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Physics 231: Section 3 Stellar Structure

Physics 231: Section 3 Stellar Structure. http://mimas.physics.drexel.edu/phys 231. HR Diagram of 22,000 nearby stars Parallaxes measured from Hipparcos. Spectral Types. HeI 3819. TiO. CaI. Balmer beta. Radius on the HR diagram. Luminosity Classes of Stars. The Pleiades.

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Physics 231: Section 3 Stellar Structure

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  1. Physics 231: Section 3Stellar Structure http://mimas.physics.drexel.edu/phys231 Phys 231, Topic 3: Stellar Structure

  2. HR Diagram of 22,000 nearby stars Parallaxes measured from Hipparcos Phys 231, Topic 3: Stellar Structure

  3. Spectral Types HeI 3819 TiO CaI Balmer beta Phys 231, Topic 3: Stellar Structure

  4. Radius on the HR diagram Phys 231, Topic 3: Stellar Structure

  5. Luminosity Classes of Stars Phys 231, Topic 3: Stellar Structure

  6. The Pleiades Phys 231, Topic 3: Stellar Structure

  7. Model HR diagram of a 10 Myr old star cluster Phys 231, Topic 3: Stellar Structure

  8. Phys 231, Topic 3: Stellar Structure

  9. Phys 231, Topic 3: Stellar Structure

  10. Hydrostatic Equilibrium • Just like in Freshman physics, make the forces cancel! Pressure above Layer of Gas Gravity Pressure below Phys 231, Topic 3: Stellar Structure

  11. From xkcd Phys 231, Topic 3: Stellar Structure

  12. Phys 231, Topic 3: Stellar Structure

  13. Radiative Transfer Radiation from below Less Dense Layer (low kappa) Dense Layer (high kappa) Radiation from below Phys 231, Topic 3: Stellar Structure

  14. Phys 231, Topic 3: Stellar Structure

  15. Detailed Density/Temperature profiles of the sun Screen Captured from Martin Weinberg’s stellar app. Link is On the course website. Phys 231, Topic 3: Stellar Structure

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