Astronomy 100

Starlight, Starbright

Star light, star brightFirst star I see tonight

I wish I may, I wish I mightHave the wish I wish tonight

• ANSWER NOW: (You will turn this in) Write, discuss, sketch, label – somehow communicate your knowledge and understanding of the electromagnetic spectrum. If you don’t think you have one, write/discuss/sketch/label a rainbow instead. Tell me everything you can.

• 1st GOAL: Understand spectra.– Vocabulary: wavelength, spectra, continuous spectrum,

emission spectrum, absorption spectrum, black-body spectrum, electron, energy levels, excited, Doppler effect, red shift, blue shift, metallicity

Antonine-education.co.uk

• Different wavelengths are different colors.• Different wavelengths are different energies.• Different colors are different energies.

• If you look directly at a heat source – you get ALL POSSIBLE COLORS – continuous spectrum or “black body” spectrum.

• If you look at a heated gas you get some colors because it’s not heat, it’s excited electrons.

Continuous Spectrum (Heat)

• http://an.hitchcock.org/repairfaq/sam/spctrm3.jpg

Physics.uiowa.edu

upei.ca

Spectra Activity

physics.umd.edu

http://physics.uoregon.edu

Classification Activity

OBAFGKM Spectra

KPNO .9m Telescope, AURA, NOAO, NSF

Solar Spectrum

odin.physastro.mnsu.edu

• http://www.youtube.com/watch?v=imoxDcn2Sgo

• http://www.youtube.com/watch?v=J43lAESftPs

• http://www.youtube.com/watch?v=-t63xYSgmKE

• Review: (You will turn this in)• Define three of these terms:

– Metallicity– Spectrum– Excited– Spectra– Doppler effect– Red shift