quick astronomy question?

[Dmitriy]

4. A white dwarf in a closed binary system will explode as a supernova if it gains enough mass to exceed the ___
a. white dwarf limit (1.4Msun)
b. nova
c. electron degeneracy pressure
d. accreation disk
e. white dwarf supernova
f. massive star supernova

5. a ____ consists of hot swirling gas captured by a white dwarf (or neutron star or black hole) from a binary companion star
a. white dwarf limit (1.4Msun)
b. nova
c. electron degeneracy pressure
d. accreation disk
e. white dwarf supernova
f. massive star supernova

6. a ___ can occur only in a binary system and all such events are thought to have the same luminosity.
a. white dwarf limit (1.4Msun)
b. nova
c. electron degeneracy pressure
d. accreation disk
e. white dwarf supernova
f. massive star supernova

 

[Cirric]

Hi. 4) Both a and c are technically correct, but c yields a neutron star after the supernova.
5) d. 6) e.

 

[Zana]

4. EDP

5.white dwarf limit (1.4Msun)

6.nova