Quick Answer: Is There A Relationship Between A Star’S Temperature And It’S True Brightness?

Can 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..

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.

What is the relationship between the size of a main sequence star and its temperature and brightness?

The main sequence is the population of stars shown diagonally from top left to bottom right. Brightness clearly increases with temperature, and with any incandescent (glowing from heat) object, the hotter the object the bluer its light.

Which are the hottest stars?

The hotter the star, the further up the spectrum you go. The hottest stars are the blue stars. A star appears blue once its surface temperature gets above 10,000 Kelvin, or so, a star will appear blue to our eyes.

How does the temperature of a star affect its brightness?

Luminosity Is Caused By… If you think about it, a larger star has more surface area. That increased surface area allows more light and energy to be given off. Temperature also affects a star’s luminosity. … As a star gets hotter, the number of nuclear reactions increases.

Is there a relationship between mass and temperature of stars?

Observations of thousands of main sequence stars show that there is definite relationship between their mass and their luminosity. The more massive main sequence stars are hotter and more luminous than the low-mass main sequence stars. … Massive stars need higher core temperatures to be stable!

What star has the highest luminosity?

List of stars more luminous than any closer starNameConstellationBolometric luminosity (Solar lum.)Sun1Alpha Centauri ACentaurus1.519SiriusCanis Major25.4VegaLyra40.1218 more rows

Who discovered the relationship between a star’s temperature and brightness?

Ejnar HertzsprungHertzsprung (1873–1967) and Russell (1877–1957): (a) Ejnar Hertzsprung and (b) Henry Norris Russell independently discovered the relationship between the luminosity and surface temperature of stars that is summarized in what is now called the H–R diagram.

Can stars have different degrees of brightness?

The apparent brightness, or apparent magnitude, depends on the location of the observer. Different observers will come up with a different measurement, depending on their locations and distance from the star.

Which color star is the coolest?

Red starsRed stars are the coolest. Yellow stars are hotter than red stars. White stars are hotter than red and yellow. Blue stars are the hottest stars of all.

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.