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Stars & Galaxies Unit 2
Terms in this set (24)
Stellar Paralax was not seen by the Greeks because ____.
naked eye measurements could not see it
Annie Jump Cannon's stellar classification scheme is based on ____.
a star's surface tempurature
You image a region of the sky in March, and again in September. 3 stars appear to have moved in the Sep. photo. The star whose position moved the most is ________ .
The primary reason that the stars do not appear as bright as they actually are is that ____.
that the distance to the star dilutes light from the star and dims the star
A 100-watt incandescent light bulb produces about ________ photons each second.
The Dopple Effect on stellar spectra can be used to measure ____.
the radial velocity of the star
The fundamental property of a star which determines its lifetime and evolutionary fate is its ________ .
The graph of the HR Diagram plots the stellar characteristics of ________ .
luminosity against surface temperature
The luminosity of a main sequence star has been observed to be proportional to ________ .
the 3 1/2 power of the mass of the star expressed in solar mass units
Stars A & B have the same surface temperature. The radius of A is 100 times B. Star A is ________ .
10,000 times more luminous than B
The surface area of a sphere is proportional to ________ .
the radius squared
What is the Spectral Type and Luminosity Class of our Sun?
Before fusion starts in a proto-star, the energy for the object to emit light is derived from ________ .
heat energy created from gravitational collapse
A proto-star becomes a star when ________ .
it begins fusing Hydrogen in its core
Where are T-Tauri stars found on the HR Diagram?
T-Tauri stars can be found just above the Main Sequence line in the vicinity of our Sun.
Why is there an upper limit to the mass of a forming proto-star?
radiation pressure from within the proto-star dissipates the gas cloud
The Carbon-Nitrogen-Oxygen cycle of fusion ________ .
is still considered Hydrogen fusion
Although other molecules may be present in GMCs, these clouds get their name from the presence of ________ .
Hydrogen cold enough to form molecular Hydrogen
Single star systems make up ________ .
more than half of all the star systems in the Milky Way
The most important use of data collected about binary stars is ________ .
the calculation of the masses of stars
Only about ________ percent of binary stars have their orbits oriented in such a way that they could be observed as Eclipsing Binary stars.
Binary star systems are required for stars that end their lives as ________ .
Type Ia Supernovae
Neutron Stars and Black Holes, in general do not emit, yet they may be inferred in double star systems if ________ .
the evolved remnant has matter accreting in a very hot disk around it
he evolved remnant has matter accreting in a very hot disk around it
matter falls onto an accretion disk around the evolved compact remnant
THIS SET IS OFTEN IN FOLDERS WITH...
Stars & Galaxies Unit 1
Stars and Galaxies Exam 3
Stars and Galaxies Exam 2
Stars and Galaxies Exam 1
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