Contents of: VII/92A/./intro

The following document lists the file intro from catalogue VII/92A.
A plain copy of the file (without headers/trailers) may be downloaded.


                         Catalogue of Open Cluster Data
                         ______________________________

                           5th edition, February 1987


    This is a computer readable catalogue of open cluster data compiled by Gosta
Lynga, Lund Observatory, Box 43, S-221 00 Lund, Sweden.  It is distributed by
the Stellar Data Centre, Observatoire de Strasbourg 11 rue de l'Universite, F-67
000 Strasbourg, France and by World Data Center A, Goddard Space Flight Center,
Code 630.2, Greenbelt, Maryland 20771, USA.

    The following description of the machine-readable version of the "Catalogue
of Open Cluster Data, 5th Edition" is based on the documentation received by
Gosta Lynga in 1987.  Additional comments and revisions have since been made to
his description.  These changes were warrented because of the format
modifications made to the catalogue data, mainly files 2 and 5. These particular
files are now in a computer readable format.  Files 2 and 4, however, remain
strictly print files.

FILE 1. Introduction and description:

                                            Record Length     Number of Records
      File 1. Introduction (this file)          80                  609
      File 2. Catalogue Print File             132                 8640
      File 3. Reference File                   132                  670
      File 4. Alias File                       132                 2040
      File 5. Galactic Coordinate File          54                 1111
      File 6. Catalogue Data File              132                 4848

    The aim of this catalogue is to give salient data for all known open star
clusters in our galaxy.  As far as possible only published data values have been
quoted; for some of the parameters these values have been selected from
references, which are listed.

    In the fifth edition some minor updates have been made from the fourth
edition.  The main difference between the fifth edition and the fourth is the
merging of the data resulting from a joint project between K. Janes, C. Duke and
Lynga (the paper, which is in preparation, is referred to as jdl).  The aim of
that project was to discuss properties of the open cluster system by using
existing data and by taking their accuracy into proper regard.  Thus the data
were assessed (mostly by Janes), weights assigned and weighted mean values
derived of reddenings, turn-off colours and distances.  These data have been
entered into files 2 and 6 and the references used have been merged into file 3.
Lines 35-38 refer to these entries of file 3.

    As before, file 6 contains all the material of the catalogue whereas the
table (file 2) only contains the most essential items.  Files 1, 2, and 4 are
page oriented and thus adapted for microfiche and print-out use while file 6
contains one record of 528 bytes for each cluster; in order to allow use of
programs developed for the fourth edition the same byte numbers have been kept
for bytes 1- 462.  Also the old cluster locations have been kept for the sake of
consistency.  The drawback of this is that some locations are empty - they are
then filled with blanks.

    The definitions of the data values are in most cases unambiguous.  However,
the following points should be clarified.  The line numbers refer to the page
oriented catalogue of file 2.

    CLUSTER DIAMETER.  In the literature some quite convincing cases have been
made for the existence of large coronas around open clusters.  This may be a
general phenomenon, although for most clusters only the diameter of the cluster
nucleus is known.  For reasons of homogeneity, this is used even when the
existence of a cluster corona is likely.  For most clusters two values of the
angular diameter are given.  Estimates from survey prints (line 22 in file 2)
should form a reasonably homogeneous sample.  Line 23 contains the most
reliable, often the only, value available in the literature.  The linear
diameter given in line 58 assumes the jdl distance of line 25, if available, or
the selected distance of line 26.  The angular diameter of line 22 is used.

    The jdl distance with corresponding weight is given in line 25.  Line 26
contains the most accurate single determination of the distance with
corresponding reference number.

    Line 29 contains the turn-off colour and the corresponding weight.  In line
30 the age derived from the turn-off colour is given.  All this information is
from jdl.  The most accurate log(age) determination from the literature is given
in line 31 together with corresponding reference number.

    INTERSTELLAR EXTINCTION.  Contrary to earlier editions the observed
reddening value is now given rather than the derived extinction.  The jdl data
with weights are given in line 27.  The letter 'v' means that there is variable
reddening over the cluster.

    METALLICITY.  The abundance values were discussed by jdl and an attempt was
made to put them on a homogeneous system.  The resulting value is entered in
line 32.

    RADIAL VELOCITIES.  The data for cluster radial velocities have been
collected by Dr.  S. Wramdemark of Lund Observatory (ref 520).  They represent
weighted mean values for member stars velocities as published up to 1980.  The
weighting procedure takes into account the number of stars in the cluster for
which radial velocity had been measured, the accuracy (Wilson class) for each
stellar radial velocity and the calculated imprecision in the mean radial
velocity for the cluster.  Five weight classes are identified by w= 1, 2, 3, 4
and 5 in order of increasing precision.

    INTEGRATED PROPERTIES.  The total V magnitude and the integrated B-V colour
have been calculated by mr.  B. Skiff (ref 422), Flagstaff, Arizona, using
available photometric data.  The number of observed stars used is sometimes
different from estimates of membership from survey charts.  Reasons for such
differences can be inclusions of non-members or limited resolution on the survey
charts.  Skiff's data are given in lines 50-52.  The richness class of line 53
is from Janes and Adler (ref 265).



FILE 2. Catalogue Print File:

    Each page contains eight columns, one for each cluster.  The clusters are
arranged according to right ascension for 1950.0.

The following information is given in the different lines:

    4    Cluster notation according to the system accepted by the International
         Astronomical Union in Montreal 1979
 5- 6    Traditional sequence name and number
    7    OCL number (19) and number in File 6 of present catalogue
 9-11    Equatorial coordinates for 1950.0 and precession values for ten years
12-13    Galactic coordinates as calculated
   15    Sky survey used for examination of cluster
   16    Type and number of the sky survey chart
   17    Coordinates for the centre of the chart
   18    X/Y coordinates for the cluster on the chart
   20    Trumpler (463) class with the following notation:
              concentration
                I   detached, strong concentration
                II  detached, slight concentration
                III detached, no concentration
                IV  not detached
              range of brightness
                1   most stars of nearly the same brightness
                2   medium range in brightness
                3   bright and faint stars in the cluster
              richness
                vp  very poor
                p   poor
                m   medium
                r   rich
                vr  very rich
              nebulosity
                n   cluster is involved in nebulosity
   21    Membership number as estimated from sky survey print (321)
   22    Angular diameter as estimated from sky survey prints (321)
   23    Selected angular diameter, reference in file 3.
   25    Mean distance with weight class (jdl)
   26    Selected distance value, reference in file 3..
   27    Reddening with weight class (jdl); v indicates varying reddening
   29    jdl turn-off colour and weight class
   30    log (age) derived from turn-off colour (jdl)
   31    Selected log(age) value, reference in file 3.
   32    Fe/H  on the scale defined by jdl.
   33    Radial velocity with weight.
35-38    Numbers of reference in file 3, which are used to derive the jdl data.
40-44    The number of members that belong to particular star types. These
         data have been collected by Dr. A. Feinstein of La Plata Observatory.
                The following star types have been noted:
                  Ap stars
                  Am stars
                  marginal Ap stars
                  marginal Am stars
                  WR stars
                  Of stars
                  Be stars
                  Shell stars
                  Be+Shell stars
                  He weak stars
                  He rich stars
                  Cepheids
                  Planetary nebulae
                  Carbon stars
                  Long period variables
                  Delta Sct stars
                  Beta Cep stars
                  R Cor Bor stars
                  Ba II stars
                  U Gem stars
46-48    Literature references for the peculiar star data as quoted in file 3.
   50    Total magnitude of cluster (422)
   51    Integrated B-V (422)
   52    Number of observed stars (422)
   53    Richness class (265)
   55    Earliest spectral class for a cluster member, (50) and (37)
   56    Magnitude of the brightest cluster member (50)
   57    Galactocentric distance (pc) and distance (pc) above the formal
         galactic plane
   58    Linear diameter (pc) using jdl distance and estimated angular diameter
   59    Comments, mainly on whether a cluster has been considered dubious by
         reference 19 or 320. If considered  dubious  by  both  these
         references, the cluster has been removed from the catalogue


FILE 3. Reference File:

    The organisation of the reference section has been reconsidered and instead
of the division in different section, file 3 now contains all references in
alphabetical order.  Each reference is formatted to 264 characters, i.e.
suitable for print-out with 132 characters per line.  The sequential numbers are
stored in the relevant places of files 2 and 6. Naturally, these numbers are
only valid inside this edition.

     The following is the format for the Reference file:

           Bytes             Description

            1-  4            Reference Number. A blank in this
                             field indicates a continuation of
                             the previous record
                5            Blank
            6-132            Full reference


FILE 4. Alias File:

    The alias listing is arranged in right ascension.  Cluster names and OCL
numbers are given as well as alternative names that have been used.  Comments
are also given as to identity of clusters in relation to other neighbouring
clusters.  Comments from the NGC catalogue are included for NGC clusters.  This
file also gives information on some clusters which have been considered doubtful
by two independent sources, and which thus have been cancelled as entries in the
catalogue.

    At the end of the alias listing there is a cross reference table for
clusters which have more than one name in addition to the IAU notation.


FILE 5. Galactic Coordinate File:

    The following table describes the format of this file, sorted by increasing
galactic longitude.  (Also note that it is in order of increasing OCL number).
The orginal format was in tabular form, having two columns per page.  The
columns were appended in order to allow computer readability.


           Bytes        Format           Description

            1- 8         F8.2            Galactic Longitude
            9-16         F8.2            Galactic Latitude
              17         1X              Blank
           18-21         I4              OCL number
           22-23         2X              Blank
           24-32         A9              IAU Number
           33-34         2X              Blank
           35-49         A15             Cluster Notation
              50         1X              Blank
           51-54         I4              Number on Lund Disk


    CLUSTER NOTATION.  When this is the NGC number, it is in the follow format
(bytes 35-42) NGC nnnn.


FILE 6. Catalogue Data File:

    This file is the most comprehensive one, being a direct copy of the Lund
disc file at the time of submitting the present version to the CDS and NASA data
centres.  This catalogue contains information about one cluster in each group of
four lines i.e. 528 bytes.  The contents of the first 462 bytes are on the same
format as was used for the fourth edition; this will allow the use of the same
reading program.  However, bytes 463-520 contain new data, resulting from the
jdl investigation.

    The following is a listing of catalogue contents, which notes the formats
and byte numbers in file 6 and the names and storage positions in the Lund data
base; references are made to equivalences inside the four matrices used there:
rda, ref, isd and name.

First  line: item number       format        byte at start        description
Second line:                   field         equivalence          acronym

1       I2      1          sequence code
        1,2     isd 1   seq
2       I4      3          number inside sequence
        3-6     isd 2   num
3       I3      7          RA, 2000.0, hours
4       F4.1    10         RA, 2000.0, minutes
5       I3      14         Dec, 2000.0, degrees
6       I2      17         Dec, 2000.0, minutes
7       I3      19         RA, 1950.0, hours
        19-21
8       F4.1    22         RA, 1950.0, minutes
        22-25   rda 1   alf (radians)
9       I3      26         dec, 1950.0, degrees
        26-28
10      I2      29         dec, 1950.0, minutes
        29-30   rda 2   del (radians)
11      F4.2    31         precession, 10 years, ra, minutes of time
        31-34   rda 3   pra (radians)
12      F4.1    35         precession, 10 years, dec, minutes of arc
        35-38   rda 4   prd (radians)
13      F6.2    39         galactic longitude, degrees
        39-44   rda 5   lon (radians)
14      F6.2    45         galactic latitude, degrees
        45-50   rda 6   lat (radians)
15      I4      51         record number on Lund disc (first record is No.0)
16      I4      55         OCL number (19)
        55-58   isd 3   OCL
21      F6.1    59         angular diameter, min of arc
        59-64   rda 7   ang (radians)
22      I4      65         reference for angular diameter
        65-68   ref 1   rad
23      I4      69         distance, pc
        69-72   isd 4   dis
24      I4      74         reference for distance
        73-76   ref 2   rdi
25      F5.2    77         log (age), years
        77-81   rda 8   age
26      I3      82         reference for age
        82-84   ref 3   rag
27      F5.2    85         metallicity, log (Fe/H) - log (Fe/H) for sun
        85-89   rda 9   met
28      I3      90         reference for metallicity
        90-92   ref 4   rme
29      F6.2    93         reddening, E(B-V)
        93-98   rda 10  ext
30      I2      98         reference for reddening
        99-100  ref 5   rex
39      A2      101        indication=1 if cluster has been considered doubtful
                                     =2 if cluster has been considered globular
        101,102 isd 5   typ
40      I2      103        reference for entry 39 (19 or 321)
        103,104 ref 6   rty
51-70                      numbers of peculiar stars (Feinstein)
51      I2      105        Ap stars
        105,106 isd 6   aps
52      I2      107        Am stars
        107,108 isd 7   ams
53      I2      109        marginal Ap stars
        109,110 isd 8   apm
54      I2      111        marginal Am stars
        111,112 isd 9   amm
55      I2      113        WR stars
        113,114 isd 10  wrs
56      I2      115        Of stars
        115,116 isd 11  ofs
57      I2      117        Be stars
        117,118 isd 12  bes
58      I2      119        Shell stars
        119,120 isd 13  shs
59      I2      121        Be+Shell stars
        121,122 isd 14  bsh
60      I2      123        He weak stars
        123,124 isd 15  hew
61      I2      125        He rich stars
        125,126 isd 16  her
62      I2      127        Cepheids
        127,128 isd 17  cep
63      I2      129        Planetary nebulae
        129,130 isd 18  pla
64      I2      131        Carbon stars
        131,132 isd 19  car
65      I2      133        Long period variable stars
        133,134 isd 20  lpv
66      I2      135        Delta Scuti stars
        135,136 isd 21  dsc
67      I2      137        Beta Cephei stars
        137,138 isd 22  bce
68      I2      139        R Cor Bor stars
        139,140 isd 23  rcb
69      I2      141        Ba II stars
        141,142 isd 24  bII
70      I2      143        U Geminorum stars
        143,144 isd 25  uge
71-75   5I4     145        references for entries 51-70
76-90                      part of Dixon's catalogue of non-stellar objects (128
        145-148 ref 7   rp1
        149-152 ref 8   rp2
        153-156 ref 9   rp3
        157-160 ref 10  rp4
        161-164 ref 11  rp5
76      A2      165        POSS chart type (So/O/E=1/2/3)
77      I4      167        POSS chart number
78-80   2I3,I4  171        POSS chart RA,Dec
81-82   2I3     181        position on POSS chart, mm
83      I4      187        max angular diam, min of arc
84      F4.1    191        mag brightest star
85-87                      Trumpler classification
85      I2      195        concentration class
        195,196 isd 26  tr1
86      I2      197        range class
        197,198 isd 27  tr2
87      A2      199        richness class
        199,200 isd 28  tr3
88      A2      201        nebulosity (n/u/e=1/2/3)
        201,202 isd 29  tr4
89      I2      203        indication=1 if cluster is in ref (128)
90      I2      205        indication=1 if cluster has POSS data in ref (128)
91-100                     part of Strasbourg-Bochum file (50):
91      I4      207        selected angular diam, min of arc
92      I4      211        distance, pc
93      F4.1    215        mag, brightest star
        215-218 rda 11  mbr
94      I6      219        spectral class code
        219-224 isd 30  spc
96      F4.1    225        total mag
        225-228 rda 12  tot
98      F4.2    229        colour excess
100     I2      233        indication=1 if cluster is in ref (50)
118-120                    data received from B. Skiff (422)
118     F4.1    235        total magnitude
        235-238 rda 13  bst
119     F4.2    239        integrated B-V
        239-242 rda 14  bsi
120     I4      243        number of stars considered
        243-246 isd 31  bsn
121-145                    data received from K. Janes (265):
121     I4      247        Janes-Adler star number
        247-250 isd 32  jan
122     I2      251        Janes-Adler class
        251,252 isd 33  jac
123     I4      253        Janes-Adler references
140     I2      257        Janes-Adler maximum class
        257,258 isd 34  jam
141     I2      259        Janes-Adler richness class
        259,260 isd 35  jar
142     F4.2    261        Janes-Adler E(B-V)
        261-264 rda 15  jae
143     I4      265        Janes-Adler ref for E(B-V)
        265-268 ref 12  ree
144     F4.2    269        Janes-Adler (B-V) turn-off
        269-272 rda 16  jat
145     I4      273        Janes-Adler ref for (B-V) turn-off
        273-276 ref 13  ret
163-177                    results of 1982 examination (320)
163     I2      277        Trumpler concentration class
        277,278 isd 36  tra
164     I2      279        Trumpler range class
        279,280 isd 37  trb
165     A2      281        Trumpler richness class
        281,282 isd 38  trc
166     A2      283        nebulosity
        283,284 isd 39  trd
167     I4      285        number of member stars
        285-288 isd 40  lyn
168     F6.1    289        angular diameter
        289-294 rda 17  lyd (radians)
169-175                    chart used by Lynga (320) or, if not in that survey,
169     A2      295        survey chart type (SO/O/E/J/R/I/SR= 1/2/3/4/5/6/7; 1/
        295,296 isd 41  cht
170     I4      297        chart number
        297-300 isd 42  chn
171-173 2I3,I4  301        chart RA,Dec
        301-310 isd 43  chr
                isd 44  cha
                isd 45  chd
174     I3      311        distance x from left edge of chart, mm
        311-313 isd 46  chx
175     I3      314        distance y from bottom edge of chart, mm
        314-316 isd 47  chy
176     I2      317        indication = 1 if cluster was classified in ref (320)
        317,318 isd 48  lyc
177     I2      319        indication = 1 if cluster is on eso/serc survey
178     F4.1    321        weights for radial velocity
        321-324 rda 18  rvw
182     I4      325        radial velocity (520), km/s
        325-328 isd 49   rve
183     I2      329        weight class for radial velocity
        329,330 isd 50  rvc
184-188 5I4     331        references for radial velocities
        331-350 ref 14  rr1
                ref 15  rr2
                ref 16  rr3
                ref 17  rr4
                ref 18  rr5
201-208                    Buscombe compilation (64):
201     I4      351        radial velocity, km/s
202     I4      355        distance, pc
203     F4.2    359        E(B-V), mag
204     F4.1    363        integrated app. mag.(pg), mag
205     F4.1    367        integrated abs. mag.(B), mag
206     I4      371        diameter, pc
207     F4.2    375        age, log (T), years
208     F4.2    379        mass, log (M), solar masses
209     F2      383        indication=1 if cluster is in ref(64)
210-217                    Basel data (37):
210     A2      385        photometric system for following data
211     F4.2    387        colour excess
212     F4.2    391        interstellar extinction, mag
213     I4      395        distance, pc
214     I6      399        spectral type of hottest star
        399-404 isd 51  sph
215     I6      405        colour type of bluest star
        405-410 isd 52  spb
216     F6.1    411        cluster diameter, pc
217     I2      417        type of observation
218     I2      419        indication=1 if cluster is in ref (37)
220-221                    van den Bergh-Hagen data(487):
220     F4.1    421        diameter, min of arc
221     A2      425        richness: 1=vp, 2=p, 3=m, 4=r, 5=vr
222     I2      427        indication=1 if cluster is in ref (487)
231-238                    digits for cluster number
        A1      430        the letter C
231-234 A4      431        digits for RA
        431-433
235     A1      434        sign of Dec
        434
236-238 A3      435        digits for Dec
        431-438 char*8 name
239-255                    various tracers:
239     I4      439        -RA, 1950.0
        439-442 isd 53  qrn
241     I4      443        -longitude
        443-446 isd 54  qln
243     I4      447        -number in sequence
        447-450 isd 55  qnn
249     I4      451        +RA, 1950.0
        451-454 isd 56  qrp
251     I4      455        +longitude
        455-458 isd 57  qlp
253     I4      459        +number in sequence
        459-462 isd 58  qnp
        F6.2    463        jdl distance modulus
        463-468 rda 22  ddi
        I2      469               weight class
        469-470 isd 60  iqd
        F5.2    471        jdl turn-off colour
        471-475 rda 23  dto
        F6.0    476        jdl derived age
        476-481 rda 34  qq8
        I2      482               weight class
        482-483 isd 61  iqt
        F5.2    484        jdl reddening
        484-488 rda 21  dex
        A1      489        'v' if reddening varies
        489     isd 62  iqv
        I2      490               weight class
        490-491 isd 59  iqe
        F5.2    492        jdl abundance value
        492-496 rda 35  qq9
        8I3     497        references for jdl input
        497-520 ref 20-27 rj1-rj8
        A8      521        '       +' end of record marker
        521-528 ---     ---


Sequence code and record number for first cluster in sequence:

1  NGC         13
2  IC          60
3  Berkeley     8
4  Czernik      7
5  Dolidze    923
6  Collinder   58
7  Upgren     621
8  Tombaugh   279
9  Ruprecht   236
10 King        11
11 Stock      896
13 Trumpler    48
14 Markarian   79
16 Haffner    286
17 Hogg       523
18 Sher       569
19 Feinstein  573
20 Harward    615
21 Lynga      650
22 Westerlund 724
23 Basel      861
24 Blanco       5
25 Baractova  968
26 Biurakan   922
27 Melotte    106
28 Pismis     443
30 Trapezium  188
32 Pleiades   117
33 Graff      849
34 Iskudarian 860
35 Stephenson 870
36 Roslund    904
37 Hyades     128
41 van den Bergh-Hagen 1055
42 Bochum    1124
43 Dolidze-Dzimselejsvili 596
45 Antalova  1208
46 Moffat    1141
47 Havlen-Moffat 1142
48 Frolov    1143
50 van den Bergh 238
51 Mayer     1155
52 Latysev   1157
53 Sigma Ori 1158
54 Graham    1175
55 Aveni-Hunter 1153
56 Loden     1167
57 Grasdalen 1207
58 Waterloo   486
59 Auner      379
61 Schuster  1210
62 Danks     1211
63 Muzzio     496


The following acknowledgement was included with the orginal documentation:

    I am grateful to my collaborators professor K. Janes and Miss Christine Duke
for allowing me to enter data from our joint paper prior to publication.  I am
also grateful to all those colleagues who have discussed the catalogue with me
and given me a number of valuable suggestions.

                            Lund, February 1987
                            Gosta Lynga




Susan E. Gessner, ST Systems Corp.
National Space Science Data Center
NASA, Goddard Space Flight Center

© UDS/CNRS

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