Astronomy 100 Starlight, Starbright.

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Presentation transcript:

Astronomy 100 Starlight, Starbright

First star I see tonight I wish I may, I wish I might Star light, star bright First star I see tonight I wish I may, I wish I might Have the wish I wish tonight

1st GOAL: Understand spectra. 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 6:35 (40 minutes) Heat= color. Black body = collisions. Even with elastic collisions, you lose some energy. Energy = light The nature of light. Light is energy. Photons are wavicles Atoms – electrons – energy levels. Wavelength – diff amounts of energy image page 103 7:15 (15 minutes) Break7:30 (30 minutes) Continuous spectrum – black body Planck Curve Emission Spectrum Light Decoders Absorption Spectrum Types of Stars/Types of Spectra Metallicity – how come there’s more than just Hydrogen lines? Annie Jump Cannon! OBAFGKMHow Spectra Look Now Doppler Effect Red-shift Blue-shift8:00 (5 minutes) Review8:05 (15 minutes) Introduce 2 assignments, and make groups.

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 6:35 (40 minutes) Heat= color. Black body = collisions. Even with elastic collisions, you lose some energy. Energy = light The nature of light. Light is energy. Photons are wavicles Atoms – electrons – energy levels. Wavelength – diff amounts of energy image page 103 7:15 (15 minutes) Break7:30 (30 minutes) Continuous spectrum – black body Planck Curve Emission Spectrum Light Decoders Absorption Spectrum Types of Stars/Types of Spectra Metallicity – how come there’s more than just Hydrogen lines? Annie Jump Cannon! OBAFGKM How Spectra Look Now Doppler Effect Red-shift Blue-shift8:00 (5 minutes) Review8:05 (15 minutes) Introduce 2 assignments, and make groups.