Stars appear to be exclusively white at first glance. But if we look carefully, we can notice a range of colors: blue, white, red, and even gold. In the winter constellation of Orion, a beautiful contrast is seen between the red Betelgeuse at Orion's "armpit" and the blue Bellatrix at the shoulder. What causes stars to exhibit different colors remained a mystery until two centuries ago, when Physicists gained enough understanding of the nature of light and the properties of matter at immensely high temperatures.
Specifically, it was the physics of blackbody radiation that enabled us to understand the variation of stellar colors. Shortly after blackbody radiation was understood, it was noticed that the spectra of stars look extremely similar to blackbody radiation curves of various temperatures, ranging from a few thousand Kelvin to ~50,000 Kelvin. The obvious conclusion is that stars are similar to blackbodies, and that the color variation of stars is a direct consequence of their surface temperatures.
Cool stars (i.e., Spectral Type K and M) radiate most of their energy in the red and infrared region of the electromagnetic spectrum and thus appear red, while hot stars (i.e., Spectral Type O and B) emit mostly at blue and ultra-violet wavelengths, making them appear blue or white.
To estimate the surface temperature of a star, we can use the known relationship between the temperature of a blackbody, and the wavelength of light where its spectrum peaks. That is, as you increase the temperature of a blackbody, the peak of its spectrum moves to shorter (bluer) wavelengths of light. This is illustrated in Figure 1 where the intensity of three hypothetical stars is plotted against wavelength. The "rainbow" indicates the range of wavelengths that are visible to the human eye.
The relationship is that the color is an indication of the star's surface temperature. For example, red stars are cooler, while blue stars are hotter. You can find more details in the Wikipedia article "Stellar classification".
Blue stars are the hottest, and red stars the coolest. Our sun is orangey, so it's kinda in between blue (hot) and red (cool).
The answer to this question is Hertzsprung-Russell diagram
So in terms of of color red is cool, yellow is medium, blue-violet is hot.
The colour of a star is dependent on the temperature of the star.If the temperature is approx 30000k.Then its colour is blue. If the temperature is between 3000-4000k.Then its a red giant. If the temperature is over 5200-6000.Then its a yellow star. If the temperature is < 500k.Then its a brown dwarf. And so on
The relationship is that the color is an indication of the star's surface temperature. For example, red stars are cooler, while blue stars are hotter. You can find more details in the Wikipedia article "Stellar classification".
The color of a star is related with the wavelength of the light observed. Wien's Law states that: Peak Wavelength x Surface Temperature = 2.898x10-3 Peak Wavelength is the wavelength of the highest intensity light coming from a star.
Blue stars are the hottest, and red stars the coolest. Our sun is orangey, so it's kinda in between blue (hot) and red (cool).
Hertzsprung and Russell.
Hertzsprung and Russell.
The Hertzsprung-Russel diagram shows brightness versus color (the color reflects the star's temperature).
The color of the star Indicates its Temperature.
you can tell the temperature by its color
Brightness tells you the temperature and mostly temperature would tell the brightness of the star that we are talking about.
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the relationship between a star's luminosity, temperature, absolute magnitude, and spectral type.
The answer to this question is Hertzsprung-Russell diagram