1 / 17

Cosmic Perspective Sec. 15.1

Cosmic Perspective Sec. 15.1. 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.

rafe
Download Presentation

Cosmic Perspective Sec. 15.1

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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)

More Related