From: Isobel Hook (ihook@gemini.edu)
Date: Sun Apr 21 2002 - 16:21:38 PDT
Chris,
Loiret/boccherini was observed with ISAAc. Only Satie was done with NIRI.
Isobel.
On Sun, 21 Apr 2002, clidman wrote:
> 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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