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Unlocking the Mysteries of Stars: Spectral Sequences and Stefan-Boltzmann Law

Unravel the secrets of stars through the Stefan-Boltzmann law and spectral sequences. Explore how knowledge of these laws leads to understanding the temperatures and radii of stars, as well as the circumstances under which objects produce various spectral signatures. Dive into the spectral classification of stars - OBAFGKML - for a refined understanding of stellar properties. Learn about Balmer lines and measuring uncertainties to improve accuracy in determining stellar temperatures. Join us on a cosmic journey to explore the intriguing realms of celestial bodies!

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Unlocking the Mysteries of Stars: Spectral Sequences and Stefan-Boltzmann Law

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  1. Cosmic Perspective Sec. 15.1

  2. Explain how knowledge of Stefan-Boltzmann law leads to understanding of temperatures and radii of stars. • Summarize the circumstances under which objects produce thermal (continuous), emission line, or absorption line spectra. • Explain what is meant by the spectral sequence of stars. OBAFGKML T

  3. Explain what is meant by the spectral sequence of stars

  4. Spectral classification needed refinement O B A F G K M http://www.astro.uiuc.edu/~kaler/sow/class-g.html • Explain what is meant by the spectral sequence of stars

  5. Spectral Sequence of Stars O B A F G K M • Explain what is meant by the spectral sequence of stars

  6. Explain what is meant by the spectral sequence of stars. OBAFGKML T What condition in the atom is needed to produce Balmer lines?

  7. Dealing with Measurement Uncertainties c = 299,792,458 meters per second

  8. Uncertainties in measurements

  9. Spectral Type vs Temperature Note: these relationships are for luminosity class V stars. (See Sec. 15.2 of your text.

  10. Monday: Bring laptops - We start Part C In search of a more accurate way to determine stellar temperatures. 5770 K !!!

  11. Pyrometer (Stefan-Boltzmann Law in action on Earth)

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