(cba:news) HZ Puppis and friends
jop at astro.columbia.edu
Mon Jan 13 13:11:56 EST 2014
We have found stable 21 minute oscillations in the light curve of the
old nova HZ Puppis (1963). This had been reported by Abbott and Shafter
a long time ago (1997), but never studied again or verified - even by
them. Abbott and Shafter are extraordinarily reliable observers... but
it was just a conference proceeding, and such things are usually
preliminary reports, which are followed by proper scientific papers. No
paper followed, by them or anyone else. And being a northern guy, there
wasn't a lot of chance for me to follow up. Then we did, a few days ago
- and there it was: beautiful 21 min oscillations, just as advertised.
So far our data is only from Kitt Peak, and we desperately need coverage
from other longitudes. With dec=-28 we can't stay on the star very
long, so aliasing is rather severe. This is all the more so because the
orbital signal is very weak in this star.
The star is around V=17.2. Easy for us with a 2.4 m, but the
oscillations are usually pretty strong, and our main reliance on
off-longitude data is alias rejection. So long runs at other longitudes
would be wonderful!
There's a lot of competition from other southern novae in the Jan-Feb
sky. Namely T Pyx, CP Pup, and V382 Vel. I *think* we're done with CP
Pup. It's the most mysterious and complex of all CV light curves I've
ever seen... and normally I'd be begging for more data. But I can't
imagine getting coverage any better than we had in 2012 and 2013 - so
for the moment, it's off the menu, and I have a big homework assignment.
T Pyx is definitely on the menu, and probably V382 Vel (though more on
that in a few days).
Let me know if you manage to obtain a good long time series on HZ Pup.
This will affect our priorities in the 2.4 m run, since alias-breaking
is aided by the *proximity* of data at different longitudes. Thanks!
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