Term
| What is the appearance of a star shifting as Earth changes its position called? |
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Definition
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Term
| How many lightyears does one parsec equal? |
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Definition
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Term
| We can't use a parallex to measure up to more than how many parsecs? |
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Definition
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Term
| What is the continuous motion of stars due to their motion through the milky way known as? |
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Definition
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Term
| The more distant a light source is, does it appear brighter or fainter? |
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Definition
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Term
| How many times more brighter is Rigel than Betelguese? How many times further away is Rigel from Betelguese? |
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Definition
| 3.3 brighter, 1.6 times further |
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Term
| What is absolute magnitude? |
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Definition
| the magnitude of a star if it were 10 pc away |
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Term
| We can find a stars distance by comparing what two things?? |
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Definition
| absolute magnitude and apparent magnitude |
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Term
| Brightness increases with what? |
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Definition
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Term
| Are hotter stars brighter or fainter? |
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Definition
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Term
| What does the Hertzsprung-Russell diagram order the stars in a diagram of? |
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Definition
| luminosity vs. temperature |
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Term
| Where are most stars found in the H-R Diagram? |
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Definition
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Term
Where do cooler stars lie on the H-R diagram? hotter stars? brighter stars?
fainter stars? |
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Definition
cooler: right
hotter: left
brighter: top
fainter: bottom |
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Term
| Where do stars spend most of their active lifetime on the H-R diagram? |
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Definition
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Term
| on H-R Diagram, what does blue and red indicate? |
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Definition
| temperture. Red is cold, blue is hot |
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Term
| What lumonisty class do main sequence stars belong to? |
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Definition
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Term
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Definition
| pairs of stars that orbit their common center of mass |
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Term
| What is the center of mass known as? |
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Definition
| the balance point of the system |
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Term
| Does the center of mass shift towards the more or less massive star? |
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Definition
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Term
| What can we use the Doppler shifts to measure? |
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Definition
| the seperation of spectroscopic binaries |
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Term
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Definition
| measurement of radial velocities |
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Term
| What are binaries that have a double-dip light curve known as? |
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Definition
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Term
| When studying the light curve, when does the larger dip occur? |
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Definition
| when the cooler star moves behind the other |
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Term
| The higher a stars mass, the brighter or fainter it is? |
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Definition
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Term
| Do higher masses have shorter or longer lives? |
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Definition
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Term
| What are the most common stars? |
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Definition
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Term
| What groups are higher mass stars in? lower mass? |
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Definition
higher mass: OBA
lower mass: FGKM |
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Term
| What happens the parallex angle with stars that are farther away? |
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Definition
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Term
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Definition
| absolute brightness (intrinsic brightness); it's a measure of total power radiated from a star |
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Term
| What is apparent brightness? |
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Definition
| how bright a star appears from earth |
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Term
| What happens to the star if the magnitude is smaller? |
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Definition
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Term
| What are the five luminosity classes? |
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Definition
1a. Bright supergiants
1b. supergiants
2. Bright giants
3. Giants
4. Sub-giants
5. main-sequence stars |
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Term
| What characteristic of a star do you need to find in order to find luminosity, diameter, and mass? |
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Definition
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Term
| What can astronomers observe to measure the distance of nearer stars? |
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Definition
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Term
| What are stellar distances expressed in? |
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Definition
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Term
| What is the distance modulus related to? |
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Definition
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Term
| What two types of stars lie above the main sequence? why? |
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Definition
| giants and supergiants, because they're larger |
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Term
| What is one way to assign stars to luminosity classes? |
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Definition
| the widths of their spectral lines |
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Term
| What can be found in the orbits of visual binary system stars? |
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Definition
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Term
| What is the difference between a visual binary system and eclipsing binary system? |
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Definition
visual binary: visible seperately
eclipsing Binary: not visible seperatly |
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Term
| What two characteristics of stars can astronomers find through the eclipsing binary system? |
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Definition
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Term
| With the mass and diameter, what can you determine? |
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Definition
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Term
| What does the mass-luminosity relation rule state? |
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Definition
| the more massive a star, the more luminous it is |
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