[Aavso-photometry] Reality Check - Basic Concepts (Light Curve Values)

[Arne Henden]

The light curve generator doesn't have a separate color
or symbol for transformed vs. untransformed.  If you download
the actual data, the flag appears there.  The majority of most
submitted observations are still untransformed, but that is
slowly changing.  However, if the comparison stars are close
in color to the variable, transformation makes only a small
difference.  For bigger color difference, it depends on what
the variable does through its cycle as to how well one
observer compares with another.   Each star or project has
its own "limits" as to what is acceptable photometry - you can
have larger error with a 5-magnitude Mira than for a 6millimag
exoplanet transit.
Arne

On 6/15/07, David Trowbridge <David at tinyblue.com> wrote:
>
>
> In the WebObs application, there's a radio button for indicating whether the
> data being submitted have been transformed or not. So what are we looking at
> in the light curve: transformed data or untransformed? Are both types of
> observations appearing as green diamonds?
>
> > Consider the AAVSO light curve for V5558 Sgr (http://tinyurl.com/3bh74o)
> >
> >
> >
> > Question #1: In general, do the data points in this light curve represent
> > the results of observers who have been doing all-sky photometry and using
> > standards such as Landolt, M67, etc? Are the values in this graph exactly
> as
> > submitted by various observers, or have they been normalized in some way
> > after they were submitted?
> >
>
> David Trowbridge
>
>