What color stars have the highest luminosity?

blue
Hot blue stars, over 30,000 Kelvin, at left; and cool red stars, less than 3,000 Kelvin, at right. The most luminous stars – over 1,000,000 solar – are at top, and the least luminous stars – 1/10,000 solar – at bottom.

What is the luminosity of a star?

The apparent brightness, or apparent magnitude, depends on the location of the observer. Another measure of brightness is luminosity, which is the power of a star — the amount of energy (light) that a star emits from its surface. It is usually expressed in watts and measured in terms of the luminosity of the sun.

How does color affect luminosity?

A less well-known but equally important contextual phenomenon is that the colour of a stimulus can also alter its brightness. Specifically, stimuli that are more saturated (i.e. purer in colour) appear brighter than stimuli that are less saturated at the same luminance.

What are the colors of stars?

Black
Silver
San Antonio Stars/Colors

What star has the highest luminosity?

The brightest star in the sky is Sirius, also known as the “Dog Star” or, more officially, Alpha Canis Majoris, for its position in the constellation Canis Major. Sirius is a binary star dominated by a luminous main sequence star, Sirius A, with an apparent magnitude of -1.46.

What is the formula for determining the luminosity of a star?

The formula for stellar luminosity can be derived directly from the Stefan-Boltzmann law. This law states that for a black body, the energy radiated per unit time is equal to P = σ * A * T⁴

How do astronomers determine stars luminosity?

Astronomers determine a star’s luminosity by looking at its size and its effective temperature. The effective temperature is expressed in degrees Kelvin, so the Sun is 5777 kelvins. A quasar (a distant, hyper-energetic object in the center of a massive galaxy) could be as much as 10 trillion degrees Kelvin.

Which two stars have the same luminosity?

If two stars have the same surface temperature and size, then they both have the same luminosity. The reason is that there are only two effects determining luminosity, temperature and size, both of which are identical in this example.