- Who discovered the relationship between a star’s temperature and brightness?
- What kind of stars are the hottest?
- Which star is least hottest?
- Does the brightness of a star depends on its temperature?
- Are hotter stars brighter?
- What factor affects the color of a star?
- Why some stars are blue?
- What’s the hottest star in the universe?
- What determines how long a star will live?
- Why are the nearest stars ones with the lowest mass and lowest luminosity?
- Why do stars twinkle?
- What is the general relationship between temperature and star color?
- Which color star is the coolest?
- Why is a star brightest at its coolest?
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..
What kind of stars are the hottest?
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. So the hottest stars in the Universe are going to be a blue star, and we know they’re going to be massive.
Which star is least hottest?
The seven main types are M, K, G, F, A, B and O. M stars are the coldest stars and O stars are the hottest.
Does the brightness of a star depends on its temperature?
It depends on both the radius of the star and on its surface temperature. A small, hot object can have the same luminosity as a large, cool object. If the luminosity remains the same, an increase in the size (surface area) of the object must result in a decrease in the temperature to compensate and vice-versa.
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 factor affects the color of a star?
The color of a star is mainly decided by the surface temperature of the star but other factors also affect color of the star. Human eye is more sensitive to blue light than red in the night which gives bluish appearance to the stars.
Why some stars are blue?
The color of a star is linked to its surface temperature. The hotter the star, the shorter the wavelength of light it will emit. The hottest ones are blue or blue-white, which are shorter wavelengths of light. Cooler ones are red or red-brown, which are longer wavelengths.
What’s the hottest star in the universe?
Star WR102The hottest star in our list is, The Star WR102 which is a blue star with surface Temperature of over 2,10,000 kelvin is the hottest star ever recorded. With an increase in Temperature, the star turns bluish in color.
What determines how long a star will live?
A star’s life expectancy depends on its mass. Generally, the more massive the star, the faster it burns up its fuel supply, and the shorter its life. The most massive stars can burn out and explode in a supernova after only a few million years of fusion.
Why are the nearest stars ones with the lowest mass and lowest luminosity?
Why are most nearby stars low-mass, low-luminosity stars? Low-mass, low-luminosity stars are more common because they are longer lived. 27. Suppose a main-sequence star suddenly started burning hydrogen at a faster rate in its core.
Why do stars twinkle?
As light from a star races through our atmosphere, it bounces and bumps through the different layers, bending the light before you see it. Since the hot and cold layers of air keep moving, the bending of the light changes too, which causes the star’s appearance to wobble or twinkle.
What is the general relationship between temperature and star color?
Stars emit colors of many different wavelengths, but the wavelength of light where a star’s emission is concentrated is related to the star’s temperature – the hotter the star, the more blue it is; the cooler the star, the more red it is.
Which color star is the coolest?
redThe hottest stars tend to appear blue or blue-white, whereas the coolest stars are red. A color index of a star is the difference in the magnitudes measured at any two wavelengths and is one way that astronomers measure and express the temperature of stars.
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.