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22 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Which of the spectral types of stars spends the least amount of time on the main sequence?
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B; Of the choices given, type B stars are the hottest, so they would burn up more quickly, spending the least amount of time on the main sequence.
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The process of accumulating material as described in the protoplanet hypothesis is called...?
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Accretion
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A huge cloud of gas and dust is called a...?
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Nebula
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What would you conclude if you looked through the eyepiece of a telescope and observed two stars within the field of view, one orange and one light blue?
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The blue one is hotter
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True or False: A star’s absolute magnitude is dependent on its distance from the observer.
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False; Absolute magnitude is a measure of the energy output of the star. This does not depend on distance from an observer. The apparent magnitude is a measure of how bright a star appears to an observer, and, therefore, would depend on distance.
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Star A is a first magnitude star. Star B is a sixth magnitude star. Which star is brighter and by how much?
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Star A is 100 times brighter than star B.
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The corpse of a low mass star is probably
A. a white dwarf B. a black hole C. a pulsar D. a neutron star |
A. A white dwarf
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True or False: Yellow stars, such as our sun, will one day explode in a supernova.
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False; Yellow stars do not have enough mass to contract and explode in a supernova.
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The total energy output of a star is called what?
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Luminosity
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True or False: A blue star on the main sequence will live a long time compared to our sun because it is so massive.
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False; Even though there is much more mass in a blue star, they burn much hotter and use up their hydrogen much faster than our sun would.
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True or False: In order for the distance to an object to be measured using parallax, it must be viewed from two different locations.
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True; Parallax can only be measured if there are two different observing locations.
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True or False:A very large star will undergo several supernova explosions in its lifetime.
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False; A star can only undergo one supernova in its lifetime. Recall that a supernova is an incredible explosion of a star.
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True or False:Higher mass stars live longer on the main sequence than low mass stars.
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False; Higher mass stars tend to burn much hotter and use up all of their nuclear fuel much faster than lower mass stars. Hence, they spend less time on the main sequence.
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True or False: Type A stars are hotter than Type O stars.
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False
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True or False: The Sun's energy source is nuclear fusion.
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True
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What is the name of the bright star in this constellation?
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Regulus.
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Constellation: Leo. |
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How many magnitude 3 stars does it take to get as much light as one magnitude 2 star?
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2.5; Recall that on the magnitude scale, a difference of five magnitudes corresponds to a factor of 100. So a difference of one magnitude corresponds to a factor of 2.5. It takes 2.5 magnitude 3 stars to equal the brightness of one magnitude 2 star.
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True or False: After the Sun leaves the main sequence, it will evolve into a red giant.
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True
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Which of the following is the correct order for spectral types of stars?
A.ABOFGKM B.OBAGKFM C.OBFAKGM D.OBAFGKM |
D. OBAFGKM;Remember the phrase "Oh, Be a Fine Girl (Guy), Kiss Me" to recall the correct order for spectral types (OBAFGKM).
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What is the name of this constellation?
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Leo.
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Three mechanisms of heat transfer are...?
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convection, conduction, and radiation
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How far away is a star whose parallax angle is 3/11 arc second?
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11/3 parsecs.
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