Re: re longer period variables

[Tom Droege <tdroege2@earthlink.net>]

I now have 8 successive days of observations where I just keep backing up 
to the stop and taking the next thing that comes over.  This leads to 4 or 
5 exposures of each star.  I have 70,000 or so stars with up to 5 
measurements of each over the 8 days.

There is good hunting for variables in this list, though there is still an 
Ic problem.  We get useful measurements to about 12.5.  I am finding about 
0.3% variables without looking very hard.  Most are relatively low 
amplitude, 0.1 to 0.05.  But they are pretty obvious none the less.  A few 
weeks more and I will start picking up longer periods.  But these are not 
much fun to go out and look at with a telescope.

Here are three in advance of the October list:

320.1764 +5.6952 NSV13663  tass V mag 11.5  Probably an eclipse 0.3 mag dip 
one evening's obs.
321.1661 +7.5295 Not Found   tass V mag 10.0   Varies 0.4 mag with no 
pattern obvious
344.6333 +5.8730 Not Found  tass V mag 12.0  Spikes brighten 0.5 mag.

Tom Droege



At 07:16 PM 9/12/02 +0100, you wrote:

>Hi Tom
>
>Just a general thought.
>
>I noticed Michael K. commented that the new variable from the "
>September" dataset was already getting too near the murk for him to
>comfortably follow it.
>
>I dunno what declination band you are doing in future, but for longer
>period variables than the putative 0.8 days of this one, if you want