Hypothetically, how hot do you think a green star would be?
about two minutes of web serach led me to
http://www.astronomycafe.net/qadir/q72.html
You might try it next time you have a general question like this.
To hypothesize the temperature of a green star, we first need to understand why stars can appear green. The color of a star is primarily determined by its surface temperature.
Stars emit light across a wide range of wavelengths, and their peak emission occurs in a particular range depending on their temperature. Higher temperatures shift the peak toward shorter (bluer) wavelengths, while lower temperatures shift it toward longer (redder) wavelengths.
Green light has a wavelength of roughly 520-570 nanometers. For a star to appear green, it would need to emit a significant amount of light in that range.
Now, let's consider the temperature scale of stars. Stars come in various spectral types, classified using the Harvard spectral classification system from hottest to coolest as O, B, A, F, G, K, M. Each spectral type corresponds to a specific temperature range.
O-type stars are the hottest, with temperatures exceeding 30,000 Kelvin, and they emit predominantly in the ultraviolet range. Even though their temperature could exceed the green light's wavelength, their peak emissions in the visible light spectrum are still in the bluer region.
To make a star appear green, we would need a star with a surface temperature that peaks in the green light range. Hypothetically, a star falling into the F, G, or K spectral type range (around 6,000-7,500 Kelvin) might have a peak emission in the green light region. However, the actual color perception of a star is influenced by other factors, such as its atmosphere and the observer's visual perception.
It's important to note that green stars in reality are extremely rare, and none have been observed to emit predominantly in the green light range. Hence, our hypothetical estimation is speculative and may not reflect the true nature of green stars.