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10 Cards in this Set
- Front
- Back
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Compared to the sun most nearby stars are... |
...Less luminous and smaller |
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Compared to a star with mass equal to the mass of the sun, a main sequence star of 10 solar masses is... |
...hotter and more luminous. |
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What is plotted on an H-R diagram? |
Luminosity versus surface temperature |
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Compared to a main sequence star of type O, a main sequence star of type K is... |
...Cooler and less massive |
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True or False:
Star A appears brighter than Star B as seen from Earth. Therefore, Star A must be closer to Earth than Star B. |
False |
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From a distance of 1 parsec, the angular size of Earth's orbit would be... |
2 arc seconds |
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Stars of spectral class M do not show strong lines of hydrogen in their spectra because... |
...Their surfaces are so cool that most hydrogen is in the ground state. |
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Stars with cool surfaces can be very luminous if they are what? |
Large |
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The mass of a star may be determined.. |
...only if it is in a binary system. |
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True or False: |
False |
