The chronological steps that lead to the observed nova event are as follows:
- Material accumulates onto the white dwarf star's surface, making its temperature and density increase.
- Accumulated surface hydrogen begins nuclear fusion at 10 million Kelvin.
- The reactions from nuclear fusion cause a temporary yet significant increase in luminosity.
- As nuclear fuel is either burned up or blown into space, nuclear fusion ceases and the star dims down.
A nova event is an astronomical event that causes the occurrence of a bright star that slowly fades over time (usually in weeks or months). It's mainly caused by white dwarf stars that are involved in a close binary system.
Attached below is an image of the Nova Eridani in 2009 taken by Kevin Heider.
Your question seems incomplete, but the completed version is most likely as follows:
In a binary-star system that produces a nova, the white dwarf pulls matter from the companion star. The matter forms an accretion disk that orbits the white dwarf. Then a specific sequence of events must take place for a nova event to occur.
Rank the steps leading up to the observed nova event in chronological order from first to last.
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