Astronomy 101 Exam 5 questions and
Verified Answers
pair of stars that we see distinctly as stars orbit each other - ANSWER Visual binary
a pair of stars that orbit in the plane of our line of sight - ANSWER Eclisping binary
detect binary nature by observing doppler shifts in spectral lines - ANSWER Spectroscopic
binary
graph of apparent brightness vs time - ANSWER light curve
can apply keplers 3rd law only if measured _________ and _________ of both stars - ANSWER
Orbital period and separation
luminostiy depends on both ________ and __________ - ANSWER surface temperature and
surface area(radii)
very large and very bright - ANSWER Supergiant
small and very high t - ANSWER white dwarf
stars luminosiy class is more related to ______ than _______ - ANSWER size, luminosity
, designated by OBAFGKM, tells us surface T - ANSWER spectral lines
based on luminosity and tells us about stars radii - ANSWER Luminosity class
_______ is the most important attribute of a hydrogen fusing star because _______released by
hydrogen fusion in core equals the energy lost from the stars surface - ANSWER Mass
Main sequence stars mass determines both ___________ and ______________ - ANSWER
luminosity and surface T
star born with limited supply of core hydrogen and therefore can remain as a hydrogen
fusing star for only limited time - ANSWER Main sequence lifetime
Stars lifetime depends on ___________ and ___________ - ANSWER Mass and luminosity
White dwarfs are hot because of __________ and dim because of __________ - ANSWER
exposed core, lack of energy source
many stars congregate in groups from which they formed - ANSWER Star cluster
the cool clouds in which stars form - ANSWER molecular clouds
a star that is still in the process of forming - ANSWER protostar
Most interstellar clouds remain stable in size because the force of gravity is opposed by
_______ within the cloud. - ANSWER thermal pressure
Which part of the electromagnetic spectrum generally gives us our best views of stars
forming in dusty clouds? - ANSWER infrared
Verified Answers
pair of stars that we see distinctly as stars orbit each other - ANSWER Visual binary
a pair of stars that orbit in the plane of our line of sight - ANSWER Eclisping binary
detect binary nature by observing doppler shifts in spectral lines - ANSWER Spectroscopic
binary
graph of apparent brightness vs time - ANSWER light curve
can apply keplers 3rd law only if measured _________ and _________ of both stars - ANSWER
Orbital period and separation
luminostiy depends on both ________ and __________ - ANSWER surface temperature and
surface area(radii)
very large and very bright - ANSWER Supergiant
small and very high t - ANSWER white dwarf
stars luminosiy class is more related to ______ than _______ - ANSWER size, luminosity
, designated by OBAFGKM, tells us surface T - ANSWER spectral lines
based on luminosity and tells us about stars radii - ANSWER Luminosity class
_______ is the most important attribute of a hydrogen fusing star because _______released by
hydrogen fusion in core equals the energy lost from the stars surface - ANSWER Mass
Main sequence stars mass determines both ___________ and ______________ - ANSWER
luminosity and surface T
star born with limited supply of core hydrogen and therefore can remain as a hydrogen
fusing star for only limited time - ANSWER Main sequence lifetime
Stars lifetime depends on ___________ and ___________ - ANSWER Mass and luminosity
White dwarfs are hot because of __________ and dim because of __________ - ANSWER
exposed core, lack of energy source
many stars congregate in groups from which they formed - ANSWER Star cluster
the cool clouds in which stars form - ANSWER molecular clouds
a star that is still in the process of forming - ANSWER protostar
Most interstellar clouds remain stable in size because the force of gravity is opposed by
_______ within the cloud. - ANSWER thermal pressure
Which part of the electromagnetic spectrum generally gives us our best views of stars
forming in dusty clouds? - ANSWER infrared
