<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> <!--Converted with LaTeX2HTML 98.1p1 release (March 2nd, 1998) originally by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds * revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan * with significant contributions from: Jens Lippmann, Marek Rouchal, Martin Wilck and others --> <HTML> <HEAD> <TITLE>Flux Calibration</TITLE> <META NAME="description" CONTENT="Flux Calibration"> <META NAME="keywords" CONTENT="vol2"> <META NAME="resource-type" CONTENT="document"> <META NAME="distribution" CONTENT="global"> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"> <LINK REL="STYLESHEET" HREF="vol2.css"> <LINK REL="next" HREF="node136.html"> <LINK REL="previous" HREF="node132.html"> <LINK REL="up" HREF="node120.html"> <LINK REL="next" HREF="node134.html"> </HEAD> <BODY > <!--Navigation Panel--> <A NAME="tex2html3102" HREF="node134.html"> <IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="icons.gif/next_motif.gif"></A> <A NAME="tex2html3099" HREF="node120.html"> <IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="icons.gif/up_motif.gif"></A> <A NAME="tex2html3093" HREF="node132.html"> <IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="icons.gif/previous_motif.gif"></A> <A NAME="tex2html3101" HREF="node1.html"> <IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="icons.gif/contents_motif.gif"></A> <BR> <B> Next:</B> <A NAME="tex2html3103" HREF="node134.html">Flux Calibration and Extinction</A> <B> Up:</B> <A NAME="tex2html3100" HREF="node120.html">Long-Slit and 1D Spectra</A> <B> Previous:</B> <A NAME="tex2html3094" HREF="node132.html">Sky Subtraction</A> <BR> <BR> <!--End of Navigation Panel--> <H1><A NAME="SECTION001050000000000000000"> Flux Calibration</A> </H1> <P> The commands <TT>EXTINCT/LONG</TT> followed by <TT>RESPONSE/FILTER</TT> or by <TT>INTEGRATE/LONG</TT> and <TT>RESPONSE/LONG</TT> permit a one-dimensional response curve <TT>response.bdf</TT> to be obtained from the extracted (<I>e.g.</I>, via <TT>EXTRACT/LONG</TT> or <TT>EXTRACT/AVERAGE</TT>) and wavelength calibrated spectrum of a standard star. <P> The command <TT>RESPONSE/FILTER</TT> divides the standard star spectrum by the flux table values and uses median and smooth filterings (parameters <TT>FILTMED</TT> and <TT>FILTSMO</TT>) to smooth the instrumental response function. <P> The command <TT>INTEGRATE/LONG</TT> also performs a division of the standard star spectrum by the flux table but generates an table of response values at a wavelength step equal to the one of the flux table. The command <TT>RESPONSE/LONG</TT> interpolates these values using a polynomial or spline interpolation scheme. <P> This response curve can be applied to a one- or two-dimensional extracted, wavelength calibrated and extinction corrected (<TT>EXTINCTION/LONG</TT>) spectrum by the command <TT>CALIBRATE/FLUX</TT>. <P> Verification commands include <TT>PLOT/FLUX</TT> to visualize the standard star reference flux table and <TT>PLOT/RESPONSE</TT> to vizualize the final instrumental response<A NAME="5879"> </A> function. <P> <BR><HR> <!--Table of Child-Links--> <A NAME="CHILD_LINKS"> </A> <UL> <LI><A NAME="tex2html3104" HREF="node134.html">Flux Calibration and Extinction Correction</A> <LI><A NAME="tex2html3105" HREF="node135.html">Airmass Calculation</A> </UL> <!--End of Table of Child-Links--> <BR><HR> <ADDRESS> <I>Petra Nass</I> <BR><I>1999-06-15</I> </ADDRESS> </BODY> </HTML>
