Term
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Definition
| the distance to a star with a parallax of one second of arc |
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Term
| To an observer on the Earth, a star of apparent magnitude +1 appears ___ than a star of apparent magnitude +2 |
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Definition
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Term
| What is the difference between absolute and apparent magnitude of a star? |
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Definition
| Absolute magnitude is a fundamental property of the star which does not change, whereas apparent magnitude depends on its distance from Earth |
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Term
| In the constellation of Orion, the star Rigel has a distinct blue color and the star Betelgeuse has a strong red color. This means that |
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Definition
| Rigel is hotter then Betelgeuse |
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Term
| The luminosity of a star is |
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Definition
| its total energy output into all space |
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Term
| Which stellar class is the coolest? |
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Definition
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Term
| Cool stars can be luminous if they |
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Definition
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Term
| Most of the brightest stars in our sky are |
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Definition
| Hot F, B, and O stars or gaints |
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Term
| Most of the stars near the sun are |
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Definition
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Term
| Most stars in the galaxy are in spectral class |
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Definition
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Term
| The first reliable way to tell how far away a star is was |
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Definition
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Term
| You would expect that O, A and K stars would all |
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Definition
| be located on the main sequence |
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Term
| You would expect an O star to emit most of its radiation in the |
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Definition
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Term
| The mass of a star can be obtained most easily if the star is |
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Definition
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Term
| In this H-R diagram, stars with higher temperatures would be located |
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Definition
| at the left side of the graph |
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Term
| In this H-R diagram, dim, low-luminosity stars would be located |
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Definition
| at the bottom of the graph |
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Term
| In this H-R diagram, the mass of stars increases |
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Definition
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Term
| Where on this diagram would you expect to find most hydrogen-burning stars? |
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Definition
| in the shaded area between E and A |
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Term
| In which area would you find giant stars? |
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Definition
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Term
| In which area of the graph would you expect to find the Sun? |
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Definition
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Term
| In which area of the graph would you expect to find most stars in the galaxy? |
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Definition
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Term
| In which area of the graph would you expect to find the brightest stars in the night sky? |
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Definition
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Term
| You would find the shortest-lived adult stars in region |
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Definition
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Term
| You would find the longest-lived hydrogen-burning stars in region |
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Definition
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Term
| Stellar class describes a star's |
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Definition
| surface temperature and absorption spectra |
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