Quiz 3

If it were possible to observe stellar parallax from Neptune (far from the Sun), then the parallax angle of a nearby star would appear larger than when viewed from Earth.

True
False
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Terms in this set (10)
If it were possible to observe stellar parallax from Neptune (far from the Sun), then the parallax angle of a nearby star would appear larger than when viewed from Earth.

True
False
True
Two randomly selected stars turn out to have the same apparent brightness in the night sky. Which statement below must be true?

They have the same temperature.
The nearer one is hotter.
The farther one emits more energy.
They have the same distance.
The nearer one is larger.
The farther one emits more energy
The apparent magnitude of star A is m=0 and of star B is m=5. Thus, star A is approximately _______ than star B.

5 times brighter
5 times fainter
100 times brighter
100 times fainter
100 times brighter
Stars A and B have the same radius but Star A is twice as hot as Star B. What is true about their luminosities?

Star A and Star B have the same luminosity.
Star A has twice the luminosity of Star B
Star A has four times the luminosity of Star B
Star A has 16 times the luminosity of Star B
Star A has 16 times the luminosity of Star B
The spectral sequence OBAFGKM corresponds to a temperature sequence of hot to cool stars (from O to M types).
True
False
True
The spectral classification of the Sun, G2 V, indicates that the Sun is a ___ star.
supergiant
main sequence (or dwarf)
sub-giant
giant
Main sequence (or dwarf)
A star with spectral type O appears blue in color.
True
False
True
The GSU CHARA Array telescopes are the best for measuring the ____ of stars.
distances
spectral classifications
sizes (radii)
masses
sizes (radii)
To calculate the masses of stars in a binary system, we must measure their

absolute magnitudes and luminosities
spectral types and distance from Earth
orbital period and average orbital separation
luminosities and distance from Earth
orbital period and average orbital separation
In a spectroscopic binary system, when one star is approaching, the other star will be moving away.
True
False
True