How can a star with a surface temperature that is four times that of the Sun be just as luminous as the Sun?

Thus, if a star has a surface temperature 4 times higher than that of the Sun, but the same surface area, it emits 44= 256 times as much energy as the Sun, per second. It is256times as luminous as the Sun.

How much more luminous would a star be than the Sun if it had twice the surface area and was three times as hot?

How many times more luminous than the Sun would a star be if it had 3 times the Sun’s radius and twice the Sun’s temperature? If the radius of Star A is 3 time larger than the Sun, then its luminosity has to be (ratio of radius)2 = 32 = 9 times larger.

What type of star has a low temperature but a low luminosity?

What type of star has a low temperature and a low luminosity? red dwarf 11.

How does the temperature and luminosity of the Sun compare to that of the other stars on the main sequence?

Stars on the Main Sequence that are hotter than the Sun are also larger than the Sun. So hot blue stars are more luminous (and therefore appear higher in this diagram) for two reasons: they are hotter, and hot objects are more luminous than cool objects, but they are also larger.

What is the luminosity of a star having 6 times the radius of the sun and a surface temperature of 10000 K?

What is the luminosity of a star having 6 times the radius of the Sun and a surface temperature of 10000 K? In solar units, the radius-luminosity-temperature relationship is L = R2T4. Using the values provided, L = 6^2(10,000 / 5800)^4. L = 320 solar luminosities.

What happens if you double the temperature of a star?

This means that if you double the temperature of an star, it will radiate 2 x 2 x 2 x 2 = 16 times as much energy per square unit of area, and also in total if its surface area doesn’t change. This star has a radius (remember area is proportional to R2) which is 479 times larger than the Sun.

Which star is about 100000 times brighter than the Sun?

Betelgeuse is far away, yet it’s one of the brightest stars in Earth’s sky because it’s intrinsically very brilliant, some 100,000 times brighter than our own sun. Such brilliance comes at a price.

Which are more common stars more luminous than the Sun or stars less luminous than the Sun?

For instance, nearly every star that you see with the unaided eye is larger and more luminous than our sun. The vast majority of stars that we see at night with the eye alone are millions – even hundreds of millions – of times farther away than the sun.

Which star has the lowest luminosity?

White Dwarfs Finally, there are also few stars found below the Main Sequence in the lower left (high temperature and low luminosity) corner. The stars of this group are known as White Dwarfs, and they have low luminosities because their radii are in general quite small, about the same as the Earth’s radius.

What star has a higher luminosity and lower temperature?

Main sequence stars have a Morgan-Keenan luminosity class labelled V. red giant and supergiant stars (luminosity classes I through III) occupy the region above the main sequence. They have low surface temperatures and high luminosities which, according to the Stefan-Boltzmann law, means they also have large radii.

How does the sun’s luminosity compared to other stars?

In fact, the sun is thought to be more luminous than 85\% of the stars in our Milky Way galaxy. Yet most of these less luminous stars are too small and faint to see without an optical aid. Let’s presume a star has the same surface temperature as the sun, but sports a larger radius.

What is the relationship between luminosity and temperature for stars on the main sequence?

What is the relationship between luminosity and temperature for stars on the Main Sequence? The brighter it is, the hotter it becomes.

What is the difference between the Sun’s radius and luminosity?

Its radius is thought to be around 1400 times than of our sun, and its luminosity 270,000 greater than our sun. Also, if a star has the same radius as the sun but a higher surface temperature, the hotter star exceeds the sun in luminosity.

What determines the luminosity of stars with the same surface temperature?

Let’s presume a star has the same surface temperature as the sun, but sports a larger radius. In that scenario, the star with the larger radius claims the greater luminosity. In the example below, we’ll say the star’s radius is 4 solar (4 times the sun’s radius) but has the same surface temperature as our sun.

What is the radius of a star in solar radii?

These are not often given in numerical values, but this equation serves well when asked to find e.g the radius of a star, in solar radii given that a star is twice as luminous and has 5 times the temperature of that of the sun. So the star’s radius is almost 17.5 times that of the sun. Hopefully, you find this info useful!

How many times more luminous is a red giant than the Sun?

So the newly formed, red giant star is almost 16 times more luminous than the sun. This is owing to the increased surface area of the star due to the massively increased radius. There is an equation that might be useful for comparing the radii, temperature and luminosity of main sequence stars.