(cba:news) OV Boo's ripping, awesome, groovy, out-of-the-blue outburst
jop at astro.columbia.edu
Fri Apr 28 03:55:54 EDT 2017
Best strategy here is to increase exposure time, *gradually* as the star
gets fainter. Unfortunately for us small-scopers, the brightness at
mid-eclipse does matter quite a bit - because it reveals how much light
is down there right at the white dwarf (the WD itself and inner disk).
So absence of points at mid-eclipse is a problem.
But time resolution is a somewhat bigger problem. Everything happens
fast with this star, so we have to keep integrations short.
The star is still 2 mag above minimum light, and re-brightenings - even
second outbursts - are still possible. We must keep going on this
unique star (only known Pop II star among the ~1000 known CVs). S/N
around 10-15 is just fine. By superposing the various light curves
("crowdsourcing") we're managing to get excellent data from these
various runs at S/N~15... and at least delineating the walls of the
We also have occasional opportunities for pot-shots with 1-meter
telescopes, later in May and June. Mainly through John Thorstensen and
Matt Wood. Let's stay good buddies with this star!
I'll present results-to-date at the SAS/AAVSO meeting (Ontario,
California) in mid-June, and hope to see a bunch of you there!
On 4/27/2017 8:01 PM, Shawn Dvorak wrote:
> I got fairly good data last night, but it's getting a bit faint for
> high(ish) cadence observations. I ran with 45 sec exposures with a clear
> filter, and I was missing the lower parts of the eclipse - it's getting
> down around 18.5 now. I'll have to increase exposure time, or move on to
> other objects until/if a rebrightening occurs.
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