White Dwarf + Hydrogen Gas: Can It Revive Fusion?

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SUMMARY

The discussion centers on the potential for a white dwarf to revive nuclear fusion by accreting hydrogen gas from its surroundings. It highlights the phenomenon where a white dwarf can gather material from a hydrogen-rich environment, similar to cases observed with red giant companions. The consensus is that while this process may lead to increased activity, it ultimately results in a supernova once a critical mass is reached. The concept of "zombie" stars, which may exhibit unusual characteristics due to this accretion, is also explored.

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  • Understanding of white dwarf stars and their characteristics
  • Knowledge of nuclear fusion processes in stellar environments
  • Familiarity with supernova mechanisms and classifications
  • Concept of mass accretion in astrophysical contexts
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  • Research the process of mass accretion in white dwarfs
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  • Investigate the concept of "zombie" stars and their implications in astrophysics
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Astronomers, astrophysics students, and anyone interested in stellar evolution and the dynamics of white dwarfs and supernovae.

El Nexus
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I've been thinking about what might happen if a white dwarf came across a fresh source of hydrogen. Suppose a white dwarf were to enter a cloud of hydrogen gas like the ones that stars are born from. Could it scoop up enough material for nuclear fusion to start again? Is there any evidence for such "zombie" stars (maybe some that are heavier and denser than they have any real business being)?
 
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Most likely it would accrete the material until it reached the point where it would go supernova. Similar phenomenum has been described, where a white dwarf has a red giant as a companion and swallows material from the giant.
 
mathman said:
Most likely it would accrete the material until it reached the point where it would go supernova. Similar phenomenum has been described, where a white dwarf has a red giant as a companion and swallows material from the giant.

that a plain old nova no thing super about it
just a star flaring up, not blowing up
in the giant as a companion case it is a repeteable case
unlike a true supernova that is one time only
 

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