How to be an Astronomer

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Astronomy at Glasgow University
LIGO gravitational wave observatory, Hanford, US
Observatory and radio telescope in Maryhill,
Glasgow
Binary stars coalescing
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Studying the Stars
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Some Questions About Stars
What are stars made of? How old are they? How
were they born? How will they end?
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Tools for studying the stars
Spectroscope
Telescope
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Orion The Hunter
Betelgeuse a red star
Rigel a blue star
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Sunlight and rainbows
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Sunlight and rainbows
Glasgow
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Sunlight and rainbows
Potala Palace, Tibet
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Sunlight and rainbows
colours separated!
PRISM
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Sunlight and rainbows
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The Suns Spectrum
Dark lines
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The spectrum of sodium
A streetlight looks yellow-orange, but in fact it
is also producing red, green and blue light!
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Spectra fingerprints of the elements
CALCIUM
HYDROGEN
IRON
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The suns spectrum magnified
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Spectroscope

• A spectroscope is an instrument to split up light
  into different colours.
• Light comes in through a small slit
• It is split into colours by a diffraction grating.

BEAM OF LIGHT
Slit
Spectroscope
Diffraction grating
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Activity make your own spectroscope
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VIDEO
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Spectral Classification

• All stars can be classified from their spectra.
• The spectral sequence is also a temperature
  sequence.
• Subcategories can give us a stars temperature
  with 5 accuracy.

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