CALDIV-Generate calibration spectrum from continuum standard spectra

Description:

Given a standard spectrum giving the continuum flux densities for each element for a particular standard star (probably generated by GSPIKE followed by INTERP) and the continuum of an observed spectrum of the same object, CALDIV calculates the instrumental response for each element. Note - this routine is intended for standards where the tables give the calculated continuum values at various points (e.g. Filippenko/ Greenstein standards), rather than the average measured flux density over a given wavelength range centered on each point. CALDIV will not accept a standard spectrum that has data in magnitude units.

Parameters:

STANDARD

A spectrum giving the actual continuum flux density at each point for a standard star. This will probably have been generated by GSPIKE followed BY INTERP. The data shoule not be in magnitude units.

SPECTRUM

An observed spectrum of the object whose tabulated fluxes were used to generate STANDARD. Note that CALDIV does not insist on the spectrum's having been scrunched, but things are usually easier if it has been. The wavelength range of SPECTRUM must match that of STANDARD exactly.

OUTPUT

A spectrum whose values give the instrumental response in "units per (counts per second per angstrom)", where "units" are the units used by the input standard spectrum.

Source comments:

 C A L D I V

 Divides the interpolated continuum spectrum of a standard
 star (e.g. a Filippenko/Greenstein standard, probably created
 by GSPIKE and INTERP) by the observed continuum of the same
 star, in order to generate the instrumental response calibration
 spectrum.

 Command parameters -

 STANDARD    (Character) The interpolated continuum spectrum of
             the standard star.  Note: This should not be in
             magnitude units, and should probably not contain a
             .TABLE.BANDWIDTH data object, since this would
             indicate that this was generated from published
             data giving average observed flux density over a
             wavelength range (e.g. Oke/Gunn data) rather than a
             fitted continuum.

 SPECTRUM    (Character) The observed continuum spectrum of the
             standard star.  Note that both STANDARD and SPECTRUM
             should be on the same wavelength scale (given by
             a .X.DATA array) and ideally this will be a linear
             scale.

 OUTPUT      (Character) The resulting calibration spectrum.

 Command keywords -  None

 User variables used -  None

                                    KS / CIT 28th May 1984