Properties of stars
Hertzsprung-Russell diagram
Variable stars and Interstellar matter
Stellar evolution
Stellar remnants
100
A hot star
What kind of star emits short-wavelength light, appears to be blue, and has a temperature above 30,000K?
100
brightness(absolute magnitude) and temperature.
The Hertzsprung- Russell diagram shows the relation between____ and_______.
100
Pulsating variables
What fluctuates regularly in brightness?
100
Gravity (contracts) and thermal nuclear energy (expands)
Two opposing forces in a star are______ and______.
100
White dwarfs only get to be the size of the Earth, but most of them are smaller.
How big do white dwarfs get to be?
200
Difficult
Is measuring a star's distance easy or difficult?
200
luminosity (brightness), temperature
The diagram is made by plotting (graphing) each star's________ and______.
200
An explosive event that has sudden brightening, a good example of an eruptive variable.
What is a nova?
200
Birth, protostar, main-sequence, Red giant, burnout, than death.
What are the stages in Stellar evolution?
200
It cools to become a black dwarf.
What does a white dwarf cool to become?
300
It is used to measure a distance to a star.
What is a stellar parallax?
300
Main sequence
What kind of star is the sun?
300
"The vacuum of space"
What is between the stars?
300
Stars exist because of gravity.
Why do stars exist?
300
100 million tons
What does a pea size sample of a neutron star weigh?
400
second of arc
The largest parallax is less than one_______.
400
Main sequence stars.
What is 90% of all stars?
400
A nebula is a cloud of dust and gases.
What is a nebula?
400
It depends on the mass.
What does the final stage in stellar evolution depend on?
400
An atomic nucleus
What has the same density as a neutron star?
500
A yellow star
What color star has a temperature between 5,000 and 6,000K?
500
A main sequence star
What kind of star has surface temperature around 20,000K ?
500
A bright nebula and a dark nebula
What are two major types of nebulae?
500
0.5 solar mass
What is the mass of of a low mass star?
500
Degenerate
What kind of matter is a white dwarf?
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