Online Physics Astronomy Questions On Stars Homework Help
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1.A red star and a blue star have the same size and are at the same distance from Earth. Which one looks brighter in the night sky? Why? (Ignore the interstellar reddening).
2.What is the fundamental explanation (in terms of atomic physics) of why hydrogen absorption lines are weak in O and M stars and strong in A stars. Why are molecular absorption lines strong in K and M stars but weak in O, B and A stars?
3.Star A and star B have the same apparent magnitude, but star B is twelve times further away than star A. How much more luminous is star B than star A? Suppose that star B also only has half the surface temperature of star A, what is the energy flux from the surface of star B compared to star A? What is the ratio of the radius of star B over the radius of star A.
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4.Describe how one can determine the mass of a star when it
a) is part of a binary system
b) when it is not part of a binary system. Mathematical details are not necessary , briefly outline the methods.
5.What is the Chandrasekhar limit in the context of white dwarfs and neutron stars? Give a brief explanation of the result if the mass of the core of a star exceeds the Chandrasekhar limit. Is it possible that one could find a black hole or a neutron star of one (1) solar mass? Is it possible that one could find a black hole or a neutron star of ten (10) solar masses? What happens if you keep adding mass to a white dwarf (be careful here, the answer is not obvious from the context of this question)? What happens if you keep adding mass to a neutron star?
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