Classifying stars!
What IS a star anyway?!?!
STARS:
A star is a large ball of

ionized gas, held together by
gravity, that emits energy
prod...
Classifying Stars
SIZE!!!!

Temperature!!!

 Super Giant

 Hot = Red

 Red Giant

 Hotter = White

 Main

 Hottest =...
Relationship between surface temperature
and color of stars:
3,500 K
(red)

5,000 K
(yellow)

Just like car headlights
loo...
Apparent vs. Absolute
Apparent Magnitude
 The observed
luminosity of a celestial
body, such as a star, as
observed from e...
TOOLS OF ASTRONOMY

Spectrograph: A tool that is used to obtain
information from stars by breaking up the colors
they emit...
Chemical
compositions:

Each element absorbs different
wavelengths of light and shows
up as lines on a spectrum.
Temperature: Stars at
different temperatures
produce a different line
spectra.
Distances to stars
•Light Speed: Light travels
at 300,000 km/s.
•Light Year: The distance
light travels in a year.
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Star Classification

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Transcript of "Star Classification"

  1. 1. Classifying stars!
  2. 2. What IS a star anyway?!?! STARS: A star is a large ball of ionized gas, held together by gravity, that emits energy produced by nuclear reactions in its interior. Types of stars:  Stars are classified by their size, temperature, and brightness!
  3. 3. Classifying Stars SIZE!!!! Temperature!!!  Super Giant  Hot = Red  Red Giant  Hotter = White  Main  Hottest = Blue/White Sequence  White Dwarf  Neutron Star Brightness!  How bright it appears depends on it’s distance from us  How bright it actually is depends on its size & temp.
  4. 4. Relationship between surface temperature and color of stars: 3,500 K (red) 5,000 K (yellow) Just like car headlights look small and dim when they are far away and then BLIND you as they get closer, Stars are similar. 7,000 K (white) 25,000 K (blue) You may notice at night when you look up at the stars that some seem to be slightly different colors, that has to do with their temperature!
  5. 5. Apparent vs. Absolute Apparent Magnitude  The observed luminosity of a celestial body, such as a star, as observed from earth.  The apparent magnitude of a star depends on its luminosity and distance. Absolute Magnitude  The apparent magnitude a star would have if it were 32.6 light years away from Earth.
  6. 6. TOOLS OF ASTRONOMY Spectrograph: A tool that is used to obtain information from stars by breaking up the colors they emit. http://herschel.jpl.nasa.gov/farIRandSubmm.shtml
  7. 7. Chemical compositions: Each element absorbs different wavelengths of light and shows up as lines on a spectrum.
  8. 8. Temperature: Stars at different temperatures produce a different line spectra.
  9. 9. Distances to stars •Light Speed: Light travels at 300,000 km/s. •Light Year: The distance light travels in a year.
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