Which type of star has a low temperature and a low luminosity?

Which type of star has a low temperature and a low luminosity?

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

Which star group has the lowest temperature?

Type O stars have the highest surface temperatures and can be as hot as 30,000 Kelvins. On the other extreme, type M stars have the lowest surface temperatures and can be as cool as 3,000 K.

What is the absolute magnitude of a white dwarf?

The faintest known white dwarfs have Mv ~ 16.2. Age estimates for these stars are in the range 6.5-11 Gyr, with the variation largely due to uncertainty in the core composition.

Do hot stars have low temperature?

VI. A Hot Stars. Hot stars, meaning those having surface temperatures in excess of 10,000 K (vs ∼5800 K for our sun), emit much or most of their radiation in the UV wavelength range below 300 nm, the limit for ground-based observations.

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

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.

Why do white dwarf stars have low luminosity?

White dwarfs have an extremely small surface area to radiate this heat from, so they cool gradually, remaining hot for a long time. As a white dwarf cools, its surface temperature decreases, the radiation which it emits reddens, and its luminosity decreases.

What kind of stars have a low luminosity?

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.

Is the luminosity of a StAR related to its radius?

Since we have calculated the luminosity, we can calculate the absolute magnitude with this formula: It makes sense that if a star has more mass, it will have a bigger radius. In fact, here are the equations for calculating a star’s radius based on its mass. Where radius and mass are based on the Sun = 1.

Which is the hottest type of a star?

Often this value is expressed as the luminosity of the star. Spectral types are a measure of the surface temperatures of stars and are letter designations: O, B, A, F, G, K, and M. Type O stars have the highest surface temperatures and can be as hot as 30,000 Kelvins.

Are there any stars below the main sequence?

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.   Stars