If you look at a (main sequence) star population from a very great distance over which you can hardly see the individual stars anymore (like looking at a neighbour galaxy or M101 in this example). These 2 aspects have an important consequence ! A blue star's total luminosity can be more than 1.000.000x !!! as bright as a red star's total luminosity. A red star has a low luminosity, a blue star has a high lumninosity.Only a fraction (1-5%) of the stars will be blueish, these stars are high-mass stars that live relatively very short. These are low-mass stars that have live relatively very long. by far most stars are Reddish (95-99%).This equilibrium is the reason for thes stars to emit light almost identically as a Black Body on broadband wevelenghts.įurthermore, it's important to realize the following 2 feautures of Main Sequence stars: During this main sequence phase, the stars are in hydrostatic & thermal equilibrium. This phase is usually the longest phase in a star's life/evolution from a cloud of gas to a white dwarf (which is a dying star in fact) or super novae for instance. These stars are in the first phase of their live, fusing hydrogen nuclei (protons) to helium nuclei in the core of the star. Most of the stars in our images are Main Sequence stars in our own galaxy, the Milky Way. The Black Body calibration model is based on real physics for the star colors of Main Sequence stars: So I will start here with giving a thorough explanation. I am too blame here, since I haven't yet provided instructions on this tool 🙄 but having said that, this is a very nice example to correct this now. First my compliments on great M101 data 😉
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