% Documentation for Catalogue of UBV Photometry and MK Spectral Types in Open
% Clusters (Third edition) (Mermilliod 1986)
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% Document Number: STX-T-25-3002-0015-87
%
% Written: September 1987 by Anne C. Raugh
% TeX Ver: December 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 the}
\newcommand{\catone}{Catalogue of UBV Photometry and MK Spectral Types}
\newcommand{\cattwo}{in Open Clusters (Third edition)}
\newcommand{\abbr}{UBVMK}
\newcommand{\catref}{Mermilliod (1986)}
\newcommand{\pcatref}{Mermilliod 1986}
\newcommand{\docnum}{STX-T-25-3002-0015-87}
%
\begin{document}
%
\title{ \catone\ \cattwo }
\author{{\LARGE (\pcatref)} \\
        \\
        Documentation for the Computer-Readable Version \\
        \\
        {\small Anne C. Raugh} \\
        {\small September 1987} \\
        \\
        {\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 the {\em \catone\
\cattwo } (\pcatref{\em a}) distributed by the Astronomical Data Center, NASA
Goddard Space Flight Center. This catalog is a compilation of {\em UBV}
photoelectric photometry and MK classifications published prior to mid-1986 for
stars in 295 open clusters. Listed for each of 16,433 stars are
identifications, cross-identifications, {\em V}, {\em B-V}, {\em U-B}, spectral
type, remarks on various peculiarities, and references.

The catalog is in five files. The first file contains the catalog data; the
second file lists references to the numbering of stars in each individual
cluster; the third file lists references to the photometry, sorted by journal;
the fourth file lists references to the spectral types, sorted by journal; and
the fifth file lists the references of the third and fourth files, sorted by
reference number and type. The present document describes the overall file
structure and the individual data fields.

\end{abstract}

\tableofcontents
\listoftables
\pagebreak

\section{Introduction}

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

\subsection{Description}

The {\em \catone\ \cattwo } (\abbr ; \pcatref{\em a}) is a compilation of
photoelectric {\em UBV} photometry and MK spectral types published up to
mid-1986 for 16,433 stars in 295 open clusters. It updates the 1976 edition
(available on magnetic tape) and contains nearly twice as much data as the
earlier version.

The catalog is in five files: the first file contains the catalog data; the
second file lists references to the numbering systems for each cluster; the
third file lists the references for the {\em UBV} data, sorted by journal; the
fourth file lists references for the MK spectral types, sorted by journal; and
the fifth file lists the combined references of the third and fourth files,
sorted by reference number and type.

\subsection{References}

\begin{references}

\item Mermilliod, J.-C 1976, {\em CDS Inform. Bull.}, {\bf 11}, 16.
\item Mermilliod, J.-C. 1986{\em a}, {\em CDS Inform. Bull.}, {\bf 31}, 175.

\end{references}

\section{Structure}

\subsection{Each File as a Whole}

The \abbr\ consists of five files. Table \ref{t:filfig} lists the
machine-independent file attributes. All records are of fixed length. The first
file contains the catalog data (Table \ref{t:catfig}); the second file lists
the full forms of the references to the individual cluster numbering systems
(Table \ref{t:numfig}); the third file lists references to the {\em UBV}
photometry, sorted by journal; the fourth file lists references to the MK
spectral types, sorted by journal; and the fifth file lists the combined
references of the third and fourth files, sorted by reference number and type
(Table \ref{t:reffig}). Detailed descriptions of each file are given in the
following sections.

{\bf Quotations in any of the following descriptions come from Mermilliod
(1986{\em a}) unless otherwise noted}.

\begin{table}[htbp]
\centering
\begin{tabular}{|c|l|c|c|r|}                                  \hline
\multicolumn{5}{|c|}{\catone}                              \\
\multicolumn{5}{|c|}{\cattwo\ (\abbr)}                     \\ \hline
     &                               & Record & Record &
                                     \multicolumn{1}{c|}{Number of} \\
File & \multicolumn{1}{c|}{Contents} & Format & Length &
                                     \multicolumn{1}{c|}{Records}   \\ \hline
  1  & Catalog                       & Fixed  &  128   &  24,856    \\
  2  & Number references             & Fixed  &   80   &     369    \\
  3  & {\em UBV} references          & Fixed  &   80   &     981    \\
  4  & MK references                 & Fixed  &   80   &     528    \\
  5  & Sorted references             & Fixed  &   80   &   1,240    \\ \hline
\end{tabular}
\caption{Summary Description of Catalog Files}
\label{t:filfig}
\end{table}

\subsection{Catalog (File 1 of 5)}
\label{s:cathd}

This file lists the catalog data. In all cases, a blank field indicates no
data.

\begin{table}[htbp]
\centering
\begin{tabular}{|c|c|c|l|}                                         \hline
        &       & Suggested &                           \\
 Bytes  & Units &   Format  & \multicolumn{1}{c|}{Data} \\ \hline
  1- 9  &       &    I9     & Mermilliod number         \\
 10     &       &    A1     & Spectrum remark           \\
 11-15  &       &    A5     & Original ID               \\
 16-20  &       &    A5     & Proper motion ID          \\
 21-26  &       &    I6     & HD/HDE number             \\
 27     &       &    1X     & Blank                     \\
 28-29  &       &    A2     & DM Catalog Identification \\
 30-37  &       &    A8     & DM number                 \\
 38     &       &    1X     & Blank                     \\
 39-45  &   mag &    F7.3   & {\em V}                   \\
 46-52  &   mag &    F7.3   & {\em B-V}                 \\
 53-59  &   mag &    F7.3   & {\em U-B}                 \\
 60-64  &       &    I5     & Photom. reference         \\
 65     &       &    1X     & Blank                     \\
 66-76  &       &    A11    & MK Spectral type          \\
 77-80  &       &    I4     & Spectral type ref.        \\
 81     &       &    1X     & Blank                     \\
 82-128 &       &    A47    & Remarks                   \\ \hline
\end{tabular}
\caption{Catalog File Record Format}
\label{t:catfig}
\end{table}

\begin{definition}{20ex}

\item[Mermilliod number] Number according to the system of Mermilliod (1978). A
short summary of the codes used in this catalog is included below in Appendix
A: ``Mermilliod Numbering System.'' The full forms of the references to the
specific numbering systems for each cluster are listed in the second file.
[bytes 1-9, format I9]

\item[Spectrum remark] Single-character code. The following codes are defined
by Mermilliod (1986{\em b}):

\begin{definition}{4ex}
\item[D] Visual binary
\item[B] Spectroscopic binary
\item[P] Peculiar star
\item[E] Emission-line star
\item[V] Variable star
\end{definition}

[byte 10, format A1]

\item[Original ID] Identification of the star as listed in the reference for
the data [bytes 11-15, format A5]

\item[Proper motion ID] Identification of the star as listed in the proper
motion study. The full form of the reference to the proper motion study is
included in the second file along with the reference to the numbering system.
[bytes 16-20, format A5]

\item[HD/HDE number] [bytes 21-26, format I6]

\item[DM number] [bytes 28-37, format A2,A8]

\item[V] In magnitudes [bytes 39-45, format F7.3]

\item[B-V] In magnitudes [bytes 46-52, format F7.3]

\item[U-B] In magnitudes [bytes 53-59, format F7.3]

\item[Photom. reference] Code number of the reference for the {\em UBV}
photometry. The full forms of these references are listed in the third file by
journal and in the fifth file by reference number. [bytes 60-64, format I5]

\item[MK spectral type] [bytes 66-76, format A11]

\item[Spectral type ref.] Code number of the reference to the {\bf MK spectral
type}. The full forms of these references are listed in the fourth file by
journal and in the fifth file by reference number. [bytes 77-80, format I4]

\item[Remarks] ``Remarks on duplicity, variability, peculiarity and further
cross-identifications.'' The following abbreviations are used in the
cross-identifications:

\begin{description}

\item[HR] Hoffleit, D. 1964, {\em Catalogue of Bright Stars} (New Haven,
Connecticut: Yale University Observatory).   \newline
Hoffleit, D. and Jaschek, C. 1982, {\em Bright Star Catalogue. 4th Revised
Edition} (New Haven, Connecticut: Yale University Observatory).

\item[IDS] Jeffers, H. M., van den Bos, W. H., and Greeby, F. M. 1963, {\em
Index Catalog of Double Stars (1976.5)}: ({\em Pub. Lick Obs.}, {\bf 21}, 17).

\item[ADS] Aitken, R. G. 1932, {\em New General Catalogue of Double Stars
within $120^{\circ}$ of the North Pole} (Washington D.C.: Carnegie Inst. of
Washington; Publ. No. 416).

\item[NLS] Hardorp, J. {\em et al.} 1959-65, {\em Luminous Stars in the
Northern Milky Way I-VI} (Hamburg-Bergedorf: Hamburger Sternwart - Warner and
Swasey Observatory).

\item[LSS] Stephenson, C. B. and Sanduleak, N. 1971, {\em Luminous Stars in the
Southern Milky Way}: ({\em Pub. Warner \& Swasey Obs.}, {\bf 1}, 100).

\item[AS] Merrill, P. W. and Burwell, C. G. 1950, {\em Astrophys. J.}, {\bf
112}, 72.

\item[BATTEN] Batten, A. H., Fletcher, J. M., and Mann, P. J. 1978, {\em Pub.
Dom. Astrophys. Obs.}, {\bf 15}, No. 15.

\item[BSD] Bergedorfer Spektral-Durchmusterung of the Selected Area (No. 1-115)
Potsdamer Spektral-Durchmusterung.

\item[CCS] Stephenson, C. B. 1973, {\em Pub. Warner and Swasey Obs.}, {\bf 1},
No. 4.

\item[GL] Gliese, W. 1969, {\em Catalogue of Nearby Stars} (Heidelberg:
Veroeff. Astron. Rechen-Inst.; No. 22).

\item[HE3] Henize, K. G. 1976, {\em Astrophys. J. Suppl. Ser.}, {\bf 30}, 491.

\item[HRC] Herbig, G. H. and Rao, N. K. 1972, {\em Astrophys. J.}, {\bf 174},
401.

\item[IRC] Neugebauer, G. and Leighton, R. B. 1969, {\em Two-Micron Sky
Survey}, NASA SP-3047.

\item[KS] Klare, G. and Szeidel, B. 1966, {\em Veroeff. Landessternw.
Heidelberg}, No. 18.

\item[MCC] McConnell, D. J. 1981, {\em Astron. Astrophys. Suppl. Ser.}, {\bf
44}, 387.

\item[MWC] Merrill, P. W. and Burwell, C. G. 1933, {\em Astrophys. J.}, {\bf
78}, 87. \newline
Merrill, P. W. and Burwell, C. G. 1943, {\em Astrophys. J.}, {\bf
98}, 153. \newline
Merrill, P. W. and Burwell, C. G. 1949, {\em Astrophys. J.}, {\bf
110}, 387.

\item[PLF] Pleiades Flare Stars Unified Numbering

\item[ROA] Woolley, R. {\em et al.} 1970, {\em Royal Obs. Ann.}, No. 5.

\item[SOS] Loden, L. O., Loden, K., Nordstroem, B., and Sundman, A. 1976, {\em
Astron. Astrophys. Suppl. Ser.}, {\bf 23}, 283.

\item[SS] Stephenson, C. B. and Sanduleak, N. 1977, {\em Astrophys. J. Suppl.
Ser.}, {\bf 33}, 459.

\item[VES] Coyne, G. {\em et al.} 1974, {\em Vatican Obs. Publ.}, {\bf 1},
No. 5. \newline
Coyne, G. {\em et al.} 1975, {\em Vatican Obs. Publ.}, {\bf 1},
No. 6. \newline
Coyne, G. {\em et al.} 1976, {\em Vatican Obs. Publ.}, {\bf 1},
No. 8. \newline
Coyne, G. {\em et al.} 1977, {\em Vatican Obs. Publ.}, {\bf 1},
No. 11. \newline
Coyne, G. {\em et al.} 1978, {\em Vatican Obs. Publ.}, {\bf 1},
No. 12.

\end{description}

[bytes 82-128, format A47]

\end{definition}

\subsection{Number References (File 2 of 5)}
\label{s:numhd}

This file lists the reference to the numbering system for each individual
cluster and to the proper motion study, if any.

\begin{table}[htbp]
\centering
\begin{tabular}{|c|c|c|c|l|}                                         \hline
       & Suggested &                            \\
 Bytes &   Format  & \multicolumn{1}{c|}{Data}  \\ \hline
  1- 2 &    2X     &  Blank                     \\
  3-11 &    A9     &  Group designation         \\
 12-14 &    3X     &  Blank                     \\
 15-80 &    A66    &  Reference                 \\ \hline
\end{tabular}
\caption{Number Reference File Record Format}
\label{t:numfig}
\end{table}

\begin{definition}{20ex}

\item[Group designation] Template for the object numbers of members of this
cluster, in the system of Mermilliod (1978). The object number field has been
replaced by ``BBBB.'' See Appendix A: ``Mermilliod Numbering System'' for a
short summary of the codes used in this catalog. [bytes 3-11, format A9]

\item[Reference] Full form of the reference in which the numbers for the stars
in this cluster are defined. ``*'' in column 80 indicates that a reference to
the proper motion study follows. [bytes 15-80, format A66]

\end{definition}

\subsection{UBV References (File 3 of 5)}
\label{s:prfhd}

This file contains references to the {\em UBV} photometry, sorted by journal
and reference number. The numbers by which the references are cited in the
first file appear on the left and are followed by the volume number, page
number, and author(s). References from different journals are separated by a
heading containing the name of the journal. This file is formatted as 80 byte
lines of text which can be read and printed out with a FORTRAN A80 format.

\subsection{MK References (File 4 of 5)}
\label{s:srfhd}

This file contains the references to the spectral types listed in the first
file. It is organized in the same manner as the third file (see Section
\ref{s:prfhd}). The file is formatted as 80 byte lines of text which can be
read and printed out with a FORTRAN A80 format.

\subsection{Sorted References (File 5 of 5)}
\label{s:refhd}

This file contains the references of the third and fourth file, sorted by
reference number and type (photometry or spectral type). The photometry
references are listed first, followed by the spectral type references.

\begin{table}[htbp]
\centering
\begin{tabular}{|c|c|c|c|l|}                                         \hline
       & Suggested &                            \\
 Bytes &   Format  & \multicolumn{1}{c|}{Data}  \\ \hline
 1- 4  &    I4     & Number                     \\
 5     &    A1     & Type                       \\
 6     &    1X     & Blank                      \\
 7-80  &    A74    & Reference                  \\ \hline
\end{tabular}
\caption{Sorted Reference File Record Format}
\label{t:reffig}
\end{table}

\begin{definition}{20ex}

\item[Number] Code number by which this reference is cited in the appropriate
field of the catalog file [bytes 1-4, format I4]

\item[Type] Single character: ``P'' indicates that this is a photometry
reference; ``S'' indicates that this is a spectral type reference. [byte 5,
format A1]

\item[Reference] Full form of the reference. When bytes 1-5 are blank this
field continues the reference of the previous record. [bytes 7-80, format A74]

\end{definition}

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

\subsection{Remarks and Modifications}

The {\em \catone\ \cattwo } (\abbr ) was received by the Astronomical Data
Center (ADC), NASA Goddard Space Flight Center, from the Centre de Donn\'{e}es
Astronomiques, Strasbourg (CDS), in December 1986.

The original tape consisted of five text files: the first file contained a
description of the catalog files and has been incorporated into this document;
the second file contained the catalog data; the third file listed the
references to the cluster numbering systems; the fourth file listed the {\em
UBV} references; and the fifth file listed the spectral index references.

Several records in the data file were found to have one or more of the data
fields shifted by one byte to the right or left. These were corrected by means
of an editor. The cluster numbers in the numbering reference file were
reformatted slightly to match the format of the star identifications in the
data file. ADC personnel created the fifth file of sorted references by
reformatting and sorting the third and fourth files and combining them into a
single file.

A FORTRAN program was run to check the validity of each field according to its
data type and value. Three typographical errors were discovered and were
corrected by another FORTRAN program. A list of all changes made to the data
file is included in Appendix B: ``Errata.''

\subsection{References to the Documentation}

\begin{references}

\item Mermilliod, J. -C. 1978, {\em CDS Inform. Bull.}, No. 14, 32.
\item Mermilliod, J. -C. 1986{\em a}, {\em CDS Inform. Bull.}, {\bf 31}, 175.
\item Mermilliod, J. -C. 1986{\em b}, unpublished documentation received with
the catalog from the CDS.
\item Mermilliod, J. -C. 1987, private communication.

\end{references}

\pagebreak
\appendix

\section{Mermilliod Numbering System}

The numbering system used to identify objects in this catalog is that developed
at Lausanne and described by Mermilliod (1978). This summary description is
taken directly from Mermilliod (1986{\em b}).

The code number is divided into three sections. The first digit indicates the
source catalog or type of cluster. The following numbers are used in this
catalog:

\begin{tabbing}
\hspace{2.0in} \= {\bf 2} \hspace{8ex} \= NGC                \\
               \> {\bf 3}              \> IC                 \\
               \> {\bf 4}              \> Anonymous cluster  \\
               \> {\bf 5}              \> Anonymous cluster
\end{tabbing}

The next four digits are the number of the cluster in the indicated catalog.
The following anonymous clusters appear:

\begin{tabbing}
\hspace{2.0in} \= {\bf 40901} \hspace{3ex} \= Blanco 1 ($\zeta$ Scl)  \\
               \> {\bf 431XX}              \> Stock's clusters        \\
               \> {\bf 435XX}              \> Trumpler's clusters     \\
               \> {\bf 51XXX}              \> Collinder's clusters    \\
               \> {\bf 52XXX}              \> Melotte's clusters
\end{tabbing}

``XX'' and ``XXX'' represent the cluster number in the list of the cited
author.

The last four digits represent the number of the star in the
indicated cluster.
The references that define the numbering system for each cluster are
listed in the second file, sorted by catalog and cluster number.

\begin{table}[htbp]
\centering
\begin{tabular}{|c|l|}                          \hline
Cluster  &                                   \\
Number   & \multicolumn{1}{c|}{Cluster Name} \\ \hline
20869    & H Persei                          \\
20884    & $\chi$ Persei                     \\
21976    & Orion Nebula Cluster              \\
22632    & Praesepe                          \\
22682    & M67                               \\
32391    & $o$ Velorum                       \\
32601    & $\theta$ Carinae                  \\
40901    & $\zeta$ Sculptoris                \\
43516    & $\eta$ Carinae                    \\
52020    & $\alpha$ Persei (MEL 20)          \\
52022    & Pleiades (MEL 22)                 \\
52025    & Hyades (MEL 25)                   \\
52111    & Coma Berenices (MEL 111)          \\ \hline
\end{tabular}
\caption{Example Cluster Code Numbers}
\label{t:cltab}
\end{table}

\begin{table}[htbp]
\centering
\begin{tabular}{|c|c|c|l|}
\hline
Mermilliod  &               & Same As &            \\
Number      & Read As       & Star \# & In Cluster \\
\hline
201290200   & 2 0129  0200  &   200   &  NGC 129         \\
346650032   & 3 4665  0032  &   32    &  IC 4665         \\
431140012   & 4 31 14 0012  &   12    &  Stock 14        \\
435100008   & 4 35 10 0008  &    8    &  Trumpler 10     \\
511210003   & 5 1 121 0003  &    3    &  Collinder 121   \\
520221438   & 5 2 022 1438  &   1438  &  The Pleiades    \\
\hline
\end{tabular}
\caption{Example Star Numbers}
\end{table}

\pagebreak
\section{Errata}

Several typographical errors were discovered during the preparation of the
\abbr\ catalog file. Following is a list of record numbers in the catalog file
and a description of the changes made to each record.

\begin{table}[htbp]
\centering
\begin{tabular}{|r|p{4.0in}|}
\hline
Record  &                                                   \\
Number  & \multicolumn{1}{c|}{Correction}                   \\
\hline
 2792   & Changed letter ``l'' in byte 54 to ``+''          \\
 3111   & Changed ``;'' in byte 49 to ``.''                 \\
 2926   & Realigned photometry reference and spectral type  \\
 5913   & Realigned HD number and suffix                    \\
 8120   & Realigned identification fields                   \\
 8146   & Realigned identification fields                   \\
 8259   & Deleted proper motion identification number
          repeated in HD number field                       \\
19370   & Changed HD number from ``137735'' to ``13735''    \\
\hline
\end{tabular}
\end{table}

\end{document}
