[vsnet-chat 7339] Re: (cba:chat) BZ and GW!

[bmonard]

Re GW Lib: observed with CCD-V

Timeseries photometry were done at CBA Pretoria under windy conditions
during the later half of the night 13-14 April. Over a duration of 2.5h GW
Lib showed a gradual fading from 8.35 to 8.40V.

Observations done during the first half of the following night under partly
cloudy conditions showed GW Lib quite constant around 8.55V. What looks as
another fading episode towards the end of the run, might have been the start
of growing superhumps.
Then, the clouds took over....

Hopefully more luck tonight, but it doesn't look like it.


Note: I take the bright star East of GW Lib as C and assign 9.2V as its
brightness. This star is No1 in the Henden sequence which is stated to be
saturated.

Regards,

Berto Monard
CBA Pretoria

-----Original Message-----
From: cba-chat-bounces at cba.phys.columbia.edu
[mailto:cba-chat-bounces at cba.phys.columbia.edu]On Behalf Of Bob Koff
Sent: Sunday, April 15, 2007 3:43 AM
To: cba-chat at cba.phys.columbia.edu
Subject: Re: (cba:chat) BZ and GW!


Hello, All,

I should be able to start a run on BZ UMa around 02:30 UT.  I plan to
switch to GW Lib about 08:00 for a couple hours.  It will be a bit below
25 degrees, but I'll see what I can get.

BTW, note that there are Henden sequences available for both of these
stars, in addition to the AAVSO charts.

Bob Koff


Michael Koppelman wrote:
> From my run last night I get a period of P=0.0709 +/- 0.0005 days and
> a full-amplitude of 0.184 +/- 0.008. So it appears the amplitude is
> increasing. I had the average V mag at <V>=11.054 during my run.
> Magnitudes are with respect to the AAVSO chart.
>
> M.
>
>
> On Apr 14, 2007, at 5:16 PM, <Arto.Oksanen at tietoenator.com>
> <Arto.Oksanen at tietoenator.com> wrote:
>
>> BZ UMa is superhumping beautifully. Min-max amplitude is 0.3 mag and
>> maximum magnitude is V=10.8. Observation is ongoing.
>
>
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>


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