Formed when an AGB star's gravity can't hold onto its outer layers.
What is a planetary nebula?
100
In a binary pair, the star that evolves to a white dwarf first.
What is the more massive star?
100
The reason stars leave the main sequence.
What is hydrogen is used up in the core?
100
This happens to the light from a star when it expands and contracts on the instability strip.
What is pulsate?
200
The remains of an AGB star after its outer layers are ejected to a planetary nebula.
What is the core (white dwarf)?
200
The quick burn of a layer of hydrogen on a white dwarf, collected from a giant companion.
What is a nova?
200
This stays the same as a high-mass star expands and cools after leaving the main sequence.
What is luminosity?
200
The cause of size changes in supergiants.
What is fuel changes?
When fusion shells are created, temp and luminosity can get out of balance in the star, causing stars temp and size to change, moving back and forth on HR through instability strip.
300
What white dwarfs are made of.
What is electron degenerate carbon?
White dwarfs are supported by electron degeneracy pressure.
300
Collapse, burning, and explosion of a white dwarf pushed over the Chandrasekhar limit by a giant companion.
What is a Type Ia Supernova?
300
Direction high mass stars move on the HR diagram after leaving the main sequence?
What is right?
300
High-mass supergiants in instability strip.
What are Cepheid variables?
400
Direction WD moves on HR as it cools
What is down and right?
400
A luminous event between a white dwarf and red giant that can reoccur multiple times in the same system.
What is a nova?
400
Type of fusion occurring in the core of supergiants when they first leave the main sequence.
What is helium fusion?
400
This indicates a variable star has a high luminosity, according to the period-luminosity relationship.
What is long period?
500
A cold, non-radiating white dwarf.
What is black dwarf?
500
Two possible outcomes of a low-mass binary star system.
What are 2 white dwarfs or a Type 1a Supernova and a white dwarf?
500
A new one is added every time a new element begins fusing in the core of a supergiant.
What is a fusion shell?
Supergiants can have many different types of fusion shells.
500
Property of standard candles that allows astronomers to know their distance.