Term
| The star with twice the Sun's radius and the same surface temperature |
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Definition
| is four times more luminous than the Sun |
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Term
| The star with the surface temperature of 20,000K emits most of its power in |
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Definition
| the blue part of the spectrum |
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| The star with twice the Sun's surface temperature is |
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Definition
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Term
| The luminosity class of a star determines its |
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Definition
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Term
| The star of O5 spectral class ______ the star of F5 spectral class |
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Definition
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Definition
| luminosity class V (the Main sequence) |
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Definition
| more abundant that hotter stars and are less massive than hotter stars |
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Term
| Spectral classification is based on the star's |
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Definition
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Definition
| more massive and younger than less luminous stars |
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Term
| A star's spectral class defines |
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Definition
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Term
| To discriminate between a giant and a dwarf star of the same spectral class astronomers use |
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Definition
| the widths of absorption lines in their spectra |
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Term
| The Hertzsprung-Russell diagram uniquely describes |
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Definition
| the star's mass, the star's temperature, the star's color, and the star's radius |
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Term
| The star's luminosity depends on |
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Definition
| its mass, temperature, radius, and color |
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Term
| From measurements of the apparent and absolute stellar magnitudes astronomers can directly measure |
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Definition
| the star's distance to us |
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Term
| Trigonometric parallax defines |
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Definition
| the star's distance to Earth |
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Term
| Absolute stellar magnitude does NOT depend on the star’s |
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Definition
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Term
| A star of the apparent magnitude of m=5 is ___than the star of 6th apparent magnitude |
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Definition
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Term
| The hotter the star, the greater its |
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Definition
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Term
| The Main Sequence stars in the H-R diagram contribute |
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Definition
| over 90% of the total population in our Galaxy |
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Term
| A star’s color is uniquely characterized by its |
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Definition
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