Preparation of a run using the TIGER Mode


    EXPOSURE SIMULATOR


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First, select the OASIS SPECTROGRAPH PARAMETERS you plan to use :

Spatial sampling and field :
Spectral configuration :


Do you PLAN TO OBSERVE :

a star-like object (star, star cluster, ...) ,    or an extended object (galaxy, nebula, ...) ?

For a star-like object, what is the image quality expected at OASIS input ?    arcsecond

What is the magnitude      B   V   R   I,    or flux 10-   W m-2  ?
          (Å-1 for continuum, arcsec-2 for an extended object)

Is the flux dominated by continuum emission
or line emission  of rest lambda : Å,  rest FWHM : Å,  redshifted to Z =   ?

For LR610 and continuum only : lambda of interest ?   Å


Give the OBSERVATIONAL PARAMETERS :

Exposure zenithal distance (deg.) Moon zenithal distance (deg.)
Moon phase,
from 0 (new) to 1 (full) 		Moon distance
(deg.) from the object
Signal-to-noise ratio
to be achieved 		Exposure time
(seconds)
Atmospheric dispersion compensator :              ON        or       OFF    (sometimes unwise, see manual)


OPTIONAL PARAMETERS :   


And now COMPUTE the :
Exposure time needed
to reach the requested S/N ratio
with the given object flux 		Expected S/N ratio
in the given exposure time
with the given object flux 		Minimum object flux
to get the requested S/N ratio
in the given exposure time


Back to OASIS home page. Get some HELP about this simulator. Last update: 5 March 2005.
Contact : A. Pecontal