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PHYS3116 - Assignment 2 (Worth 10%)
1. Running the stellar model program:c. [5 marks] Choose two stars of different mass and radius from the list of possible options below
(the R, L, P and T values are not the actual values for the star but a set of initial guesses
that can be used to run the code). Model these and comment on how the luminosity,
core temperature, and core pressure vary with changing mass and radius but not composition?
M X Y Log(R) Log(L) Log(P) Log(T) 1.3*Msol 0.65 0.25 9.8 26.0 16.7 7.4 1.5*
Msol 0.65 0.25 9.3 26.0 16.7 7.4 1.7*Msol 0.65 0.25 9.02 26.0 16.7 7.4 1.9*Msol 0.65 0.25 8.956 26.023 16.715 7.423
2. Using Kepler’s third law, estimate the total mass (in units of solar mass) of the Milky Way enclosed within the Sun’s orbit.
Assume the Sun is 8.5 kpc from the centre of the Milky Way and has an orbital speed of 220 km/s [5 marks].
3. Thinking about the properties of galaxies and how astronomers use them: a. [1 mark]
Choose one of the galaxies listed below from the Hubble Space Telescope image archive: