(cba:news) YZ Cnc and the campaign
jop at astro.columbia.edu
Wed Jan 25 11:03:20 EST 2017
They decided *not* to trigger the X-ray observation on the YZ Cnc
outburst a few days ago. All the pieces weren't quite in place. Good
chance on the next one though, possibly 4-8 days away (very roughly).
So keep up the long time series. Two other things that would be helpful:
(1) Post to cba-chat as well as cba-data. That way, everybody gets it,
and can study your data in conjunction with their own to form a judgment
as to when the outburst is "beginning".
(2) If you're able to cover the star quite a bit, compare your data with
that already in the AAVSO archive to make a guess about this. Let us
know your guess (through cba-chat); it's of much more value than those
of us who, like me, just read emails!
(3) It's probably best if you submit actual magnitudes rather than just
delta-magnitudes. About half of CBAers customarily use
delta-magnitudes, since they're, strictly speaking, more accurate. But
your magnitudes will be more *useful* if you add the magnitude of the
comp star, or some known comp star. And if you are very familiar with
the field and have some particular comp star you favor, let us all know.
I think Enrique uses the AAVSO 137 star (V = 13.688).
That's true in general, also - that your estimate of actual magnitude,
not delta-mag, is more useful. In the time-series analysis, I usually
subtract the mean anyway, so it doesn't corrupt anything - and it shows
at a glance, though admittedly roughly, whether the star is in a "high"
or "low" state. V_comp + delta-mag is usually the best way to go.
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