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The 15,000 K black-body spectrum (dashed line) matches the visible part of the stellar SPD much better than the black body of 9500 K. All spectra are normalized to intersect at 555 nanometers. In astronomy , the color temperature is defined by the local slope of the SPD at a given wavelength, or, in practice, a wavelength range.
The range of isothermal color temperatures for both diagrams is from 1000 K (1000 MK −1) to 10 000 K (100 MK −1). Contracted from the term micro reciprocal degree , the mired ( / ˈ m aɪ r ɛ d / [ 1 ] ) is a unit of measurement used to express color temperature .
3000 K Warm white compact fluorescent and LED lamps 3200 K Studio lamps, photofloods, etc. 3350 K Studio "CP" light 5000 K Horizon daylight, Tubular fluorescent lamps or cool white/daylight compact fluorescent lamps (CFL) 5500–6000 K Vertical daylight, electronic flash: 6200 K Xenon short-arc lamp [1] 6500 K Daylight, overcast 6500–9500 K
Red arrows show that 5780 K black bodies have 501 nm peak wavelength and 63.3 MW/m 2 radiant exitance. Correlated color temperature ( CCT , T cp ) refers to the temperature of a Planckian radiator whose perceived color most closely resembles that of a given stimulus at the same brightness and under specified viewing conditions."
5000 K, 12 GPa melting point of diamond [4] 5100 K in cyanogen–dioxygen flame; 5516 K at dicyanoacetylene (carbon subnitride)–ozone flame; 5650 K at Earth's Inner Core Boundary; 5780 K on surface of the Sun; 5933 K, boiling point of tungsten; 6000 K, mean of the Universe 300,000 years after the Big Bang
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In cool stellar atmospheres (T < 5000 K), like those of newborn stars, the dominant source of opacity is the H − ion, for which and , we get = and =. Since A is much smaller than 1, the Hayashi track is extremely steep: if the luminosity changes by a factor of 2, the temperature only changes by 4%.
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