Question: What Is The General Relationship Between Temp And Star Brightness?

What is the relationship between star size and temperature?

The amount of power that a star produces in light is related to the temperature of its surface and the area of the star.

The hotter a surface is, the more light it produces.

The bigger a star is, the more surface it has..

What is the life expectancy of a very dim star?

The life expectancy of a very bright star is 104 years. 18. The life expectancy of a very dim star is 1011 years.

Why is a star brightest at its coolest?

In a star like the sun it takes photons a million or more years to escape from their star. As fusion reaches it’s end the star expands and cools , this allows many more photons escape . Space is awash with these photons and the star is very bright because of it.

Which stars last the longest?

red dwarfsGenerally, the bigger a star is, the faster it uses up its supply of nuclear fuel, so the longest-lived stars are among the smallest. The stars with the longest lifetimes are red dwarfs; some may be nearly as old as the universe itself.

Which type of star is the hottest?

The spectral sequence of stars runs OBAFGKM.O stars are the hottest, with temperatures from about 20,000K up to more than 100,000K. … B stars have temperatures between about 10,000 and 20,000K. … A stars have strong absorption lines of Hydrogen. … F stars are slightly hotter than the Sun.More items…

Does star size affect temperature?

Luminosity increases with size for objects of the same temperature. Star s has a greater surface temperature compared with star x, but they both have the same luminosity. Therefore, star x is larger. For stars of the same luminosity, size decreases as temperature increases.

Is there a relationship between a star’s temperature and it’s true brightness?

A star’s brightness, or luminosity, depends on the star’s surface temperature and size. If two stars have the same surface temperature, the larger star will be more luminous. The Hertzsprung-Russell (H-R) diagram below is a scatter plot that shows the relative temperatures and luminosities of various stars.

What is the general relationship between temperature and star color?

The amount of light produced at each wavelength depends on the temperature of the object producing the light. Stars hotter than the Sun (over 6,000 degrees C) put out most of their light in the blue and ultraviolet regions of the spectrum.

Are hotter stars brighter?

The Luminosity of a Star A hotter star is more luminous than a cooler one of the same radius. A bigger star is more luminous than a smaller one of the same temperature.

How is temperature of a star determined?

(1) A star’s surface temperature can be determined from its spectrum. … The temperature of a star’s photosphere can also be deduced from its color. Cool stars (such as Betelgeuse, which has a surface temperature of T = 3500 Kelvin) emit more red and orange light than blue and violet light. Thus, cool stars are red.

How could you describe the brightness and temperature of main sequence stars?

Describe the general trend between temperature and luminosity that the Main Sequence shows. A hotter star should be brighter than a cooler star. … Although they are cool [red], they are very luminous, and therefore bright. In the Main Sequence, stars that are cool are not as luminous.

How do you know a star is dying?

When the helium fuel runs out, the core will expand and cool. The upper layers will expand and eject material that will collect around the dying star to form a planetary nebula. Finally, the core will cool into a white dwarf and then eventually into a black dwarf.