[vsnet-chat 7550] Re: variable in OTJ16... field?

[David Boyd]

I've measured GSC 967 944 (V= 13.36) and GSC 967 756 (V=14.10) which are both 
between 2 and 3 arcmin from GSC 967 904 in the direction of the brighter star 
John mentions. These have SDs of 0.007 and 0.009 respectively over a 3.2 hr run. 
Over the same run GSC 967 904 had a SD of 0.033.

Regards,
David


----- Original Message ----- 
From: <substellar at Safe-mail.net>
To: <novak at hvezdarna.cz>
Cc: <drsboyd at dsl.pipex.com>; <vsnet-chat at ooruri.kusastro.kyoto-u.ac.jp>
Sent: Monday, July 12, 2010 12:49 PM
Subject: Re: [vsnet-chat 7548] Re: variable in OTJ16... field?


> If it was affecting the background signal then one of the other 14th magnitude 
> stars lying between it and GSC 967 904, and there are a few, would also be 
> displaying the same signal as GSC 967 904, and it wouldn't be due to 
> interference from GSC 967 904.
>
> This is probably somewhat over the top extra caution, but with low amplitude 
> stuff a simple means of checking for integrity of signal is to check that 
> neighbouring similar field stars are constant or whether they also have this 
> signal.  If you have a low amplitude signal you are not sure about, check to 
> see if the nearest twin also carries the same signal.