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Upcoming Events

Upcoming Events. Sign-up for semester Project topics (Now). On-Campus Observing. Stellar Spectral Classification. Tiffany Pewett pewett@chara.gsu.edu. Different Spectral Types. O,B,A,F,G,K,M Larger, hotter  smaller, cooler Subtypes:0-9 0 is hottest of type, 9 is coolest Ex: B7 & K4.

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Upcoming Events

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  1. Upcoming Events • Sign-up for semester Project topics (Now). • On-Campus Observing

  2. Stellar Spectral Classification Tiffany Pewett pewett@chara.gsu.edu

  3. Different Spectral Types O,B,A,F,G,K,M Larger, hotter smaller, cooler Subtypes:0-9 0 is hottest of type, 9 is coolest Ex: B7 & K4

  4. Stellar Spectra • Use a spectrograph to spread starlight into a rainbow. • Absorption lines show what the star is made of! • Blackbody Curve can show us the temperature(=spectral type)

  5. Absorption Lines

  6. Blackbody Curves

  7. Starting the Lab

  8. Identifying Lines

  9. Finding Spectral Type

  10. Using “Difference”

  11. To Complete the Lab • Answer all questions on front page fully. • Classify ALL spectra on back as accurately as you can. • Provide “reasons” for the at least three of the spectra that you classify (not all), using specific spectral lines. • Ex: He I, Halpha, & CaII lines match between A0 and A5.

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