudes less (larger magnitudes mean dimmer stars). The brightest stars have absolute magnitudes around -7.
Is sun the brightest star?
The brightness of a star is usually referred to as its magnitude. Every star has two magnitudes. The apparent magnitude is how bright it appears to us here on earth. The absolute magnitude is the apparent magnitude that the star would have, if it were viewed from a standard distance. The apparent magnitude of our sun is vastly greater than that of any other celestial object. In terms of absolute magnitude, our sun can't begin to compare with some of the big bright stars in the universe.
Does apparent magnitude refer to real luminosity?
No. Apparent magnitude (or luminosity) means how bright a star (or other object) looks to us; absolute magnitude (or luminosity) refers to how bright it really is.
Explain why size is the only factor that determines the stars absolute magnitude?
The absolute magnitude is a measure of the star's luminosity hence the smaller the size the less the absolute magnitude.
What would be the absolute magnitude and color of a main sequence star with a luminosity of 100?
Absolute magnitude = -0.5Colour would depend on it's temperature.
What is the absolute and apparent magnitude of a giant star?
Magnitudes require distance and luminosity. Therefore a specific star is required.
Which star is giving off more light?
Those with a higher luminosity or a greater absolute magnitude.
What does the HR diagram depict?
the relationship between a star's luminosity, temperature, absolute magnitude, and spectral type.
What is the absolute magnitude of this star m equals 6?
Magnitude = m - 5 (log10D) - 1) Where D is the star's luminosity distance in parsecs ----------------------------------------------------------------- In order to calculate a star's absolute magnitude, we need two pieces of information: -- its apparent magnitude, i.e., how bright it appears from Earth, and -- its distance from us.
What is the magnitude of a star as it appears in the sky called?
The Polar star is the star that is magnitude. This is a Luminosity star.
Which star has the greatest magnitude in Aquarius?
Beta Aquarii (Sadalsuud) has an apparent magnitude of 2.89 and an absolute magnitude of -4.5.
How do size temperature and distance affect a star's magnitude or luminousity?
A star's real luminosity is proportional to the the square of its diameter, and more or less proportional to the fourth power of its absolute temperature. The star's apparent luminosity is proportional to its real luminosity. It is also inversely proportional to the square of the distance.
How do astronomers measure stellar luminosity?
The reference that astronomers use to compare the luminosity of other stars is the sun's luminosity. The luminosity is denoted in multiples of the sun's luminosity. For example, the luminosity of the star Sirius is 25 times the luminosity of the sun.
The measure of a stars brightness is called its what?
Scientists actually use two measurements to identify a star's brightness. One is luminosity, or the energy that star puts out. Another is magnitude, or the amount of light a star puts out.
