The Lives Of Stars Flashcards
Relationship between M & O Stars and their Mass, Temperature, Luminosity, and Radius.
All increase from M to O Stars.
What are stars named after? Why?
The Main Sequence & Size. This is because of the Stefan-Bottzman Law.
What are the types of stars we mostly see in the sky?
Giants!
What are the most common class of star?
M Stars. (Coolest dwarf type of hydrogen burning star)
Where are Stars Born?
In Nebulae (clouds of dust and gas)
When the Nebulae collapse, many stars are formed. These stars warm the Nebula, exposing a stellar cluster.
When are Stars considered born? How does this correlate to the Main Sequence?
When they start fusing Hydrogen in their core.
All Main Sequence stars are classified by their Hydrogen burning core. Therefore, ALL newborn stars are born on the main sequence.
Are Main Sequence Stars stable?
Yes, their pressure balances gravity evenly.
What is the most important quality of a star? Why?
The Mass !
The mass determined the location of Star along the Main Sequence.
Mass is Density !!
What happens when a star runs out of Hydrogen in its core?
The fusion will stop, causing temperature and pressure to decrease.
Then, gravity will star making things tighter, decreasing volume which will ultimately increase temperature and pressure again.
This causes shell around the core to get hot and mass will be underneath the shell.
When does the Star turn into a Red Giant?
When it has helium fusion and shell burning.
What happens when a star runs out of Helium in its core?
Becomes a Double-Shell Burning Star ! (Asymptotic Giant Branch Stars) These are stars lying on the horizontal branch on the Red Giant Branch of the HR Diagram.
One shell is Hydrogen burning whereas the other is Helium burning.
What two properties do stars in a cluster share?
Age and Approximate Distance from Earth
Rate of Burn vs. Type of Star
Massive Stars (O, B, & A Stars):
Fast Burn!
“Average Star” (G Stars)
Average Burn.
Low-Mass Stars (M Stars)
Slow Burn!
