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Int Sci 1.1 - Unit 3 - Characteristics of Stars

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by

Angela Forlizzi

on 20 August 2014

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Transcript of Int Sci 1.1 - Unit 3 - Characteristics of Stars

How are stars classified?
color

temperature

size

composition

brightness
Characteristics
color reveals temperature

hottest stars (20,000 deg C) are blue

coolest stars (3,200 deg C) are red
Characteristics
sizes vary

most stars are size of our sun

large stars are giants or supergiants

white dwarfs are about size of Earth

neutron stars 20km in diameter
Most stars...
are approximately 73%
Hydrogen

25%
Helium
and 2% other elements

Spectrograph
a device that breaks light into colors and produces an image of the resulting spectrum
Characteristics of Stars
Int Sci 1.1 - Unit 3

Line Emission Spectra
Brightness
Depends on size and temp

Apparent Brightness
brightness as seen from Earth

Absolute Brightness
the brightness if placed at standard distance from Earth
Apparent change in position of an object when you look at it from different places

Used to measure distance of stars

Parallax
Space and everything in it


Light-year
distance that light travels in one year

9.46 trillion kilometers

light travels at 300,000,000 m/s
Universe
Full transcript