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Radiation
Spectra
Spectral Classes / H-R
Stellar Evolution
Miscellaneous
100
Energy due to temperature
What is thermal radiation?
100
Type of spectrum that shows all the colors of the rainbow.
What is continuous?
100
Order of main sequence spectral classes from hottest to coolest.
What is O, B, A, F, G, K, M?
100
These are the clouds of dust and gas from which stars emerge (first stage).
What are nebulae?
100
When a star is moving towards Earth, its wavelength moves toward this end of the visible light spectrum.
What is blue or shorter wavelength?
200
The color that corresponds to lowest star temperature.
What is red?
200
Type of spectrum that shows when the electrons in stars' gases go from high to low energy (emitting photons).
What is emission?
200
These two characteristics of a star determine the elements present in it.
What are density and temperature?
200
The last stages of a star's life depends on this characteristic of the star.
What is its mass?
200
Most of the mass of our solar system can be found here.
What is in the sun?
300
Wien's law states that the peak wavelength a star emits is inversely proportional to this.
What is temperature?
300
Type of sepctrum that is dark lines on a rainbow background.
What is absorption?
300
This is the difference between apparent and absolute magnitude.
What is apparent is how the star looks from Earth and absolute is standardized (at 10 parsecs)?
300
Nuclear fusion begins at this stage of a star's development.
What is protostar?
300
The parallax angle of a star nearer to Earth compared to that of one far away.
What is wider (larger)?
400
The Stefan-Boltzmann law states that this is proportional to the temperature of the star to the fourth power.
What is energy (or brightness)?
400
He took the first photo of a spectrum.
Who is Draper?
400
Brightness of a star decreases as this increases according to the inverse square law.
What is distance?
400
The equation E=mc^2 has significance in stars because part of their mass is converted to this when fusion occurs.
What is energy?
400
This part of the sun takes heat from the inner layers to the outer layers.
What is the convection zone?
500
The term that describes a theoretical perfect radiator (emits all radiation that it absorbs).
What is blackbody?
500
How astronomers identify the elements present in a star.
What is comparing its spectrum to those of known elements?
500
On the H-R diagram, the main sequence stars generally increase absolute magnitude (brightness) as this increases.
What is temperature?
500
This is the longest-lasting stage for stars in which they are fusing hydrogen into helium.
What is main sequence?
500
Rapidly rotating neutron stars that give off radio waves are known as this.
What are pulsars?