Exam (elaborations)
ASTRO 1 EXAM 3 QUESTIONS AND ANSWERS 2024
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ASTRO 1 EXAM 3 QUESTIONS AND ANSWERS 2024
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ASTRO 1EXAM 3What are the properties of a star? - ANSWERS-luminosity, mass, size,
temperature, and age
What affects the luminosity of a star? - ANSWERS-size and temperature directly
affect luminosity; larger size = larger light-emitting area = greater luminosity;
higher temperature = greater luminosity
Where are main sequence stars located on the H-R diagram? - ANSWERS-they
form a band from the lower right across the upper left
What are stars on the main sequence burning as fuel? - ANSWERS-hydrogen into
helium
for stars on the main sequence does higher temperature= higher luminosity? -
ANSWERS-yes
Where do red dwarfs (cool, faint, and small) fall on the H-R diagram? blue giants
(hot, bright, and large)? (main sequence) - ANSWERS-red dwarfs (cool, faint, and
small) on lower right; blue giants (hot, bright and large) on upper left
, What determines where on the main sequence a star lives, and what the main
sequence lifetime is for the
star? - ANSWERS-mass; more-massive main sequence stars are on the upper left
of H-R diagram; masses range from about 0.1 to 100 times the mass of the Sun;
sizes range from 0.1 to 15 times the radius of the Sun
Where does luminosity range from on the main sequence stars (compared to the
sun)? - ANSWERS-luminosities of main sequence stars range from 10^−3 to 10^6
times that of the Sun
for main sequence stars, how does the age range from those stars? - ANSWERS-
age ranges from few million years for more massive stars to much more than 14
billion years (age of the universe) for less massive stars; REMEMBER, the more
massive stars use their greater fuel supply more rapidly
What are red giants and supergiants NOT on the main sequence like? - ANSWERS-
burning helium not hydrogen anymore; starting to die; size is large, so they are
luminous even though they are relatively cool
What are white dwarfs NOT on the main sequence like? - ANSWERS-hot, small
and dim, so fall on lower left of H-R diagram; dying stars
Can you identify on the H-R diagram - ANSWERS-hot and cold stars; blue and red
stars
high and low luminosity stars
large radius and small radius stars
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