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Filter & chip spectral-response curves for La Palma

by Chris Benn and Deanna Cooper

This Appendix contains spectral-response curves for RCA SID501EX and GEC P8603 UV coated CCD chips, for KPNO B, V, R and I filters, for La Palma broad-band glass U, B, V, R, I and Z filters and for the 20 filter chip responses. Note that the vertical scalings differ.

The filter data were taken from La Palma Technical Note 37 (see also Appendix F).

Digitised versions of the response curves illustrated here may be found in directory U1:[CRB.FILT] on the Starlink VAX, in both Starlink and ASCII formats (.BDF and .LIS files). ASPIC programs read the former. To convert from one to the other, use ASPIC XYEDIT. The files are named according to the following convention:

20mm CCD_ chip = CCD responses

KP f, LP f = filter responses

KP f_ chip, LP f_ chip = filter CCD responses

0mm where f is a filter (e.g. ``V'') and chip is either ``RCA'' or ``GEC''. ``KP'' refers to the KPNO filters, ``LP'' to the broad-band glass filters constructed at RGO.

Approximate integration times and signal-to-noise ratios as a function of telescope aperture, magnitude, seeing etc., for U, B, V, R, I and Z filter chip responses, may be calculated using program CCDSN (which runs on the BBC micro.).

There is also a program (COLMAGZ) available for convolving response curves with spectral-energy distributions (as functions of redshift and if required), for calculating colours, colour equations etc.