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Stars
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Measurement of star positions and motions
Astrometry
Amount of light the star gives off- wavelength and color of the stars
Photometry
Dispersion of light into it's compiler colors to determine the energy
Spectroscopy
How bright the star looks to the observer
Apparent magnitude
Six levels of magnitude
1 brightest
6 faintest
Defined as the apparent magnitude a star would have if it which places at a distance of 10 parsecs and 32.6 light years
Absolute magnitude
Stages of a star
Protostar- fetus
Fusion ignition infancy- adulthood
Red giant- middle age
White drawf/black hole- old age death
3 colors
Blue hottest
Yellow middle
Red cooler
The energy received per second per sq meter at the position of the observer
Energy flux
Energy output of an object
Luminosity
Formation of stars
Gas and dust
Molecular cloud forms
Gravitational contraction
Protostar formed
Bok globules ( cocoon star)
Temparture rises-core formed
Outer layer blown away and a star is revealed
4 types of galaxies
Elliptical-blob of light
Spiral-flat
Irreqular-no shape
SO-sharesmore then 1 characteristic
Author
lisabug
ID
47965
Card Set
Stars
Description
stars
Updated
2010-11-07T21:53:44Z
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