Star, light and distance
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Star, light and distance. Explain EMR and the properties of light. Understand the use of spectroscopes. KEY WORDS LuminositySpectroscope Electromagnetic spectrum. Stars - classified by age, distance, and brightness Brightness ( luminosity ) of Stars

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Star, light and distance

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Star light and distance

Star, light and distance


Star light and distance

  • Explain EMR and the properties of light.

  • Understand the use of spectroscopes.

KEY WORDS

LuminositySpectroscope

Electromagnetic spectrum


Star light and distance

  • Stars - classified by age, distance, and brightness

  • Brightness (luminosity) of Stars

  • There are two amounts (magnitudes) of brightness:

  • Apparent magnitude – brightness as we see it.

  • Absolute magnitude – actually brightness.

  • Sun has a high apparent magnitude, because it is so close.

  • Sun has an average absolute magnitude.


Star light and distance

Star B looks brighter - apparent

Star B is closer to us than Star A.

- same Absolute magnitude.


Star light and distance

  • Colour and Temperature of Stars

  • Colour – shows much energy a star has.

  • Colder star glows red.

  • Hotter star glows bluish white or even blue.

The Sun is bigger than about 95% of stars.

  • Scientists use a spectroscope to analyse the light energy from stars.

  • Spectroscope - splits light up into a pattern of colours, like a rainbow.


Star light and distance

Light is a type of energy called:

Electromagnetic Energy


Star light and distance

The Electromagnetic Spectrum

  • Visible spectrum is the energy waves we can see.

  • Energy we cannot see:

  • ultraviolet, infrared, x-rays, microwaves, radiowaves, gamma rays.

  • Heated compounds give off a uniquespectrum.

  • By looking at the spectra for different stars, we can get some idea of what elements are present in them.

  • They can use the spectrum to determine in which direction a star is moving.


Star light and distance

Types of Electromagnetic energy

Low energyHigh energy

ROYGBIV

Red light is low energy – cool

Blue is high energy - hot


Star light and distance

Each gas in the star absorbs unique parts of the light energy as it is released.

The black lines in the spectrum show the elements that make up the gas surrounding the star.


Star light and distance

Light from the sun through a spectroscope

Absorption lines of Helium


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