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V/97 Updated 3rd Cat Variable Stars in Globular Clusters (Clement+ 1997)
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Preliminary Fourth Edition of the Catalogue on Variable Stars in
Globular Clusters
Clement C.
<unpublished (1997)>
A Third Catalogue of Variable Stars in Globular Clusters Comprising 2119 Entries
Sawyer Hogg H.
<Publications of the David Dunlap Observatory, University of Toronto,
Volume 3, Number 6 (1973)>
=1973PDDO....3....6S
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ADC_Keywords: Stars, variable; Clusters, globular
Description:
This Catalogue is an update to Helen Sawyer Hogg's Third Catalogue
on Variable Stars in Globular Clusters (1973, David Dunlap Observatory
Publications, Volume 3, Number 6). This update is based mainly on
reference cards prepared by Helen Sawyer Hogg from articles published
in the literature in the period 1973 to 1988. There are also some
references entered from more recent literature and we are attempting
to bring the catalogue up to date.
Not all known globular clusters have been included, as the literature
search is not at this point complete.
See also:
http://lepus.astro.utoronto.ca/
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This File
clusters.dat 76 136 Globular Cluster data
variabls.dat 123 2664 Variables in and near Globular Clusters
biblio.dat 146 1621 References to the data
notes.dat 104 101 Remarks and notes
byclustr.txt 112 5850 Data Organized by Cluster
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Byte-by-byte Description of file: clusters.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- clusterID *IAU name
11- 12 I2 h RAh Right Ascension hours
14- 17 F4.1 min RAm RA minutes
20 A1 --- DE- Declination sign
21- 22 I2 deg DEd Declination degrees
24- 25 I2 arcmin DEm Declination arc minutes
27- 32 F6.1 yr Epoch *? =1950.0 epoch of coordinates if not
1950
36- 61 A26 --- name cluster name and other designations
62- 70 A9 --- cluster_ID IAU name with +/- sign for p/m
72- 74 I3 --- Nvar number of variables or any known
variables in or around the cluster
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Note on clusterID:
The name of the file indicates the IAU cluster name, in the format
C####p### or C####m###, where the "p" and "m" indicate plus or minus,
as there may be difficulty in naming files with "-" or "+" on host
systems.
Note on Epoch:
There is some uncertainty about the reliability of the epoch values.
Use them with caution. A future update will resolve this issue.
Byte-by-byte Description of file: variabls.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- clusterID Cluster's IAU name
11- 15 A5 --- var var #, or other id
17- 24 F8.2 arcsec X ? pos x (north) relative to center
27- 34 F8.2 arcsec Y ? pos y (east) of the cluster
35 A1 --- u_Y [: ] uncertainty in Y
37 A1 --- l_max_mag [<> ] limits to maximum magnitude
(usually V or B)
38- 42 F5.2 mag max_mag ? maximum magnitude (unless noted
otherwise)
43- 44 A2 --- u_max_mag [:? ] uncertainty flags
46- 47 A2 --- l_min_mag [> ] upper limit minimum magnitude
48- 52 F5.2 mag min_mag ? minimum magnitude (unless noted
otherwise)
53- 54 A2 --- u_min_mag [: ?] uncertainty flags
56- 65 F10.4 --- epoch ? Epoch(max mag)
66 A1 --- u_epoch [:? ] uncertainty flags
68 A1 --- l_P [> ] upper limit period P
69- 80 F12.8 s P ? Period (in seconds) for long periods
see the remarks
81 A1 --- u_P [: *#] uncertain period flag (#=::)
82-123 A42 --- remarks *pointers to references, names from
objects by authors, variablility,
membership, alternate periods
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Note on remarks:
In the remarks the following abbreviations are used:
+ or - : increasing or decreasing period
var: variable
not var: determined not to be variable
mem: member of the cluster
f: field star
note (1): The visual magnutude data were originally given in mean V
and amplitude but were converted to fit in the table. See the
original data file on the object.
note (2): Epoch is the time of maximum for RR Lyrae and XX PHe and
minimum for the EW variables.
note(3): Not the maximum and minimum visual amplitudes, but mean(B) and
amplitude are given.
Byte-by-byte Description of file: biblio.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- ID IAU name cluster
11-146 A136 --- text *reference and notes pertaining to the reference
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Note on text:
A few new abbreviations are used here in regard to the literature consulted.
They include:
A&SS - Astrophysics and Space Science
CA&A - Chinese Astronomy and Astrophysics
CA - Chinese Astronomy
SA - Soviet Astronomy
SA Lett - Soviet Astronomy Letters
Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- ID IAU name cluster
11-104 A94 --- note notes to the variabls.dat table
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Organization of the information in file byclustr.txt:
This data file is the original data from the author, and organized
by cluster. The file format is first some information about the
cluster (which has been put in table clusters.dat), then the table of
the variables' properties (see the table variabls.dat), followed by
notes about the data (see notes.dat) and references (see references.dat).
The extracted tabular data hopefuly will make searches easier to do.
Please note that not all known globular clusters have been included,
as the literature search is not at this point complete. At the beginnning
of the file is a header containing the cluster name, with multiple
designations shown if they are in common use. Following are the RA and
Dec of the cluster. The RA and Dec are the 1950 coordinates unless
otherwise noted. This is followed by a listing of any known variables
in or around the cluster. This section will be discussed in more detail
elsewhere. Following the variable star listing is a bibliographical listing
of papers related to the cluster. Brief notes accompany each reference to
aid in locating the information desired. The bibliographical references
are sorted approximately chronologically. Due to space limitations the
summary notes are very brief and should only be taken as an indication
of the nature of the article. It should be noted that the references from
approximately 1973 to 1988 are fairly complete and are based on reference
cards prepared by Helen Sawyer Hogg. The literature survey is ongoing.
For references dating back earlier than 1973, one should refer to the 3rd
Catalogue of Variable Stars in Globular Clusters (Sawyer Hogg, 1973) and
the references contained therein.
Variable Star Listing (see also variabls.dat):
This section of the file is set up almost identically to the format of
the previous version of this catalogue. New variables announced between
1973 and 1988 have been assigned a number according to the system in
use in the 3rd Catalogue. They are reported in this section with
numbers that continue from those given in the 3rd Catalogue. Often
this numbering of variables differs from that of the authors, but
this system has been used as the numbering systems used by the authors
of the literature often conflict with each other. Wherever possible,
comments have been made to indicate the reference in which a variable
is first reported and the author's own designation for the variable.
For variables announced after 1988, we have decided, in most cases,
to adopt the authors' nomenclature instead.
The listing gives, in order, the variable number, the position in relation
to the cluster centre in arcseconds north(x") and east(y"), the visual
maximum and minimum magnitudes (Generally in B or V, consult the references
for more information), the epoch of maximum, the period, and then brief
remarks pertaining to the variable. Most of the remarks made about variables
have the same meaning as in the 3rd catalogue. In addition to those
comments, remarks have been made about membership (mem or mem?), and field
variables are indicated as f or f?. Alternate periods are often given in the
remarks column. Individual author's designations for variables are often
given in this column, the references section of each file should be consulted
to aid in identifying these variables. In some cases suspected variables are
included in the list, and usually these variables will have the remark var?
at some point in their individual line entry. In many cases variables have
been reported, only to be shown later not to be variable, these usually have
the comment of "not var" in their entry. Confirmed variables that do not
have known periods or light curves are identified by "var". This listing of
variable stars is not intended to be exhaustive, most known field variables
are not included. If there is confusion as to the identification of a
variable, the literature should be considered the primary source for
acquiring information on these variables.
Suggestions on usage:
In general, the most recent and reliable periods, epochs, magnitudes and the
like are included, but in cases where more than one value was available, a
decision was made as to what data was used in this catalogue. If there is
confusion as to the source of information in this listing, the best thing
to do is to consult the references moving from most recent to earlier papers.
Also, articles with a description along the lines of "elements of variables"
are much more likely to contain the data appearing in these files. Other
papers that will likely contain data on the variables will mention either
photometry of variables or photometry of the cluster. The data used in the
variable star listings was also generally taken from the more commonly
available literature, although this is not always the case. As we continue
our work on the catalogue, we are planning to indicate at the end of each
cluster's table, the main references for the entries in the table.
General Comments on the Catalogue:
Several final comments should be made on the catalogue in general.
1) These data are tentative, as modifications and additions to the
catalogue files are ongoing, and later changes may invalidate earlier
versions of the files.
2) The literature surveyed is only complete to 1988, with some later
references included as time has permitted. Even up to and including
references of 1988, there may be material missing that should be included
in these catalogue files.
3) The numbering of the new variables has been somewhat arbitrary, but a
decision had to be made to allow the variables to be identified in a
consistent fashion. The original literature should be consulted to
obtain definite identifications of new variables.
Historical Remarks:
The catalog was submitted to the ADC by Christine Clement. The
update for 1973 to 1988 was prepared by Tara Rosebery and Quentin
Dufton under the supervision of Christine Clement. A further
update has been prepared by Jay Burford.
The catalog was received by the ADC 16-Apr-1997 in the format closely
matching that of Sawyer Hogg's 3rd Catalogue of Variable Stars in
Globular Clusters. The data were extensively reorganized by P. Kuin
to provide several tables of the basic information in addition to the
data given for each cluster in one single file. The identifyer for each
Globular Cluster was added to the new tables.
Author's Contact Information:
Any questions or queries should be addressed to Christine Clement at
cclement@astro.utoronto.ca who is maintaining the catalogue.
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(End) N.P.M. Kuin [ADC] 29-Oct-1997