(cba:news) V1674 Her... once more with feeling!
jop at astro.columbia.edu
Fri Apr 8 06:53:17 EDT 2022
recent ATel suggests that V1674 Her has "returned to quiescence". I'm
not sure exactly what the authors meant by this... maybe simply that the
spectrum now resembles a CV rather than a nova. But all of our data
shows that it's still 3 magnitudes above quiescence, and exhibiting the
same periodic phenomena which characterized the eruptive state (3.5
hours and 8 minutes). In particular, the pulsation period continues to
speed up, as it did throughout 2021.
There's a lot of physics in that change of pulse period. And it's all
NEW physics. Never before have we had a star with known pulse period
*before* eruption, known pulse period ~10 days after eruption, and then
continuously known dP/dt for the next 300 days (and counting).
Maybe when we have 10 TESSs and ZTFs, such things will be routine. But
it's all terra incognita now, and I earnestly hope you guys keep the
time series coming! It gets 4 minutes better every day... but even now,
Hercules is well up in the morning sky.
We are just getting started on this amazing star... and I bet others
are, too. In the history of novae, I think it will take a high place in
the pantheon, alongside DQ Her, T Pyx, and V1500 Cyg.
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