in the annex a spectrum detail of 5. Juli 2010 (S/N 250, Lhires III,
2400g/mm, C14 + reducer, 6x10 min exposure, flat corrigated) . The discussed
lines are not there in this night.
Some times ago I had problems with a spectrum of eps Aur, because I didn't
done a flat correction. So I had a "new line", but this was only the shadow
of a dust grain. The line resulting from it was deceptively genuine.
Could it be similar in your case?
----- Original Message -----
From: "Ernst Pollmann" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, July 06, 2010 11:36 AM
Subject: Re: delta Sco
yes I tried to do this, but the June spectra do have almost in all cases not
the signal-to-noise ratio, which would be necessary, to find the
"questionable" absorption lines without any doubt.
Attached again the comparison between 2010/06/26 and 2010/07/01 for
Currently, I have no doubt, that the lines in my spectra are real.
Particularly important before I began to take the spectra, has been the
temperatur stabilisation of the CCD and the dark frame compensation. I took
more than 1 hour for this.
In addition, the questionable lines in the sum spectrum are present in all
spectra of the series of the single spectra.