Re: A Question About Mark III Data

["Michael Gutzwiller" <deepsky@fuse.net>]

Hmmm.  I just looked at a bunch of the correction terms for the Mark III
files I processed.  The correction adjustments are certainly not a simple
linear function.  In most cases they are somewhat quadratic with the center
stars needing darkening and the stars at the beginning and end of the line
needing brightening.

But in almost every case the correction term at the end of the line
brightened the stars much more than than those at the beginning of the line.
In fact a case could be made that there was an average loss of about 0.1
magnitudes from the beginning of the line to the end.

Mike G.

----- Original Message -----
From: "Tom Droege" <droege@wwa.com>
To: <tass@listserv.wwa.com>
Sent: Wednesday, December 29, 1999 5:43 PM
Subject: A Question About Mark III Data


> We have lots of Mark III data.  A Question:
>
> Does the Mark III data show a systematic error across the line?  If there
> is a charge transfer efficiency problem, then the stars at the far end of
a
> line should be consistently dimmer with respect to reference stars than
> those at the beginning of a line.
>
> What say Mike?
>
> Tom Droege