1.1) In a star's core the average mass number for ions which are not hydrogen orhelium is 10. The mass fractions of hydrogen is 0.60, of helium is 0.38, and all otherelements is 0.02. Calculate the average ion mass in units of mH.1.2) Explain two assumptions behind the Kelvin-Helmholtz timescale.1.3) In the outer core of a massive star the temperature is 108 K. The mean particleweight is u = 0.62. Calculate the density of this region if the radiation pressure isequal to the thermal pressure.1.4) For temperatures around 1.5 x 10' K in a stellar core, describe why it is hydrogeninstead of heavier ions which undergo fusion. Also, when the temperature is higher,describe why higher mass ions can undergo fusion.1.5) Describe two possible causes of convective instability in the outer regions of alow mass star.

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Astronomy

1st Edition

ISBN:9781938168284

Author:Andrew Fraknoi; David Morrison; Sidney C. Wolff

Publisher:Andrew Fraknoi; David Morrison; Sidney C. Wolff

Chapter5: Radiation And Spectra

Section: Chapter Questions

Problem 22E: Explain how we use spectral absorption and emission lines to determine the composition of a gas.

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