Unformatted text preview: ω Centauri. 3. The SMC is farther away than the LMC, and it’s Cepheid variables are nearly a magnitude fainter. Is its further distance enough to explain this? If not, what other explanation might there be? 4. Assume a closed-box model for the chemical evolution of the Milky Way. If the initial metallicity was 0, and the present-day gas fraction is about 1%, what has been the average yield p of heavy element production throughout Galactic history (assuming its present metallicity is Z ± ? The present-day metallicity of the LMC is 0 . 5 Z ± and its present-day gas fraction is 5%. Has its average yield p been larger or smaller than the Milky Way’s?...
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- Spring '11
- Galaxies, Roche lobe, inner Lagrangian point, Roche lobe radius