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vocab quiz number 2
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18
Astronomy
11th Grade
10/30/2008

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Term
apparent magnitude
Definition
brightness as observed either by the eye, photoelectric cell or photography
Term
true brightness
Definition
depends on the size & surface temperature of a star
Term
absolute magnitude
Definition
calculate how bright each star would look at any given distance
Term
red giants
Definition
large stars that are cooler
Term
supergiants
Definition
higher absolute magnitude & hundreds of times as luminous as giants
Term
red supergiants
Definition
supergiants that are cooler
Term
dwarf
Definition
less luminous stars with absolute magnitude of +1 or less
Term
white dwarfs
Definition
stars that are very dense, small, faint & hot
Term
proper motion
Definition
rate at which the star changes it's position among other stars in the night sky
Term
radial velocity
Definition
rate at which the star is moving toward/away from us
Term
variable stars
Definition
change in brightness
Term
pulsating stars
Definition
change in brightness AND size
Term
red variable stars
Definition
cooler variable stars
Term
explosive stars
Definition
small dense stars that flare suddenly from faint obscurity into bright prominence & fade again
Term
nova
Definition
also known as an explosive star (new)
Term
supernova
Definition
a "super large explosion"
Term
binary stars
Definition
2 stars that revolve around the same point; physically attached
Term
visual binary
Definition
pair of stars that can be seen as 2 stars on the telescope
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