From: clidman (clidman@eso.org)
Date: Sun Apr 21 2002 - 13:08:36 PDT
Dear Ariel,
I cannot answer this question fully until Tuesday since my PC in
Santiago is currently unreachable and Tuesday is the day I come down
from Paranal. At any rate, I would advocate that
Loiret be re-observed with NIRI on Gemini if it were observed with
NIRI last time. The reason for this is that the J band filter varies a lot
from instrument to instrument. This is speacially the case for
ISAAC/NIRI, becasue we use Js for ISAAC and J for NIRI.
Cheers, Chris.
Ariel Goobar wrote:
> Hi,
> to know how to proceed with Loiret, i.e. whether to try and
> get a final ref in J or not (either with ISAAC or NIRI), it would be
> necessary to assess the S/N of last years' ISAAC image. As the host and
> the SN are about the same brightness in I they are probably also
> very comparable in J. That would imply that in last year's
> ISAAC observations ~50% of the signal came from the host and
> conversely, we would need to have exposure lengths that would
> allow us to measure something 1/2 as bright this time. Do you have
> any numbers on this Chris?
>
> Cheers,
> Ariel
>
> On Sat, 20 Apr 2002 raux@in2p3.fr wrote:
>
> >
> > I calculated the magnitude of the host of Loiret to be :
> >
> > 24.6 in I band.
> >
> > This was done using all the images from this spring.
> >
> > Cheers,
> >
> > Julien
> >
> >
>
> --
> ___________________________________________________________________
> Ariel Goobar (ariel@physto.se)
> FYSIKUM, Stockholm University
> Stockholm Center for Physics, Astronomy & Biotechnology
> tel: +46 8 55378659
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