MISTRAL ETC spectro

MISTRAL ETC spectro MISTRAL ETC Spectro

We give in the following the parameter ranges we tested. Values outside of these ranges will give a predicted exposure time (except for unphysical airmasses), but we suggest to carefully look at the 3D plots, as this exposure time may be affected by model divergences.

Moon conditions *

OHP seeing is typically varying between 1arcsec (not very often), and 5arcsec, with a median value close to 2.5arcsec.

Seeing *

Object type *

Object (modeled by a gaussian) apparent fwhm (arcsec). Only used if extended object

Object apparent fwhm

Targetted magnitude (V band, Vega system). Values below 0 are too bright for T193/MISTRAL. Values below 2 are difficult because camera shutter may have difficulties to follow such bright objects without saturation (minimal exposure time is ~0.5sec). Values above 21 are in unexplored domains, exposure times may be wrong. Such values are anyway too faint for T193/MISTRAL.

Magnitude you want to reach? *

Gives the Air Mass (>1). Values above 2 are in unexplored domains, exposure times may be wrong (and telescope broken...).

Air Mass *

Do you want an additionnal extinction? Give a magnitude (>0.)

Gives the required S/N (between 3 and 25). Values below 3 and upper 25 are in unexplored domains, exposure times may be wrong.

S/N *

Spectrum type (absorption or emission) *

Dispersor (blue or red) *