4.Constellation A. A grouping of stars (ex. Big Dipper) - named after animals, mythological...
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Transcript of 4.Constellation A. A grouping of stars (ex. Big Dipper) - named after animals, mythological...
![Page 1: 4.Constellation A. A grouping of stars (ex. Big Dipper) - named after animals, mythological creatures, and everyday objects.](https://reader036.fdocuments.us/reader036/viewer/2022062313/56649c735503460f949252ca/html5/thumbnails/1.jpg)
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4. Constellation
A. A grouping of stars (ex. Big Dipper) - named after animals, mythological
creatures, and everyday objects.
![Page 3: 4.Constellation A. A grouping of stars (ex. Big Dipper) - named after animals, mythological creatures, and everyday objects.](https://reader036.fdocuments.us/reader036/viewer/2022062313/56649c735503460f949252ca/html5/thumbnails/3.jpg)
4. Constellation - Today, there are 88.
- Some constellations you can see year-round, others only in specific seasons.
![Page 4: 4.Constellation A. A grouping of stars (ex. Big Dipper) - named after animals, mythological creatures, and everyday objects.](https://reader036.fdocuments.us/reader036/viewer/2022062313/56649c735503460f949252ca/html5/thumbnails/4.jpg)
Star Cluster- A group of stars that is gravitationally bound to each other- they interact with each other.
Binary Stars- two stars that orbit around a common center of mass, and are very close to each other.
![Page 5: 4.Constellation A. A grouping of stars (ex. Big Dipper) - named after animals, mythological creatures, and everyday objects.](https://reader036.fdocuments.us/reader036/viewer/2022062313/56649c735503460f949252ca/html5/thumbnails/5.jpg)
5. Stellar Distances
A. Light year - the distance light
travels in a year - (it has nothing to do with time). - It is 9,500,000,000,000 km. - Used to show distance to stars
![Page 6: 4.Constellation A. A grouping of stars (ex. Big Dipper) - named after animals, mythological creatures, and everyday objects.](https://reader036.fdocuments.us/reader036/viewer/2022062313/56649c735503460f949252ca/html5/thumbnails/6.jpg)
5. Stellar Distances –
B. Parallax - the METHOD used to determine the distance to stars. - The star appears to move because Earth is moving. - Scientists can look at the angle of apparent movement to determine how far away the star is.
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6. Star Color vs. Star Temperature
A. Hot Stars- stars that are 30,000 K or hotter are blue.
B. Medium Stars- stars in the middle range appear yellow.
C. Cool Stars- stars in the 4,000 K
or less range are red.
![Page 8: 4.Constellation A. A grouping of stars (ex. Big Dipper) - named after animals, mythological creatures, and everyday objects.](https://reader036.fdocuments.us/reader036/viewer/2022062313/56649c735503460f949252ca/html5/thumbnails/8.jpg)
6. Star Color vs. Star Temperature
![Page 9: 4.Constellation A. A grouping of stars (ex. Big Dipper) - named after animals, mythological creatures, and everyday objects.](https://reader036.fdocuments.us/reader036/viewer/2022062313/56649c735503460f949252ca/html5/thumbnails/9.jpg)
7. Hertzsprung-Russell Diagram
A. Y-axis is absolute magnitude
B. X-axis is the temperature of star
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7. Hertzsprung-Russell Diagram
C. Main Sequence Stars
- Stars on a curve that runs diagonally through the graph
- 90% of all stars are main sequence.
- Hot and bright stars to cool and dim stars
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![Page 12: 4.Constellation A. A grouping of stars (ex. Big Dipper) - named after animals, mythological creatures, and everyday objects.](https://reader036.fdocuments.us/reader036/viewer/2022062313/56649c735503460f949252ca/html5/thumbnails/12.jpg)
7. Hertzsprung-Russell Diagram
D. White Dwarf
- Small, dim, and hot
- Few are White Dwarfs
E. Red Giants
- Large, bright and cool
- Few are Red Giants
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![Page 14: 4.Constellation A. A grouping of stars (ex. Big Dipper) - named after animals, mythological creatures, and everyday objects.](https://reader036.fdocuments.us/reader036/viewer/2022062313/56649c735503460f949252ca/html5/thumbnails/14.jpg)
7. Hertzsprung-Russell Diagram
F. Our sun is average in size and temperature (main sequence star)
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Star Composition
Most stars are about 73% hydrogen and 25% helium!!