(cba:news) V1101 Aql mostly
jop at astro.columbia.edu
Wed Aug 28 21:38:51 EDT 2013
V1101 Aql continues to amaze, with its startlingly coherent 3.9 hour and
16 day periodicities... and at such high amplitude! The smart money
(sorry, gambler's slang) still says this is a negative superhump, but
there's a not-small chance that it's something more exotic. Maybe
unprecedented. I don't know any star like this.
And CBAers have really been working overtime: Joe U, Enrique, David
Cejudo, Jim Jones, Doug Slauson, Richard Sabo, Mike Potter, George
Roberts, Tut Campbell, Ken Menzies, Michael Cook, Marlin Costello, Greg
Bolt, Gordon Myers. Wow! And we now have a beautiful 44-day light
curve, sufficiently regular to specify all the main periods (though not
necessarily with enough wisdom to *interpret* them). So let's
experiment a little.
The star is bright enough, and the signals strong enough, to survive
filtration. If you have broadband filters (1000 A-ish, like the Johnson
filters), then consider taking the time series in filtered light. You
could choose a single-filter time series, e.g. V or I, or interleave
them (V, I, V, I, etc.) While the strategy is basically exploratory,
what I'm wondering is whether the alleged "superhump" is really a
signature of a strongly magnetic WD, which are also commonly signified
by a *very* red color (redder than any thermal process could reasonably
I don't think *most* people should do this. Maintaining our beautiful
44-day light curve for a few more weeks is mighty important. But if
some people observe in filtered light, there would be new information,
and a test of my hypothesis (or at least the version of it invoking
cyclotron radiation). Meanwhile, keep the faith on the star.
BTW watch out for the nearby intruder stars, in this somewhat crowded
field. They could *really* louse up colors.
In the far south, the campaigns on BW Scl, NR TrA, and CD Ind continue,
an the stars are definitely cooperating. Details in the next 1-2 days.
And I still *crave* light curves of V1494 Aql! Kind of an orphan in
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