Test 2
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18 Terms
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Luminosity
amount of power a star radiates (does not depend on distance)
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apparent brightness
the amount of starlight that reaches earth
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Distance
1r:1. , 2r:1/4, 3r:1/9
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Magnitude
negative bright positive dark
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Absolute magnitude
how bright 0 parsecs away
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apparent mag> abs mag
star is farther than 10 parsecs
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Apparent < absolute
closer than 10 parsecs
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Stellar parallax
star appears at two different positions in the sky during earths different seasons
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d=1/p
p in arc seconds, d in parsecs
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higher temperature
bluer star
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Lower temperature
Redder star
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star can have high total luminosity if…
its hot and heavy
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main sequence stars
convert h to he in core
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low mass stars
white dwarfs
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High mass stars
neutron star
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Very large
black hole
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All stars in star clusters are…
the same age and the same distance from earth
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With 10 parsecs…
absolute fainter than apparent
Note 
Flashcards (194)