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