Main-Sequence
What is the name of the classification system?
The OBAFGKM System (Morgan Keenan System)
Name the different types of stellar remnants
White dwarfs, neutron stars, and black holes
What does ISM stand for?
Interstellar Medium
Where in the stellar evolution cycle does the birth of a star occur?
In a giant molecular cloud (GMC)
Which star class has the hottest surface temperature?
O-type stars
What are white dwarfs made of?
Electron degenerate matter
What is the one object that is formed alongside a white dwarf?
Planetary nebula
What does the collapse of a GMC create?
A protostar
What are the most common types of stars in the universe?
Red dwarfs
What is the mass limit for a white dwarf? What is the mass limit for a neutron star?
1.4 Solar masses for white dwarfs, and 2.2 Solar masses for neutron stars
Where can you find ionized hydrogen?
Hll regions
Why doesn't a star collapse due to gravity?
Nuclear fusion creates radiation pressure that pushes outwards
What type of star is our Sun?
G-type main-sequence star
How massive must a star be to die in a supernova?
At least 8 Solar masses
What object do we use to map out the Milky Way galaxy using radio waves?
Hl regions
When does a main-sequence star (like our Sun) begin to transition to a red giant?
When it has used up all of the hydrogen in its core
What is the one color that a star cannot be?
Green
What type of supernova results from a white dwarf in a binary system stealing matter from its companion star?
Type la supernova
What is the average temperature of the ISM? What about molecular clouds?
1,000 - 10,000 Kelvin, but molecular clouds can be as cold as 10 K
What is the equation for the lifetime of a star?
T = 10^10 (MSun / M) ^2.5 yrs.