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JoAstro
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As the Stephan-Boltzmann's Law says, the minimal change in a star's mass would have a massive effect on its luminosity, but can necessarily two stars with the same mass have the same luminosity?
JoAstro said:can necessarily two stars with the same mass have the same luminosity?
Statement number 2 is woefully wrong.JoAstro said:I have two statements and they say as follows:
1. A 3sun star is seen to have a luminosity of 40 Lsun, which is too bright to be from the main sequence.
2. Two stars of the same mass must have the same luminosity.
I know that the first one is partly true but according to the solar-luminosity calculation: L ∝ Msun3.5
L ∝ 33.5 = 46.76 Lsun
But number two?
Why is that too bright to be on the main sequence? It sounds about right for the main sequence, actually, as you get below.JoAstro said:1. A 3sun star is seen to have a luminosity of 40 Lsun, which is too bright to be from the main sequence.
That is approximately true on the main sequence, though deviations also occur for all the reasons mentioned above.2. Two stars of the same mass must have the same luminosity.
That's why the first one is not very true at all, the star has a brightness that sounds a lot like it is on the main sequence, perhaps modified slightly by one of the abovementioned considerations.I know that the first one is partly true but according to the solar-luminosity calculation: L ∝ Msun3.5
L ∝ 33.5 = 46.76 Lsun
The luminosity of a star is directly related to its mass. This means that two stars with the same mass will have the same luminosity.
The luminosity of a star is determined by how much energy it produces through nuclear fusion. This process is dependent on the mass of the star, so stars with the same mass will have the same luminosity.
Yes, it is possible for two stars with different masses to have the same luminosity. This can occur if the more massive star is in a later stage of its life cycle and has already burned through most of its fuel, while the less massive star is still early in its life cycle and has not yet reached its peak luminosity.
Yes, the composition of a star can affect its luminosity. Stars with a higher percentage of heavier elements will have a higher luminosity, as these elements produce more energy during nuclear fusion.
The luminosity of a star changes over its lifetime as it burns through its fuel. As the star ages and runs out of fuel, its luminosity will decrease until it eventually becomes a white dwarf or neutron star with a much lower luminosity compared to its earlier stages.