| 1. | The energy source of PMS objects is hydrogen burning in main-sequence stars.
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| 2. | The hydrogen burning on the white dwarf ended two years later, in 1994.
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| 3. | Hydrogen burning now takes place in a narrow shell surrounding the newly processed helium core.
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| 4. | The inner core contracted until hydrogen burning commenced in a shell surrounding the helium core.
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| 5. | It may still be hydrogen burning main sequence star.
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| 6. | It is a core helium burning star while the O type companion is still a core hydrogen burning star.
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| 7. | In particular, during their hydrogen burning period, stars lie along a curve in the diagram called the main sequence.
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| 8. | :Water is made of hydrogen and oxygen because it is the result of hydrogen burning in an oxygen rich environment.
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| 9. | It is roughly 23 % of the way through its lifetime on the main sequence of core hydrogen burning stars.
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| 10. | The fact that lithium is still detectable indicates that little if any hydrogen burning is taking place inside the object.
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