Contents of: II/122B/./adc.txt

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                 UBV Photoelectric Photometry Catalogue (1986)



                               (Mermilliod 1987)



                Documentation for the Computer-Readable Version



                                 Anne C. Raugh

                                September 1987



                        Doc. No. STX-T-25-3002-0016-87

                             Contract NAS 5-28752



                                 Prepared for:

                 National Aeronautics and Space Administration

                          Goddard Space Flight Center

                              Greenbelt, MD 20771



                                 Prepared by:

                            ST Systems Corporation

                               4400 Forbes Blvd.

                            Lanham, Maryland 20706





                                   Abstract


   This  document   describes  the   computer-readable  version   of  the   UBV
Photoelectric Photometry Catalogue (1986) (Mermilliod 1987) distributed by  the
Astronomical Data Center, NASA Goddard  Space Flight Center. This catalog  is a
compilation of UBV  photoelectric photometry in  the Johnson and  Morgan system
and in  closely related  systems published  between 1953  and the  end of 1985.
Listed are identification, V, B-V , U-B, number of measurements, and references
for 136,719 entries concerning 87,267 stars.
   The catalog is in seven files:  the first lists data for stars  published in
the  system  of  Johnson  and  Morgan  (1953);  the  second file lists the same
information for measurements in several closely related systems; the third file
combines the data of  the first two into  a single file; the  fourth file lists
the full forms of the references cited by code number in the first three files;
the fifth file contains a list of  the references of the fourth file sorted  by
journal and volume; the sixth file  lists data and additional comments for  933
stars not known to be variable but which have shown a significant difference in
magnitude between two observations; and the seventh file contains a description
of the numbering system of Mermilliod  (1978) used to identify objects in  this
catalog. The  present document  describes the  overall file  structure and  the
individual data fields.





Contents


1    Introduction                                                            2

     1.1    Description ...................................................  2

     1.2    Reference .....................................................  2


2    Structure                                                               2

     2.1    Each File as a Whole ..........................................  2

     2.2    Measurements (Files 1, 2, and 3 of 7) .........................  3

     2.3    References (File 4 of 7) ......................................  5

     2.4    Sorted References (File 5 of 7) ...............................  6

     2.5    Inconsistencies (File 6 of 7) .................................  6

     2.6    Numbering (File 7 of 7) .......................................  7



3    History                                                                 7

     3.1    Remarks and Modifications .....................................  7

     3.2    References to the Documentation ...............................  8


A    Errata                                                                  9



List of Tables


     1      Summary Description of Catalog Files ..........................  3

     2      Measurement Record Format .....................................  4

     3      Reference Record Format .......................................  5

     4      Inconsistencies Record Format .................................  6







                                       1




   1 Introduction

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


   1.1 Description

   The UBV Photoelectric Photometry  Catalogue (1986) (UBV86; Mermilliod  1987)
is a compilation of UBV photoelectric  photometry in the system of Johnson  and
Morgan (1953) and closely related systems published between 1953 and the end of
1985.  Listed  are  identification,  V,  B-V,  U-B, number of measurements, and
references for a total of 136,719 entries concerning 87,267 stars.
   The catalog is in seven files:  the first lists data for stars  published in
the  system  of  Johnson  and  Morgan  (1953);  the  second file lists the same
information  for  measurements  in  closely  related  systems;  the  third file
combines the data of  the first two into  a single file; the  fourth file lists
the full forms of the references cited by code number in the first three files;
the fifth file contains a list of  the references of the fourth file sorted  by
journal and volume; the sixth file  lists data and additional comments for  933
stars not known to be variable but which have shown a significant difference in
magnitude between two observations; and the seventh file contains a description
of the numbering system of Mermilliod  (1978) used to identify objects in  this
catalog.


1.2      Reference

   Mermilliod, J.-C. 1987, Astron. Astrophys. Suppl. Ser., 71, 413.


2       Structure


2.1      Each  File  as  a  Whole

   The UBV86 consists  of seven files.  Table 1 gives  the tape-file attributes
that  are  the  same  no  matter  what  computer the catalog is copied for. All
records are of fixed length. The first file lists measurements in the system of
Johnson  and  Morgan  (1953);  the  second  file  lists measurements in closely
related systems; the third file lists the combined data of the the previous two
(Table 2); the fourth file lists the full forms of the references cited by code
number in the first three files (Table 3); the fifth file lists the  references
sorted by journal and volume number; the sixth file lists data and comments for
stars with inconsistent measurements (Table 4); and the seventh file contains a
description  of  the  numbering  system  of  Mermilliod (1978) used to identify
objects in this catalog.  Detailed descriptions of each  file are given in  the
following sections.
   Quotations in any of the following descriptions come from Mermilliod  (1987)
unless otherwise noted.





                                       2



       ________________________________________________________________
      |         UBV Photoelectric Photometry Catalogue (1986)          |
      |                     (Mermilliod 1987)                          |
      |________________________________________________________________|
      |        |                    |  Record  |  Record  |  Number of |
      |  File  |       Contents     |  Format  |  Length  |   Records  |
      |________|____________________|__________|__________|____________|
      |    1   | Johnson System     |   Fixed  |    48    |   109,294  |
      |    2   | Related Systems    |   Fixed  |    48    |    27,425  |
      |    3   | Merged Data        |   Fixed  |    48    |   136,719  |
      |    4   | References         |   Fixed  |    80    |     4,986  |
      |    5   | Sorted References  |   Fixed  |    80    |     5,215  |
      |    6   | Inconsistencies    |   Fixed  |    80    |     3,703  |
      |    7   | Numbering          |   Fixed  |    80    |     2,462  |
      |________|____________________|__________|__________|____________|

                Table 1:  Summary Description of Catalog Files



   There are also  attributes that will  change from computer  to computer. You
will probably  have to  know these  in order  to use  your copy of the catalog;
therefore, they should have been supplied with your tape. These attributes  are
as follows:

   o Number of tracks
   o Density in bytes per inch
   o Block size in bytes
   o Number of records in a block
   o Number of blocks
   o Character code (ASCII or EBCDIC)

   You may wish to write down the values for your tape in the list above.



   2.2 Measurements (Files 1, 2, and 3 of 7)


   The format for these three files is identical. The first file includes  data
in the standard system of Johnson and Morgan (1953):

       All  data  that  have  been  explicitly  referred to the Johnson and
   Morgan  UBV  system  have  been  considered  as such. The catalogue also
   includes the (U)BV data from the (U)BVRI systems of Kron and Cousins and
   the UBV observations  from Johnson's UBVRI  system when the  observation
   and  reduction  have  been  done  separately  for the UBV and a separate
   number of measurements indicated.

   The  second  file  includes  measurements  "through  UBV  filters in closely
related systems." Mermilliod (1987) lists the follwing sources for these data:





                                       3




   BV data from the UcBV Cape system (Nicolet 1975)

   UBV(E) data from Eggen (Mermilliod and Mermilliod 1986)

   UBV from the various UBVRI systems as compiled by Lanz (1986)

   UBViyz photometry (Jennens and Helfer 1975)


   The third file contains the merged data of the first two files.

            ______________________________________________________
           |         |         |  Suggested  |                    |
           |  Bytes  |  Units  |    Format   |       Data         |
           |_________|_________|_____________|____________________|
           |   1-11  |         |     I11     | Identification     |
           |    12   |         |     A1      | Multiplicity flag  |
           |    13   |         |     A1      | Variability flag   |
           |  14-20  |   mag   |     F7.3    | V                  |
           |  21-27  |   mag   |     F7.3    | B-V                |
           |  28-34  |   mag   |     F7.3    | U-B                |
           |  35-36  |         |     2X      | Blank              |
           |    37   |         |     A1      | Count flag         |
           |  38-40  |         |     A3      | Number of obs.     |
           |  41-43  |         |     3X      | Blank              |
           |  44-48  |         |     I5      | Reference number   |
           |_________|_________|_____________|____________________|

                      Table 2:  Measurement Record Format


Identification     Code number of the star  in the system of Mermilliod  (1978)
                   [bytes 1-11, format I11]

Multiplicity flag  Single-character code:   "D" indicates an  unresolved binary
                   system;  a  number  identifies  one  component of a multiple
                   system [byte 12, format A1]

Variability flag   "V" if the star is variable [byte 13, format A1]

V                  In magnitudes [bytes 14-20, format F7.3]

B-V                In magnitudes [bytes 21-27, format F7.3]

U-B                In magnitudes [bytes 28-34, format F7.3]

Count flag         Single-character code qualifying the number in bytes  38-40.
                   The following codes are used:

                    /   Indicates that  the actual  number of  observations was
                        not  listed  in  the  source  reference;  "1"  has been
                        assumed.


                                       4




                    *   Indicates that there were at least as many observations
                        as indicated in bytes 38-40.

                    [byte 37, format A1]

Number of obs.     Number of  observations of  this object.  For standard stars
                   this field contains instead the letters "STD." [bytes 38-40,
                   format A3]

Reference number   Code number of the source  reference of this data. The  full
                   forms of these references are  listed by code number in  the
                   fourth file, and by journal  and volume number in the  fifth
                   file.  References  for  the  "related  systems" listed above
                   begin with a two-digit prefix:

                   02XXX   BV, Cape (Nicolet 1975)

                   14XXX   UBV, Eggen (Mermilliod and Mermilliod 1986)

                   37XXX   UBViyz, Jennens and Helfer (1975)

                   08XXX   UBV(RI), Johnson standards (Johnson and Morgan 1953)

                   68XXX   UBV(RI), Kunkel and Rydgren (1979)

                   72XXX   UBV(RI), Moffet and Barnes (1979)

                   73XXX   UBV(RI), Neckel and Chini (1980)

                   [bytes 44-48, format I5]


   2.3 References (File 4 of 7)

   This file lists the full forms of the references cited by code number in the
first three files, sorted by number. Each reference has three or more  records:
the first record contains the  reference number and authors; the  second record
holds  the  year,  journal  name,  volume  and  page  number; and the third and
following records contain the full title of the paper.

                     ____________________________________
                    |         |  Suggested  |            |
                    |  Bytes  |   Format    |    Data    |
                    |_________|_____________|____________|
                    |   1- 5  |     I5      | Number     |
                    |   6- 8  |     3X      | Blank      |
                    |   9-80  |     A72     | Text       |
                    |_________|_____________|____________|

                       Table 3:  Reference Record Format

Number             Code number  by which  this reference  is cited  in the data
                   files [bytes 1-5, format I5]


                                       5




Text               Full form of the reference.  When bytes 1-5 are blank,  this
                   field continues the reference of the previous record. [bytes
                   9-80, format A72]


   2.4 Sorted References (File 5 of 7)

   This file contains  a list of  the references of  the fourth file  sorted by
journal and volume  number and includes  header records to  separate references
from different  journals. This  file is  useful for  determining the  reference
number assigned  to a  given paper.  It is  formatted as  80-byte lines of text
which may be read and printed out with a FORTRAN A80 format.


   2.5 Inconsistencies (File 6 of 7)

   This file lists  data for those  stars not known  to be variable,  but which
show a difference of >0.20 mag in V, B-V , or U-B between two or more different
sources. All  observations are  listed for  each of  933 stars.  A blank record
separates successive objects.


            ______________________________________________________
           |         |         |  Suggested  |                    |
           |  Bytes  |  Units  |    Format   |       Data         |
           |_________|_________|_____________|____________________|
           |   1-11  |         |     I11     |  Identification    |
           |    12   |         |     A1      |  Multiplicity flag |
           |  13-19  |   mag   |     F7.3    |  V                 |
           |  20-26  |   mag   |     F7.3    |  B-V               |
           |  27-33  |   mag   |     F7.3    |  U-B               |
           |    34   |         |     1X      |  Blank             |
           |    35   |         |     A1      |  Count flag        |
           |  36-38  |         |     A3      |  Number of obs.    |
           |  39-40  |         |     2X      |  Blank             |
           |  41-45  |         |     I5      |  Reference number  |
           |    46   |         |     1X      |  Blank             |
           |    47   |         |     A1      |  Error flag        |
           |    48   |         |     1X      |  Blank             |
           |  49-80  |         |     A32     |  Comment           |
           |_________|_________|_____________|____________________|

                    Table 4:  Inconsistencies Record Format


Identification     Code number of the star  in the system of Mermilliod  (1978)
                   [bytes 1-11, format I11]

Multiplicity flag  Single-character code:  "D" indicates  an unresolved  binary
                   system; a num-  ber identifies one  component of a  multiple
                   system [byte 12, format A1]

V                  In magnitudes [bytes 13-19, format F7.3]


                                       6




B-V                In magnitudes [bytes 20-26, format F7.3]

U-B                In magnitudes [bytes 27-33, format F7.3]

Count flag         Single-character code qualifying the number in bytes 36-38.  The following
                   codes are used:

                    /   Indicates that  the actual  number of  observations was
                        not  listed  in  the  source  reference;  "1"  has been
                        assumed.

                    *   Indicates that there were at least as many observations
                        as indicated in bytes 36-38.

                    [byte 35, format A1]


Number of obs.     Number of  observations of  this object.  For standard stars
                   this field contains instead the letters "STD." [bytes 36-38,
                   format A3]

Reference number   Code number of the source  reference of this data. The  full
                   forms of these references are  listed by code number in  the
                   fourth file, and by journal  and volume number in the  fifth
                   file. [bytes 41-45, format I5]

Error flag         "*"  indicates  that  the  data  of  this  record  have been
                   identified as faulty. [byte 47, format A1]

Comment            [bytes 49-80, format A32]


   2.6 Numbering (File 7 of 7)

   This  file  contains  a  description  of  the numbering system of Mermilliod
(1978) used to identify objects in this catalog. It includes references as well
as a number of tables listing special code numbers, and is formatted as 80-byte
lines of text which may be read and printed out with a FORTRAN A80 format.
   Two ranges of object numbers not defined in this file are described below.

    -40ZZBBBBB     These numbers represent CpD stars in the zones north of  -52
                   degrees where CoD numbers  are normally expected, but  which
                   have no CoD number. ZZ = zone number, BBBBB = star number.

    -20ZZBBBB      These numbers represent CoD stars in the zones south of  -51
                   degrees where CpD numbers  are normally expected, but  which
                   have no CpD number. ZZ = zone number, BBBB = star number.








                                       7




3       History


3.1      Remarks  and  Modifications

   The UBV Photoelectric  Photometry Catalogue (1986)  (UBV86) was received  by
the Astronomical Data Center (ADC), NASA Goddard Space Flight Center, from  the
Centre de Donnees Astronomiques, Strasbourg (CDS), in December 1986.
   The original  tape consisted  of eight  text files.   The  first contained a
description of  the seven  catalog files  and has  been incorporated  into this
document; the  remaining files  were formatted  as described  in the  preceding
sections.
   A FORTRAN program was run to  check the validity of each field  according to
its data  type and  value.   A number  of errors  were discovered, only some of
which could be corrected.  A list of all errors and corrections is included  in
Appendix A:  "Errata."


   3.2 References to the Documentation

   Jennens, P. A.  and Helfer, H.  L. 1975, Mon.  Not. Roy. Astron.  Soc., 172,
       667.

   Johnson, H. L. and Morgan, W. W. 1953, Astrophys. J., 117, 313.

   Kunkel, W. E. and Rydgren, A. E. 1979, Astron. J., 84, 633.

   Lanz, T. 1986, Astron. Astrophys. Suppl. Ser., 65, 195.

   Mermilliod, J.-C. 1987, Astron. Astrophys. Suppl. Ser., 71, 413.

   Mermilliod, J.-C. 1986, unpublished documentation supplied with the  catalog
       by the CDS.

   Mermilliod, J.-C. 1978, Bull. Inform. CDS, 14, 32.

   Mermilliod, J.-C. and Mermilliod, M. 1986, in preparation.

   Mermilliod, J.-C. 1987, private communication.

   Moffett, T. J. and Barnes, T. G. 1979, Astron. J., 84, 627.

   Neckel, Th. and Chini, R. 1980, Astron. Astrophys. Suppl. Ser., 39, 411.

   Nicolet, B. 1975, Astron. Astrophys. Suppl. Ser., 22, 239.







                                       8





A        Errata

   During preparation of the data several typographical errors were  discovered
in the first three  files which were corrected  where possible by referring  to
the indicated source reference. The following records were found to be in error
in the first file (Johnson system data file). In all cases the identical errors
were discovered  in the  corresponding record  of the  third file  (merged data
file):

 _____________________________________________________________________________
|  Johnson  |  Merged  |                                                      |
|  Record   |  Record  |                     Error and Correction             |
|  Number   |  Number  |                                                      |
|___________|__________|______________________________________________________|
|    2350   |    2488  |  Number of observations field blank.  The value from |
|           |          |  the reference ("8") was inserted.                   |
|___________|__________|______________________________________________________|
|    7695   |    8929  |  V, B-V, U-V, and number of observations misaligned. |
|           |          |  The numbers  present were  realigned. However,  the |
|           |          |  value for V (.01 mag) is not reasonable. The object |
|           |          |  could not  be located  in the  indicated reference. |
|           |          |  The value listed for V in the Bonner Durchmusterung |
|           |          |  is 9.5; V in this catalog has not been changed.     |
|___________|__________|______________________________________________________|
|   11414   |   13065  |  Reference  number  of  "0".  References  1-10  were |
|           |          |  checked, but  the object  could not  be found. This |
|           |          |  field was left unchanged.                           |
|___________|__________|______________________________________________________|
|   61036   |   81238  |  Typographical error in B-V. The object was found in |
|           |          |  the indicated reference and the value changed  from |
|           |          |  "9.966" to "0.966".                                 |
|___________|__________|______________________________________________________|
|   83783   |  106937  |  Non-existent reference number. The object was found |
|           |          |  in  reference  390.  Reference  number changed from |
|           |          |  "3900" to "390".
|___________|__________|______________________________________________________|
|   83784   |  106938  |  Non-existent reference number. The reference number |
|           |          |  has  been  changed  from  "4010"  to "401", but the |
|           |          |  object  could  not  be  located  in this reference. |
|           |          |  References  401-411  were  also  checked  for  this |
|           |          |  object, without success.                            |
|___________|__________|______________________________________________________|
|   83785   |  106939  |  Non-existent reference number. The object was found |
|           |          |  in  reference  411.  Reference  number changed from |
|           |          |  "4110" to "411".                                    |
|___________|__________|______________________________________________________|
|   91036   |  116341  | Number of observations blank. The object was found   |
|           |          | in the indicated reference and the value "3" was     |
|           |          | inserted into this field.                            |
|___________|__________|______________________________________________________|
|  104618   |  130715  | B-V value unreasonable ("18.12"). The reference was  |
|           |          | consulted and it was discovered that this is         |
|           |          | actually the B magnitude, not B-V. The subtraction   |
|           |          | was performed and the field changed to "-0.29".      |
|___________|__________|______________________________________________________|
                                       9




   In addition, the following  record was found to  be in error in  the file of
related system measurements:

 _____________________________________________________________________________
|  Related  |  Merged  |                                                      |
|  Record   |  Record  |                 Error and Correction                 |
|  Number   |  Number  |                                                      |
|___________|__________|______________________________________________________|
|   14822   |   60194  |  Misaligned data and non-existent reference  number. |
|           |          |  The object  was found  in reference  8015. The data |
|           |          |  were  re-aligned  and  the  reference  number   was |
|           |          |  changed from "80150" to "8015".                     |
|___________|__________|______________________________________________________|


   Finally, during the course of  checking out these problems, two  errors were
also discovered in the reference files. No attempt has been made to verify  the
references in these files, but those errors encountered incidentally are listed
below. The corrections have been made in both reference files.

 _____________________________________________________________________________
|  Reference  |                                                               |
|   Number    |               Error and Correction                            |
|_____________|_______________________________________________________________|
|    100      |  Page number changed from "223" to "221".                     |
|_____________|_______________________________________________________________|
|   1464      |  Page  number  changed  from "1272" to "254".  ("1272" is the |
|             |  number of the issue.)                                        |                                          |
|_____________|_______________________________________________________________|






















                                      10

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