% Documentation for A Catalogue of DM, HD(E) and Other Cross-Identifications
% for Stars in Open Clusters (Mermilliod 1986)
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% Document Number: STX-T-25-3002-0002-88
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% Written: June 1988 by Anne C. Raugh
% TeX Ver: Nov 1990 by Lee E. Brotzman
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\documentstyle [titlepage,adc,11pt]{article}
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\newcommand{\dmv}{Documentation for the Computer-Readable Version of}
\newcommand{\catone}{A Catalogue of DM, HD(E) and Other Cross-Identifications}
\newcommand{\cattwo}{for Stars in Open Clusters}
\newcommand{\abbr}{CISOC}
\newcommand{\catref}{Mermilliod (1986)}
\newcommand{\pcatref}{Mermilliod 1986}
\newcommand{\docnum}{STX-T-25-3002-0002-88}
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\begin{document}
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\title{ \catone\ \cattwo \\ (\pcatref) }
%\author{{\LARGE (\pcatref)} \\
%        \\
\author{Documentation for the Computer-Readable Version \\
        \\
        {\small Anne C. Raugh} \\
        {\small June 1988} \\
        \\
        {\small Doc. No. \docnum} \\
        {\small Contract NAS 5-28752} \\
        \\
        \\
        {\small Prepared for:} \\
        {\small National Aeronautics and Space Administration} \\
        {\small Goddard Space Flight Center} \\
        {\small Greenbelt, MD 20771} \\
        \\
        \\
        {\small Prepared by:} \\
        {\small ST Systems Corporation} \\
        {\small 4400 Forbes Blvd.} \\
        {\small Lanham, Maryland 20706} }
\date{}
\maketitle
%
% ********************************************************

\begin{abstract}

This document describes the computer-readable version of {\em \catone\ \cattwo}
(\pcatref) distributed by the Astronomical Data Center, NASA Goddard Space
Flight Center. This catalog lists cross-identifications between the numbering
system of Mermilliod (1978) for stars in open clusters and the numbering
systems of several other astronomical catalogs, including HR, HD-HDE, DM, LS,
LSS, GCVS, IDS, ADS, SAO, and several smaller lists. Inverse tables are
included for each catalog. This version updates and expands the version
presented by Mermilliod (1976).

The catalog is in 13 files: the first file contains the main
cross-identification list from the Mermilliod (1978) system to the other
catalogs; the next 11 files contain the inverse lists from the catalogs to
Mermilliod (1978); and the thirteenth file contains a list of the references
adopted for the individual star numberings for each cluster used by the
Mermilliod (1978) system.

The present document describes the overall file structure and the individual
data fields.

\end{abstract}

\tableofcontents
\pagebreak

\section{Introduction}

{\bf A copy of this document should be distributed with every copy of the
computer-readable catalog.}

\subsection{Description}

{\em \catone\ \cattwo} (\abbr ; \pcatref) is a compilation of
cross-identifications from the numbering system of Mermilliod (1978) to various
astronomical catalogs and lists. Also included are files listing the inverse
cross-identifications from each catalog to the Mermilliod (1978) numbers. This
version offers several improvements over the version of Mermilliod (1976):

\begin{itemize}

\item Some erroneous identifications have been corrected.
\item New references for the star numberings of 26 open clusters have been
adopted, including the following:

\begin{tabbing}
xxxxxx \= NGC 9999 xxxxxx \= NGC 9999 xxxxxx \=    \kill
\> NGC 957  \> NGC 2547 \> NGC 6709            \\
\> NGC 2099 \> NGC 3324 \> IC 2944             \\
\> NGC 2129 \> NGC 3532 \> Hogg 16             \\
\> NGC 2244 \> NGC 3590 \> Trumpler 14         \\
\> NGC 2423 \> NGC 5168 \> Trumpler 16         \\
\> NGC 2453 \> NGC 5662 \> Trumpler 17         \\
\> NGC 2477 \> NGC 5822 \> Stock 14            \\
\> NGC 2506 \> NGC 6705 \> Collinder 140
\end{tabbing}

\item Cross-identifications have been added for 75 clusters.
\item The cross-identifications have been extended to a number of new
catalogs, including the catalogs of luminous stars in the northern and
southern Milky Way, variable stars, multiple-system components from the
{\em Index Catalog of Double Stars}, the SAO, and several small lists.

\end{itemize}

The catalog is in 13 files: the first file lists Mermilliod number and
cross-identification in all catalogs for 9543 open-cluster stars; the next 11
files contain the inverse listings for each individual catalog; and the
thirteenth file lists the references adopted for the star numbering of each
cluster in the system of Mermilliod (1978).

\subsection{Source References}

\begin{references}

\item Mermilliod, J.-C. 1986, {\em Astron. Astrophys. Suppl. Ser.},
{\bf 63}, 293.
\item Mermilliod, J.-C. 1978, {\em Bull. Inform. CDS}, {\bf 14}, 32.
\item Mermilliod, J.-C. 1976, {\em Astron. Astrophys. Suppl. Ser.},
{\bf 26}, 419.

\end{references}

\section{Structure}

\subsection{Each File as a Whole}

The \abbr\ consists of 13 files. Table \ref{t:sumtab} gives the
machine-independent file attributes. All records are of fixed length. The
first file contains the cross-identifications from Mermilliod (1978) to the
various astronomical catalogs and lists (Table \ref{t:cattab}), the second
through twelfth files contain the inverse lists for the individual catalogs
(Tables \ref{t:in1tab} and \ref{t:in2tab}), and the thirteenth file lists
references to the cluster-star numberings in the system of Mermilliod (1978)
(Table \ref{t:in2tab}). Detailed descriptions of each file are given in the
following sections.

{\bf Quotations in any of the following descriptions come from \catref\ unless
otherwise noted}.

\begin{table}[htbp]
\centering
\begin{tabular}{|r|l|c|r|r|}               \hline
\mcol{5}{|c|}{\catone}                \\
\mcol{5}{|c|}{\cattwo\/ (\pcatref)}   \\   \hline
     &                        & Record & Record & \mcol{1}{c|}{Number of} \\
File & \mcol{1}{c|}{Contents} & Format & Length & \mcol{1}{c|}{Records}   \\ \hline
  1  & Main Data              & Fixed  &  128   & 9,543  \\
  2  & HR                     & Fixed  &   26   &   295  \\
  3  & HD                     & Fixed  &   26   & 4,237  \\
  4  & DM                     & Fixed  &   26   & 7,892  \\
  5  & LS                     & Fixed  &   26   &   299  \\
  6  & LSS                    & Fixed  &   26   &   435  \\
  7  & GCVS                   & Fixed  &   26   &   847  \\
  8  & IDS                    & Fixed  &   26   & 1,023  \\
  9  & ADS                    & Fixed  &   26   &   449  \\
 10  & SAO                    & Fixed  &   26   & 2,773  \\
 11  & Miscellaneous          & Fixed  &   26   & 1,106  \\
 12  & Selected areas         & Fixed  &   26   &   223  \\
 13  & References             & Fixed  &   78   &   328  \\ \hline
\end{tabular}
\caption{Summary Description of Catalog Files}
\label{t:sumtab}
\end{table}

\subsection{Main Data (File 1 of 13)}
\label{s:cathd}

This file lists the cross-identifications from the numbering system of
Mermilliod (1978) to a number of astronomical catalogs and lists. The field
description for each name is the same throughout all the catalog files.

\begin{table}[htbp]
\centering
\begin{tabular}{|c|c|l|c|c|l|}               \hline
 Bytes   & Format & \mcol{1}{c|}{Data name} & Bytes   & Format & \mcol{1}{c|}{Data name}  \\ \hline
 1-10    & I10    & Mermilliod number       & 63-72   & A10    & IDS identification       \\
 11      & A1     & Merm. number suffix     & 73      & 1X     & Blank                    \\
 12-16   & I5     & HR number               & 74-76   & A3     & IDS components           \\
 17-23   & I7     & HD number               & 77-82   & I6     & ADS number               \\
 24      & 1X     & Blank                   & 83-89   & I7     & SAO number               \\
 25-34   & A10    & DM number               & 90      & 1X     & Blank                    \\
 35      & A1     & DM remark               & 91-99   & A9     & Misc. name 1             \\
 36      & 1X     & Blank                   & 100     & 1X     & Blank                    \\
 37-46   & A10    & LS name                 & 101-109 & A9     & Misc. name 2             \\
 47-51   & I5     & LSS number              & 110     & 1X     & Blank                    \\
 52      & 1X     & Blank                   & 111-119 & A9     & Misc. name 3             \\
 53-61   & A9     & GCVS identification     & 120     & 1X     & Blank                    \\
 62      & 1X     & Blank                   & 121-128 & A8     & Bayer/Flamsteed name     \\ \hline
\end{tabular}
\caption{Main Data File Record Format}
\label{t:cattab}
\end{table}

\begin{definition}{20ex}

\item[Mermilliod number] Code number based on the cluster in which the star is
found and the number of the star in the designated reference (see Section
\ref{s:invhd}). A brief description of this numbering system is included
in Appendix A: ``Mermilliod (1978) Numbering System.'' [bytes 1-10, format I10]

\item[Merm. number suffix] Single-character coded remark about this object. A
number identifies one component of a multiple system. The following letters
also appear:

\begin{definition}{4ex}

\item[D] Unresolved binary

\item[S] Supplementary star. The identification for this star is the same as
another in the list, followed by ``a'' or ``s''.

\item[V] Variable star

\end{definition}

[byte 11, format A1]

\item[HR number] Number from the {\em Yale Bright Star Catalog} (Hoffleit and
Jaschek 1982) [bytes 12-16, format I5]

\item[HD number] Number from the {\em Henry Draper Catalog} (Cannon and
Pickering 1918-1924; Cannon 1925-1936; Cannon and Walton Mayall 1949) [bytes
17-23, format I7]

\item[DM number] Durchmusterung number ``according to the HD convention''
[bytes 25-34, format A10]

\item[DM remark] Single-character code as defined above for the {\bf Merm.
number suffix} [byte 35, format A1]

\item[LS name] Number from the {\em Catalogue of Luminous Stars in the Northern
Milky Way, I-VI} (Hardorp, {\em et al.} 1959-1965) [bytes 37-46, format A10]

\item[LSS number] Number from the {\em Catalogue of Luminous Stars in the
Southern Milky Way} (Stephenson and Sanduleak 1971) [bytes 47-51, format I5]

\item[GCVS identification] Identification from the {\em General Catalogue of
Variable Stars} (Kukarkin, {\em et al.} 1971-1976) [bytes 53-61, format A9]

\item[IDS identification] Identification from the {\em Index Catalogue of
Double Stars (1976.5)} (Jeffers, van den Bos, and Greeby 1963) [bytes 63-72,
format A10]

\item[IDS components] One or more letters identifying the components of a
multiple system included in the Mermilliod designation [bytes 74-76, format
A3]

\item[ADS number] Number from {\em Aitken's Double Star Catalogue} (Aitken
1932) [bytes 77-82, format I6]

\item[SAO number] Number from the SAO catalog (SAO Staff 1966) [bytes 83-89,
format I7]

\item[Misc. names] Names from the smaller catalogs and lists. See Table
\ref{t:sclist} for a list of the catalogs included. [bytes 91-99, 101-109, and
111-119, all format A9]

\item[Bayer/Flamsteed] [bytes 121-128, format A8]

\end{definition}

\subsection{Inverse Indentifications and References (Files 2 through 13)}
\label{s:invhd}

These files contain inverse cross-identifications from the above catalogs to
the system of Mermilliod (1978). Originally the DM Inverse File (file 4)
contained only those DM stars with no other identifications. At the suggestion
of J.-C. Mermilliod, this file was recompiled from the main catalog file and
now lists {\em all} stars with a DM number.  The Miscellaneous Inverse File
(file 11) contains cross-identifications from a number of smaller catalogs and
lists, as described in Table \ref{t:sclist}. The Selected Areas Inverse File
(file 12) contains cross-identifications from the {\em Bergedorfer
Spektral-Durchmusterung of the Selected Areas (No. 1-115)} and the {\em
Potsdamer Spektral-Durchmusterung} (Schwassman, van Rhijn, and Plaut, 1935;
Becker, 1929, 1930, 1931 and 1938; and Brueck, 1935).

The Reference File (file 13) lists the references to the numbering within each
cluster, as used in the Mermilliod (1978) system.  The fields in the Reference
File are defined as follows:

\begin{definition}{20ex}

\item[Cluster number] Number of the cluster in the system of Mermilliod (1978).
The last four bytes contain ``BBBB'' where the star number would normally
occur. A brief description of this numering system is included below, in
Appendix A.

\item[Reference] Reference which defines the numbering system for the stars of
this cluster. When bytes 1-9 are blank, this field continues the reference of
the previous cluster.

\end{definition}

\begin{table}[htbp]
\centering
\begin{tabular}{|c|c|l|c|c|l|}     \hline
\mcol{3}{|c|}{HR Inverse (File 2 of 13)}  & \mcol{3}{c|}{HD Inverse (File 3 of 13)}  \\ \hline
 Bytes & Format & \mcol{1}{c|}{Data name} & Bytes & Format & \mcol{1}{c|}{Data name} \\ \hline
 1-4   &   I4   & HR number               & 1-4   &   4X   & Blank                   \\
 5     &   1X   & Blank                   & 5-10  &   I6   & HD(E) number            \\
 6-13  &   A8   & Bayer/Flamsteed name    & 11-16 &   6X   & Blank                   \\
 14-16 &   3X   & Blank                   & 17-25 &   I9   & Mermilliod number       \\
 17-25 &   I9   & Mermilliod number       & 26    &   A1   & Merm. number suffix     \\
 26    &   A1   & Merm. number suffix     &       &        &                         \\ \hline
\mcol{3}{|c|}{DM Inverse (File 4 of 13 )} & \mcol{3}{c|}{LS Inverse (File 5 of 13)}  \\ \hline
 Bytes & Format & \mcol{1}{c|}{Data name} & Bytes & Format & \mcol{1}{c|}{Data name} \\ \hline
 1-10  &   A10  & DM number               & 1-10  &   A10  & LS number               \\
 11-16 &   6X   & Blank                   & 11-16 &   6X   & Blank                   \\
 17-25 &   I9   & Mermilliod number       & 17-25 &   I9   & Mermilliod number       \\
 26    &   A1   & Merm. number suffix     & 26    &   A1   & Merm. number suffix     \\ \hline
\mcol{3}{|c|}{LSS Inverse (File 6 of 13)} & \mcol{3}{c|}{GCVS Inverse (File 7 of 13)}\\ \hline
 Bytes & Format & \mcol{1}{c|}{Data name} & Bytes & Format & \mcol{1}{c|}{Data name} \\ \hline
 1-6   &   6X   & Blank                   & 1-3   &   3X   & Blank                   \\
 7-10  &   I4   & LSS number              & 4-12  &   A9   & GCVS identification     \\
 11-16 &   6X   & Blank                   & 13-16 &   4X   & Blank                   \\
 17-25 &   I9   & Mermilliod number       & 17-25 &   I9   & Mermilliod number       \\
 26    &   A1   & Merm. number suffix     & 26    &   A1   & Merm. number suffix     \\ \hline
\mcol{3}{|c|}{IDS Inverse (File 8 of 13)} & \mcol{3}{c|}{ADS Inverse (File 9 of 13)} \\ \hline
 Bytes & Format & \mcol{1}{c|}{Data name} & Bytes & Format & \mcol{1}{c|}{Data name} \\ \hline
 1-10  &   A10  & IDS identification      & 1-4   &   4X   & Blank                   \\
 11    &   1X   & Blank                   & 5-9   &   I5   & ADS number              \\
 12-14 &   A3   & IDS components          & 10    &   1X   & Blank                   \\
 15-16 &   2X   & Blank                   & 11-13 &   A3   & ADS components          \\
 17-25 &   I9   & Mermilliod number       & 14-16 &   3X   & Blank                   \\
 26    &   A1   & Merm. number suffix     & 17-25 &   I9   & Mermilliod number       \\
       &        &                         & 26    &   A1   & Merm. number suffix     \\ \hline
\end{tabular}
\caption{Inverse File Record Formats}
\label{t:in1tab}
\end{table}

\begin{table}[htbp]
\centering
\begin{tabular}{|c|c|l|c|c|l|}     \hline
\mcol{3}{|c|}{SAO Inverse (File 10 of 13)} & \mcol{3}{c|}{Miscellaneous Inverse (File 11 of 13)} \\ \hline
 Bytes & Format & \mcol{1}{c|}{Data name} & Bytes & Format & \mcol{1}{c|}{Data name} \\ \hline
 1-4   &   4X   & Blank                   & 1-10  &   A10  & Identification          \\
 5-10  &   I6   & SAO number              & 11-16 &   6X   & Blank                   \\
 11-16 &   6X   & Blank                   & 17-25 &   I9   & Mermilliod number       \\
 17-25 &   I9   & Mermilliod number       & 26    &   A1   & Merm. number suffix     \\
 26    &   A1   & Merm. number suffix     &       &        &                         \\ \hline
\mcol{3}{|c|}{Selected Areas Inverse (File 12 of 13)} & \mcol{3}{c|}{References (File 13 of 13)} \\ \hline
 Bytes & Format & \mcol{1}{c|}{Data name} & Bytes & Format & \mcol{1}{c|}{Data name} \\ \hline
 1     &   1X   & Blank                   & 1-9   &   A9   & Cluster number          \\
 2-10  &   A9   & Identification          & 10-12 &   3X   & Blank                   \\
 11-16 &   6X   & Blank                   & 13-78 &   A66  & Reference               \\
 17-25 &   I9   & Mermilliod number       &       &        &                         \\
 26    &   A1   & Merm. number suffix     &       &        &                         \\ \hline
\end{tabular}
\caption{Inverse and Reference File Record Formats (cont'd)}
\label{t:in2tab}
\end{table}

\begin{table}[htbp]
\centering
\begin{tabular}{|l|r|l|}
\hline
\mcol{1}{|c|}{Catalog} & \mcol{1}{c|}{Entries}   & \mcol{1}{|c|}{Reference} \\
\hline
 AS  &   1 & Merrill, and Burwell (1950)                \\
 BAT &  64 & Batten, Fletcher, and Mann (1978)          \\
 GL  &   5 & Gliese (1969)                              \\
 HE3 &  46 & Henize (1976)                              \\
 KS  &  62 & Klare and Szeidl (1966)                    \\
 MCC &  13 & MacConnell (1981)                          \\
 MWC &  31 & Merrill and Burwell (1933, 1943, and 1949) \\
 PLF & 482 & Pleiades Flare Stars Unified Numbering     \\
 ROA &   4 & Woolley {\em et al.} (1970)                \\
 SOS & 376 & Loden {\em et al.} (1976)                  \\
 SS  &   6 & Stephenson and Sanduleak (1977)            \\
 VES &  16 & Coyne {\em et al.} (1974-78)               \\ \hline
\end{tabular}
\caption{Miscellaneous Catalogs and Lists Included in the \abbr}
\label{t:sclist}
\end{table}

\section{History}
\label{s:history}

\subsection{Remarks and Modifications}

{\em \catone\ \cattwo } was received by the Astronomical Data Center (ADC),
NASA Goddard Space Flight Center, from the Centre de Donn\'{e}es Astronomiques,
Strasbourg (CDS), in July 1985.

The original tape consisted of 14 text files. The first file contained a brief
description of the 13 catalog files and has been incorporated into this
document. Of the remaining files, the first held the cross-identification file,
the second through twelfth contained the inverse files, and the thirteenth
contained the star numbering references. Blank columns were removed from the
beginning and end of all records in the inverse files by means of an editor, to
reduce the record size from 40 to 26 bytes. In the reference file, two header
records were deleted and the cluster numbers were reformatted slightly to
coincide with the format of the star numbers in the catalog files, reducing the
record size from 80 to 78 bytes.

The file containing the inverse identifications for the stars with
Durchmusterung numbers originally contained only those stars with no other
identification. At the suggestion of J.-C. Mermilliod, this file was recompiled
from the main catalog file and now includes all stars with a DM number listed
in the main file.

A FORTRAN program was run to check the validity of each field according to its
data type and value.

\subsection{References to the Documentation}

\begin{references}

\item Aitken, R. G. 1932, {\em Carnegie Institution of Washington,
      Publ. No. 417} (ADS; Washington).
\item Batten, A. H., Fletcher, J. M., and Mann, P. J. 1978,
      {\em Publ. Dominion Astrophys. Obs.}, {\bf 15}, No. 15 (BAT).
\item Becker, F. 1929, {\em Publ. Astrophys. Obs. Potsdam},
      {\bf 27}, No. 88 (PSD Part I).
\item Becker, F. 1930, {\em Publ. Astrophys. Obs. Potsdam},
      {\bf 27}, No. 89 (PSD Part II).
\item Becker, F. 1931, {\em Publ. Astrophys. Obs. Potsdam},
      {\bf 27}, No. 90 (PSD Part III).
\item Becker, F. 1938, {\em Publ. Astrophys. Obs. Potsdam},
      {\bf 28}, No. 92 (PSD Part V).
\item Brueck, H. 1935, {\em Publ. Astrophys. Obs. Potsdam},
      {\bf 28}, No. 91 (PSD Part IV).
\item Cannon, A. J. and Pickering, E. C. 1918-1924,
      {\em Ann. Astron. Obs. Harvard College}, {\bf 91-99} (HD).
\item Cannon, A. J. 1925-1936, {\em Ann. Astron. Obs. Harvard
      College}, {\bf 100} (HDE).
\item Cannon, A. J. and Walton Mayall, M. 1949,
      {\em Ann. Astron. Obs. Harvard College}, {\bf 112}, 1 (HDE).
\item Coyne, G. {\em et al.} 1974, {\em Vatican Obs. Publ. 1},
      No. 5 (VES, Part I).
\item Coyne, G. {\em et al.} 1975, {\em Vatican Obs. Publ. 1},
      No. 6 (VES, Part II).
\item Coyne, G. {\em et al.} 1976, {\em Vatican Obs. Publ. 1},
      No. 8 (VES, Part III).
\item Coyne, G. {\em et al.} 1977, {\em Vatican Obs. Publ. 1},
      No. 11 (VES, Part IV).
\item Coyne, G. {\em et al.} 1978, {\em Vatican Obs. Publ. 1},
      No. 12 (VES, Part V).
\item Gliese, W. 1969, {\em Catalogue of Nearby Stars},
      Veroeff. Heidelberg, No. 22 (GL).
\item Hardorp, J. {\em et al.} 1959-1965, {\em Luminous Stars in
      Northern Milky Way, I-VI} (LS; Hamburg-Bergedorf: Hamburger
      Sternwarte - Warner and Swasey Observatory).
\item Henize, K. G. 1976, {\em Astrophys. J. Suppl. Ser.},
      {\bf 30}, 491 (HE3).
\item Hoffleit, D. and Jaschek, C. 1982, {\em Bright Star Catalogue}
      (HR; New Haven: Yale University Observatory).
\item Jeffers, H. M., van den Bos, W. H., and Greeby, F. M. 1963,
      {\em Publ. Lick Obs.}, {\bf 21}, 17 (IDS).
\item Klare, G. and Szeidl, B. 1966, {\em Veroeff.
      Landessternw. Heidelberg}, No. 18 (KS).
\item Kukarkin, B. V. {\em et al.} 1971-1976, {\em General Catalogue
      of Variable Stars} and supplements (GCVS; Moscow: Academy of Sciences
      of the USSR, Astronomical Council, Sternberg State Astronomical
      Institute of the Moscow State University).
\item Loden, L. O., Loden, K., Nordstrom, B., and Sundman, A. 1976,
      {\em Astron. Astrophys. Suppl. Ser.}, {\bf 23}, 283 (SOS).
\item MacConnell, D. J. 1981, {\em Astron. Astrophys. Suppl. Ser.},
      {\bf 44}, 387 (MCC).
\item Mermilliod, J.-C. 1978, {\em Bull Inform. CDS}, {\bf 14}, 32.
\item Mermilliod, J.-C. 1985, unpublished documentation received with
      the catalog from the CDS.
\item Mermilliod, J.-C. 1986, {\em Astron. Astrophys. Suppl. Ser.},
      {\bf 63}, 293.
\item Mermilliod, J.-C. 1987, private communication.
\item Merrill, P. W. and Burwell, C. G. 1933, {\em Astrophys. J.},
      {\bf 78}, 87 (MWC, Part I).
\item Merrill, P. W. and Burwell, C. G. 1943, {\em Astrophys. J.},
      {\bf 98}, 153. (MWC, Part II).
\item Merrill, P. W. and Burwell, C. G. 1949, {\em Astrophys. J.},
      {\bf 110}, 387 (MWC, Part III).
\item Merrill, P. W. and Burwell, C. G. 1950,
      {\em Astrophys. J.}, {\bf 112}, 72 (AS).
\item Smithsonian Astrophysical Observatory 1966, {\em Smithsonian
      Astrophysical Observatory Star Catalog} (SAO; Washington, D.C.:
      Smithsonian Institution).
\item Stephenson, C. B. and Sanduleak, N. 1971, {\em Publ. Warner and
      Swasey Observatory}, {\bf 1}, 100 (LSS).
\item Stephenson, C. B. and Sanduleak, N. 1977,
      {\em Astrophys, J. Suppl. Ser.}, {\bf 33}, 459 (SS).
\item Schwassman, A., van Rhijn, P. J., and Plaut, L. 1935,
      {\em Bergedorf, Verlag der Sternwarte}, 64 (BSD).
\item Woolley, R., Epps, E. A., Penston, M. J., and Pocock, S. B. 1970,
      {\em Royal Obs. Ann.}, No. 5 (ROA).

\end{references}

\pagebreak
\appendix

\section{Mermilliod (1978) Numbering System}

Following is a very brief description of the numbering system presented in
Mermilliod (1978) for stars in open clusters. It is taken directly from
Mermilliod (1978) and Mermilliod (1985). See Mermilliod (1978) for a complete
description of this numbering system and a list of the various code numbers
used.

Nine-digit numbers are used to identify a star according to cluster membership:
the first digit indicates the source catalog; the next four digits represent
the number of the cluster within that catalog; and the final four digits are
the number of the particular star within that cluster, as adopted by the
standard reference for the system. These references are listed in the
thirteenth file of this catalog (see Section \ref{s:invhd}).

Following is a summary of the main divisions for clusters in this
catalog.

\begin{table}[htbp]
\centering
\begin{tabular}{|l|c|l|}
\hline
 \multicolumn{1}{|c|}{Number} &  Cluster  &    \\
 \multicolumn{1}{|c|}{Format} &  Type     & \multicolumn{1}{c|}{Meaning} \\
                                                                        \hline
 2NNNNXXX  &    NGC    & NNNN = NGC number                           \\
           &           & XXXX = star number                          \\ \hline
 3IIIIXXXX &    IC     & IIII = IC number                            \\
           &           & XXXX = star number                          \\ \hline
 4AABBXXXX & Anonymous & AA = author code (1-41)                     \\
           &           & BB = cluster number in the author's list (1-99) \\
           &           & XXXX = star number                          \\ \hline
 5ABBBXXXX & Anonymous & A = author code (1-5)                       \\
           &           & BBB = cluster number in the list            \\
           &           & XXXX = star number                          \\ \hline
\end{tabular}
\caption{Mermilliod (1978) Number Definition}
\label{t:apptab}
\end{table}

\end{document}
