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H-R Diagram
Review of Vocabulary for H-R Diagram
| Term | Definition |
|---|---|
| Hertzsprung-Russell Diagram | A graphical tool that astronomers use to classify stars according to their luminosity, spectral type, color, temperature and evolutionary stage. |
| Luminosity | The intrinsic brightness of a celestial object |
| Main Sequence | A series of star types to which most stars belong, represented on a Hertzsprung–Russell diagram as a continuous band extending from the upper left (hot, bright stars) to the lower right (cool, dim stars). |
| Super Giant | A very large star that is even brighter than a giant, often despite being relatively cool. |
| Giant | A star having a diameter of from 10 to 100 times that of the sun, |
| White Dwarf | What a star like the Sun become after they have exhausted its nuclear fuel. Near the end of its nuclear burning stage |
| Red Dwarf | Low luminosity (say, not more than one tenth that of the sun), small mass (say, not more than three quarters that of the sun) and high density (perhaps 30–100 times the density of the sun). |
| Temperature | How hot or cold a star is measured in Kelvin |
| Apparent Magnitude | how bright the star appears from Earth |
| Spectral Class | The group in which a star is classified according to its spectrum, especially using the Harvard classification. |
| Brightness | apparent magnitude — how bright the star appears from Earth — and absolute magnitude — how bright the star appears at a standard distance of 32.6 light-years, or 10 parsecs. |
| Absolute Magnitude | How bright the star appears at a standard distance of 32.6 light-years, or 10 parsecs. |
Created by:
klstorie
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