<!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>Problems with star names</TITLE> <META NAME="description" CONTENT="Problems with star names"> <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="previous" HREF="node299.html"> <LINK REL="up" HREF="node293.html"> <LINK REL="next" HREF="node301.html"> </HEAD> <BODY > <!--Navigation Panel--> <A NAME="tex2html5166" HREF="node301.html"> <IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="icons.gif/next_motif.gif"></A> <A NAME="tex2html5163" HREF="node293.html"> <IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="icons.gif/up_motif.gif"></A> <A NAME="tex2html5159" HREF="node299.html"> <IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="icons.gif/previous_motif.gif"></A> <A NAME="tex2html5165" 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="tex2html5167" HREF="node301.html">Installation</A> <B> Up:</B> <A NAME="tex2html5164" HREF="node293.html">Special problems</A> <B> Previous:</B> <A NAME="tex2html5160" HREF="node299.html">CCD data</A> <BR> <BR> <!--End of Navigation Panel--> <H3><A NAME="SECTION001859700000000000000"> Problems with star names</A> </H3> <P> If the star names used in data files are not <I>exactly</I> the same character strings as those used in star files, the reduction program will try to make cross-identifications. These are based on heuristic rules that are generally observed in naming stars -- for example, many stars have a catalog abbreviation followed by a number, or a Greek letter followed by a constellation abbreviation. The program recognizes some common catalog abbreviations (HR, BS, BD, CD, CPD, HD, NGC), but will guess that two or three letters followed by a number represents such a name. It also can cope with common suffixes like A, B, and AB for multiple stars. <P> The program applies these rules in attempting to parse name strings containing multiple designations that are not separated by the `` <TT>=</TT> '' string (surrounded by blanks). If you sometimes write a name with an embedded blank and sometimes without (e.g., ``<TT>HR 123</TT>'' vs. ``<TT>HR123</TT>''), it may be able to identify the two as equivalent, or it may ask for help. It is difficult to write a simple set of foolproof rules for recognizing star names; for example, the program cannot simply squeeze out embedded blanks, as it would then confuse BD +1 2345 with BD +12 345. <P> Occasionally a typing error can confuse the program, and it will print <TT>Cannot parse:</TT> followed by a name string. For example, spelling errors in constellation abbreviations, Greek letters, or the letter O for a digit 0 can cause such a message. In these cases, the program asks for help, and asks for a replacement name string (which can contain embedded blanks). Afterward, the replacement string will be used instead of the one that caused problems. <P> This situation can be avoided by making sure that all star names are spelled consistently, and that names in star files agree with names in data files. <P> <HR> <!--Navigation Panel--> <A NAME="tex2html5166" HREF="node301.html"> <IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="icons.gif/next_motif.gif"></A> <A NAME="tex2html5163" HREF="node293.html"> <IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="icons.gif/up_motif.gif"></A> <A NAME="tex2html5159" HREF="node299.html"> <IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="icons.gif/previous_motif.gif"></A> <A NAME="tex2html5165" 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="tex2html5167" HREF="node301.html">Installation</A> <B> Up:</B> <A NAME="tex2html5164" HREF="node293.html">Special problems</A> <B> Previous:</B> <A NAME="tex2html5160" HREF="node299.html">CCD data</A> <!--End of Navigation Panel--> <ADDRESS> <I>Petra Nass</I> <BR><I>1999-06-15</I> </ADDRESS> </BODY> </HTML>
