Record Nova Flares Over a Single Day - Here's Astroguyz on the strange tale of Nova Herculis 2021 -
Novae are produced when a dense white dwarf star siphons material off a main sequence companion. The material becomes compressed on the surface of the white dwarf, which can then ignite under the pressure of nuclear fusion in a violent flash. Novae can erupt multiple times, in what’s known as a recurrent nova. Novae can also build up and evolve over time into supernovae, which can be seen across the Universe.
Nova are vital as they seed heavier elements back into the cosmos, and Type IA supernovae are used as standard candles to measure extra-galactic distances. “We are continuing to observe this system since it has not returned to quiescence,” says Starrfield. “We know that it has a ~500 second oscillation—presumably the white dwarf rotation period—and an about 3.6 hour rotation period that is probably the rotation period of the binary. We need more spectroscopy and photometry to better understand those periods and the implications of those periods.”
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