(cba:news) CI Aquilae in particular
jop at astro.columbia.edu
Wed Jul 7 23:13:44 EDT 2021
I just wanted to push CI Aquilae a little extra hard. As you know, it's
a recurrent nova, and the only RN which can answer the question: is the
great oddity of T Pyx/IM Nor (Mv, dP/dt) due to the short P_orb, or due
to some other effect special to RNe (e.g. extreme and frequent heating
of the donor). The really long-P_orb RNe are not appropriate for such a
test, because giant stars will be heated much less strongly - i.e. their
properties are probably determined by the whims of the donor, not any
It's an equatorial star well-placed for everyone. The only catch is
that you absolutely need a long run - at least 5 hours if possible.
P_orb = 15 hours, so define the orbital wave, you need some decent
fraction of that. Maybe 4 hours is OK. That will often yield a pretty
boring light curve... but with other longitudes pitching in, it'll be
July-August is totally the season for novae! Southern guys of course,
because of the rich pickings in Sco-Sgr... but also some in the north or
equatorial (V1974 Cyg, V1494 Aql, CI Aql, others). As usual, it's
best to pick a program star and beat on it faithfully for a few weeks.
That's what makes these campaigns scientifically impactful.
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