GSU ASTR 1020 Final Exam Questions and Answers 2024
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Course
ASTR 1020
Institution
ASTR 1020
Luminosity - The total amount of power a star emits into space that's measured in watts.
Apparent Brightness - Amount of starlight that actually reaches Earth
HR Diagram - is a graphical tool that astronomers use to classify stars according to their luminosity, spectral type, color, temperatu...
GSU ASTR 1020 Final Exam Questions
and Answers 2024
Luminosity - The total amount of power a star emits into space that's measured in watts.
Apparent Brightness - Amount of starlight that actually reaches Earth
HR Diagram - is a graphical tool that astronomers use to classify stars according to their
luminosity, spectral type, color, temperature and evolutionary stage. Stars in the stable
phase of hydrogen burning lie along the Main Sequence according to their mass.
OBAFGKM - Oh Be A Fine Girl Kiss Me
Main Sequence - the vast majority of stars lie on the main sequence
Giants - lie slightly above main sequence
White Dwarfs - lie below main sequence
Eclipsing binary - ♣ An eclipsing binary is a star system where one star passes directly
in front of another star as they orbit their common center of mass relative to our line of
sight.
Gravitational Equilibrium - is the outward push of gas pressure in the sun's core exactly
balanced by the inward pull of its own gravity
GSU ASTR 1020 Final Exam
, GSU ASTR 1020 Final Exam
Sunspots - Due to the Zeeman effect and they're caused when the local magnetic field
bulges out of the sun's surface
Prominences - are loops of plasma that emerge from the sun.
Solar Flares - are the release of X-rays and other high energy photons
Coronal Mass Ejections - are caused by powerful flares that launch plasma into
interplanetary space.
Stellar Fusion - is the process by which the natural abundances of the chemical
elements within stars change due to nuclear fusion reactions in the cores and their
overlying mantles. Stars are said to evolve (age) with changes in the abundances of the
elements within.
Proton-proton chain - is a reaction in which stars convert hydrogen to helium
The Interstellar Medium - 70% hydrogen, 28% helium, 2% metals - matter and radiation
that exists in the space between the stars systems in a galaxy
Effects of Interstellar Dust - reddening of dust in ISM
Molecular Clouds - star forming regions
Gravitational Collapse - -collapse of a nebula into a protostars
♣ During the collapse of the nebula, the clouds heat up which in turn increases the spin
rate.
♣ During the collapse, the angular momentum of the initial gas cloud is conserved.
GSU ASTR 1020 Final Exam
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