What typically lies at the center of a planetary nebula
Describe the complete life cycle of the Sun and plot it on an HR diagram. What is a planetary nebula? What process gives rise to such a nebula? What typically lies at the center of a planetary nebula?
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Describe how we measure distance using "spectroscopic parallax". What is the practical limitation in using this technique, and what is the approximate distance (in parsecs) out to which this technique is useful.
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.
All solutions to the differential equation y'-2y=0 should also be solutions to the differential equation y''-ay'+ay=0. Determine the constant a such that this is true.
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.
What is a planetary nebula? What process gives rise to such a nebula? What typically lies at the center of a planetary nebula?
Write appropriate non-directional null and alternative hypotheses in words and symbols.
What are the possible remnants of a type II supernova? Where and in what process were all the heavy metals and rare-earth elements, like gold, created?
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.
If a study had a result of F (2, 147)= 4.56, p = 0.003, how many groups were in the study, and what was the sample size?
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