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GLOBCLUST: Help

GLOBCLUST - Milky Way Globular Clusters Catalog (February 2003 Version)


Overview

This is the Catalog of Parameters for Milky Way Globular Clusters (February 2003 Version) that was compiled by William E. Harris of McMaster University. It contains basic parameters on distances, velocities, metallicities, luminosities, colors, and dynamical parameters for 150 objects that are regarded as globular clusters in the Milky Way galaxy.

Please acknowledge the use of this catalog in any published work you derive from it. The proper reference to the literature is the published paper (Harris, W.E. 1996, AJ, 112, 1487) which briefly describes the setup of the catalog. The author would also greatly appreciate receiving any new information, in published or preprint form, which would help him to keep the list up to date (contact W. E. Harris at harris@physics.mcmaster.ca).

A full discussion of the sources used in the creation of this catalog and of the parameters that it contains can be found in the file: http://www.physics.mcmaster.ca/~harris/mwgc.ref


Catalog Bibcode

1996AJ....112.1487H

References

This is the February 2003 updated version of the Catalog of Parameters for Milky Way Globular Clusters. The original published reference for this catalog is:
A catalog of parameters for globular clusters in the Milky Way
     Harris W.E.
    <Astron. J. 112, 1487 (1996)>
    =1996AJ....112.1487H        (SIMBAD/NED BibCode)

Provenance

This database was created by the HEASARC in May 2007 based on an electronic version (dated February 2003) copied from the file http://www.physics.mcmaster.ca/~harris/mwgc.dat

Notice

THE DATA IN THIS CATALOG ARE SUPPLIED FREE OF CHARGE TO ALL USERS. ANY THIRD PARTY WHO SUPPLIES THIS CATALOG IN TURN TO OTHER USERS MUST REFER TO THE ORIGINAL SOURCE, WHICH IS THE WEBSITE http://www.physics.mcmaster.ca/Globular.html AND MUST DO SO WITHOUT CHARGE OF ANY FEE.

Parameters

Name
The commonly used name of the globular cluster.

Alt_Name
An alternative commonly used name of the globular cluster.

RA
The Right Ascension of the cluster in the specified equinox. This was given in equinox 2000 and with a precision of 0.1 seconds of time in the originating table.

Dec
The Declination of the cluster in the specified equinox. This was given in equinox 2000 and with a precision of 1 arcsecond in the originating table.

LII
The Galactic Longitude of the cluster.

BII
The Galactic Latitude of the cluster.

Helio_Distance
The distance of the cluster from the Sun, in kiloparsecs (kpc).

Galcen_Distance
The distance of the cluster from the Galactic Center, in kiloparsecs (kpc), assuming that the distance of the Sun from the Galactic Center R_0 is 8.0 kpc.

X_Distance
The distance component X in a Sun-centered coordinate system, in kiloparsecs (kpc), where X points toward the Galactic center, Y points in the direction of the Galactic rotation, and Z points towards the North Galactic Pole.

Y_Distance
The distance component Y in a Sun-centered coordinate system, in kiloparsecs (kpc), where X points toward the Galactic center, Y points in the direction of the Galactic rotation, and Z points towards the North Galactic Pole.

Z_Distance
The distance component Z in a Sun-centered coordinate system, in kiloparsecs (kpc), where X points toward the Galactic center, Y points in the direction of the Galactic rotation, and Z points towards the North Galactic Pole.

Reddening
The foreground reddening, E(B-V), in magnitudes.

HB_Vmag
The V magnitude level of the cluster horizontal branch (or of the cluster's RR Lyrae variables).

App_Distance_Mod
The apparent visual distance modulus, (m-M)_V, in magnitudes.

Vmag
The integrated V magnitude of the cluster.

Abs_Vmag
The absolute visual magnitude (cluster luminosity).

UB_Color
The integrated U-B color index (uncorrected for reddening).

BV_Color
The integrated B-V color index (uncorrected for reddening).

VR_Color
The integrated V-R color index (uncorrected for reddening).

VI_Color
The integrated V-I color index (uncorrected for reddening).

RRLyr_Frequency
The specific frequency of RR Lyrae variables in the cluster, i.e., the number of RR Lyrae variables in the cluster, normalized to a total cluster luminosity M_Vt = -7.5.

HB_Ratio
The horizontal-branch ratio parameter, HBR = (B-R)/(B+V+R), where, in this case, B denotes the number of horizontal-branch stars on the blue side of the RR Lyrae region, V the number of stars in the RR Lyrae region, and R the number of stars on the red side of the RR Lyrae region.

HB_Morph_Type
The Dickens horizontal-branch morphological type on an integer scale from 1 to 7, where 1 denotes a cluster with a completely blue HB (all stars on the blue side of the RR Lyrae region) and 7 denotes a completely red HB. The author of this catalog has introduced, in addition, a new type of "0" to denote any cluster with an extremely blue extension of the HB. In a few cases, where the distribution of stars along the HB is bimodal, the cluster has been assigned two simultaneous HB types.

Metallicity
The cluster metallicity, [Fe/H], relative to the solar value.

Spect_Type
The cluster integrated spectral type.

Radial_Velocity
The heliocentric radial velocity of the cluster, in km/s.

Radial_Velocity_Error
The observational (internal) uncertainty in the radial velocity of the cluster, in km/s.

LSR_Radial_Velocity
The radial velocity of the cluster relative to the Solar Local Standard of Rest, in km/s.

Central_Concentration
The cluster central concentration, c = log(r_t/r_c), where r_t is the tidal radius of the cluster and r_c is the core radius of the cluster.

Core_Collapse_Flag
A flag that is set to 'C' to denote a core-collapsed cluster.

Core_Radius
The core radius r_c of the cluster, in arcminutes.

Halfmass_Radius
The half-mass radius of the cluster, in arcminutes.

Tidal_Radius
The tidal radius r_t of the cluster, in arcminutes.

Log_Core_Relaxtime
The logarithm (base 10) of the core relaxation time of the cluster, in years.

Log_HMR_Relaxtime
The logarithm (base 10) of the relaxation time at the half-mass radius of the cluster, in years.

Cent_Surf_Brightness
The central surface brightness of the cluster, in V magnitudes per square arcsecond.

Log_Lum_Density
The logarithm (base 10) of the central luminosity density of the cluster, in units of Solar luminosities per cubic parsec (L_sun/pc^3).

Class
The HEASARC Browse object classification: all objects in this catalog have been given the (same) class, globular cluster.

Ellipticity
The ellipticity or eccentricity of the cluster e = (1 - b/a), where a and b are the semimajor and semiminor axes of the cluster light profile, respectively. This parameter is a measure of the projected shape of the cluster.


Contact Person

Questions regarding the GLOBCLUST database table can be addressed to the HEASARC User Hotline.
If you have any problems, please consult the help page or mail ledas-help@star.le.ac.uk
 
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