<!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>Astrophysical Context</TITLE> <META NAME="description" CONTENT="Astrophysical Context"> <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="node184.html"> <LINK REL="previous" HREF="node177.html"> <LINK REL="up" HREF="node176.html"> <LINK REL="next" HREF="node180.html"> </HEAD> <BODY > <!--Navigation Panel--> <A NAME="tex2html3666" HREF="node180.html"> <IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="icons.gif/next_motif.gif"></A> <A NAME="tex2html3663" HREF="node176.html"> <IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="icons.gif/up_motif.gif"></A> <A NAME="tex2html3657" HREF="node178.html"> <IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="icons.gif/previous_motif.gif"></A> <A NAME="tex2html3665" 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="tex2html3667" HREF="node180.html">Basic Equations</A> <B> Up:</B> <A NAME="tex2html3664" HREF="node176.html">Inter-stellar/galactic Absorption Line Modelling</A> <B> Previous:</B> <A NAME="tex2html3658" HREF="node178.html">Principle of the Program</A> <BR> <BR> <!--End of Navigation Panel--> <H1><A NAME="SECTION001320000000000000000"> Astrophysical Context</A> </H1> <P> The process of absorption line formation in the intersteller medium has been described in detail by several authors (e.g. Strömgren 1948, Spitzer 1978). Here we shall give only the basic formulae and the variables to which the user has access in order to make the notations used in the program precise. <P> <BR><HR> <!--Table of Child-Links--> <A NAME="CHILD_LINKS"> </A> <UL> <LI><A NAME="tex2html3668" HREF="node180.html">Basic Equations</A> <UL> <LI><A NAME="tex2html3669" HREF="node181.html">Optical Depth</A> <LI><A NAME="tex2html3670" HREF="node182.html">Broadening Function</A> </UL> <LI><A NAME="tex2html3671" HREF="node183.html">Summary of the parameters handled by the user:</A> </UL> <!--End of Table of Child-Links--> <BR><HR> <ADDRESS> <I>Petra Nass</I> <BR><I>1999-06-15</I> </ADDRESS> </BODY> </HTML>
