Re: Analyzing Data

[Patrick Wils <patrickwils@yahoo.com>]

--- Tom Droege <tdroege2@earthlink.net> wrote:
> Here are three files to try out better search techniques.  I recall
> they 
> had WS statistics of 2.5, 2.0, and 1.2.
> 
> They all look like they are short term variables to me.  a814 seems
> the 
> most questionable yet had the highest ws number.
> 
> I am hoping that one of you (Patrick?) will provide us with software
> that 
> will dig stars such as this out of the crud.
> 


For star 814 there are simply not enough observations (12 only).  The
relatively high WS statistic is due to the two fainter observations at
the end.  Removing those reduces WS to 1.1.  In this case, WS (and
probably all other indicators as well) is not very reliable.

The two other stars show a clear trend (they also have a high Spearman
RCC), but there should be some confirmation of this on other nights.  I
think the "cost" of observing a single star like this in detail with a
telescope is too high (there are not that many active
telescope/observer combinations!).  There are other stars which look
more promising for detailed study at this time.  In my opinion,
"confirmation" should first come from surveys like TASS which can deal
with a large number of stars simultaneously.

Besides that, if I get to adapt the WS script to include other
variability indicators in a satisfactory way, I will certainly send it
to the list.  If the number of available observations for each star
were, say, doubled, the task to identify variables would be a lot
easier.

Patrick



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