What happens to the temperature of main sequence stars as the brightness increases?

Answer 1

Stars in their Main Sequence stage have generally proportional temperature and color. The color-temperature spectrum of a star ranges from red (2000-3000 Kelvins) to blue (25,000+ Kelvins). Red Giants have a relatively high luminosity and low temperatures. White dwarfs have relatively low luminosity and high temperatures. Main Sequence stars are proportional temperature/color therefore they can vary from relatively high luminosity and temperature to relatively low luminosity and temperature.

Absolute Magnitude is the star's genuine brightness. It's apparent magnitude is it's brightness from earth. A star can only be accurately classified once data on it's absolute magnitude is acquired.

Answer 2

Brightness is a value of luminosity verses distance as viewed from a point.

From Earth, the luminosity of a star is it's apparent magnitude, whereas absolute magnitude is it luminosity as viewed from a set point (for stars this value is about 32 light years).

Because of this a star can loose temperature but gain in diameter and appear brighter, in contrast a star can contract and thus shrink, but heat up and appear brighter.

Brightness is related to temperature, not the other way around.

Answer 3

Yes. The hotter a star is, the brighter it is.

Very hot stars > 30,000 kelvin have a luminosity of 30,000 times that of our Sun, whereas cool stars have a temperature of < 3,700 kelvin and are about 0.08 as luminous as our Sun.

[See link]

A star's brightness can have two values:-

Apparent magnitude - how bright it looks from Earth

Absolute magnitude - how bright it would be adjusted to a standard distance of 32.616 light years from Earth.

Answer 4

The only star that has any influence on the temperature is the Sun.

-- As a long-term statistical average, the temperature tends to rise during the part

of the day when the sun is in the sky, and during the part of the year when the sun

is high in the sky during the daytime.

-- As a long-term statistical average, the temperature tends to fall during the part

of the day when the sun is not in the sky, and during the part of the year when

the sun is low in the sky during the daytime.

Answer 5

Other things being equal, at higher temperatures the star will be brighter. The total amount of energy emitted is proportional to the fourth power of the absolute temperature (for example, the temperature on the Kelvin scale).

Answer 6

Surface temperature determines the brightness of main sequence stars. The higher temperature main sequence stars are more bright and the cooler ones are red and less luminous.

Answer 7

The brightness is very similar to the temperature, the brightness relies on the temperature

Answer 8

Absolute magnitude is the brightness of a star as it appears at sandard distances. Temperatures on the main-sequence begin from the least to the most.

Answer 9

The temperature of a star does relate to it's colour. A cool star is red, whilst a hot star is blue. [See related question]

Brightness is related to luminosity and distance.

Answer 10

The higher the temperature, the brighter the star.