Re: Few results from disk sets 17 and 18

[Jure Skvarc <jure.skvarc@ijs.si>]

Tom and all

Tom Droege wrote:
> 
> Jure,
> 
> Thanks very much for the nice data.  I would be interested in a plot of
> mean sigma vs magnitude.  It is hard to estimate this from the log scatter
> plot.  

This and some other additions are in the revised page.

>I printed out a few stars.  There are three extra columns that are
> not in your list.  An eight digit number followed by numbers similar to the
> magnitude and the sigma.  What are these?
> 
They are: index to the master file, followed by the magnitude and sigma of
measurements excluding the largest and smallest value (to eliminate outliers).

> I notice that we have 40 -50 measurements for most stars.
> 
> You go to nearly mag 15 on the plot, this seems to be well down into the
> noise for this data??
> 
Most of the mag 14 and above stars have only one measurement or few at most. 
This data is useless from the photometric point of view.


A summary of changes on http://node.239-0.ty.link.si/~jure/tassdisk1718.html:

new graphs, also excluding data from the disk 18f.
Calibration data at http://node.239-0.ty.link.si/~jure/calibrations.html
A hint to a method to recognize bad data at
"http://node.239-0.ty.link.si/~jure/calibrations.html#bad data".


		Jure