Sun, 06/27/2021 - 14:58
Hi everyone,
I've been following the evolution of the nova V1405 Cas and am curious what may be causing it to rebrighten almost cyclically. I believe it's now on its third upswing. I'd be grateful for any help in understanding its behavior.
Thank you very much!
Bob (KRB)
A lot of references in VSX.
Bob,
I think V1405 Cas matches the J class novae in the classification scheme of Strope, Schaeffer, & Henden (2010). A similar case is V723 Cas (late 1995-1996). There are also O class novae which show regular oscillations but typically below the first maximum. V1391 Cas from last year is a bit like this.
I never saw a good physical explanation for the more or less regular ascillations. Is it due to more than one thermonuclear runaway or just thermal instabilities or anything else? If someone has seen more detailed explanations, I would be happy to learn.
I agree, and what about dust in the accretion disk, mainly if the plan of the disk is in our direction ?
Michel
Interesting paper by Erik Wischnewski <https://arxiv.org/abs/2111.02463?fbclid=IwAR1g_eEMO65Ar-XWD04OSoAV0iO8HhT9us_UUj6w11yPiF1JYB6gg53MYkQ>, analysing the global data set for N Cas 2021 and postulating that the unclassifiable behaviour of the nova might be down to the accretion flow.
Or there might simply be more than one white dwarf in the system?