Release 11.12 ("Hergest Ridge")
The meaning of the columns of the database is the same
that in the database of William E. Harris
(values mainly come from Harris 2003 and Harris 2010, details here)
Namely, the different colums give:
ID | Cluster identification number | NGC 104 |
Name | Other commonly used cluster name | 47 Tuc |
RA | Right ascension (J2000) (not shown on Table I) | 00 24 05.2 |
DEC | Declination (J2000) (not shown on Table I) | -72 04 51 |
l | Galactic longitude (degrees) | 305.90 |
b | Galactic latitude (degrees) | -44.89 |
R_Sun | Distance from Sun (kiloparsecs) | 4.5 |
R_gc | Distance from Galactic center (kpc), assuming R_0=8.0 kpc | 7.4 |
X | Distance components X in Sun-centered coordinate system; X points toward Galactic center | 1.9 |
Y | Distance components Y in Sun-centered coordinate system : Y points in direction of Galactic rotation | -2.6 |
Z | Distance components Z in Sun-centered coordinate system: Z toward North Galactic Pole | -3.2 |
ID | Cluster identification | NGC 104 |
E(B-V) | Foreground reddening | 0.04 |
V_HB | V magnitude level of the horizontal branch (or RR Lyraes) | 14.06 |
(m-M)V | Apparent visual distance modulus | 13.37 |
V_t | Integrated V magnitude of the cluster | 3.95 |
M_Vt | Absolute visual magnitude (cluster luminosity) | -9.42 |
U-B | Integrated color indices (U-B) (uncorrected for reddening) | 0.37 |
B-V | Integrated color indices (B-V) (uncorrected for reddening) | 0.88 |
V-R | Integrated color indices (V-R) (uncorrected for reddening) | 0.53 |
V-I | Integrated color indices (V-I) (uncorrected for reddening) | 1.14 |
S_RR | Specific frequency of RR Lyrae variables | 0.3 |
HBR | Horizontal-branch ratio, HBR = (B-R)/(B+V+R) | -0.99 |
hbt | Dickens horizontal-branch morphological type | 7 |
ID | Cluster identification | NGC 104 |
[Fe/H] | Metallicity [Fe/H] | -0.76 |
SpT | Integrated spectral type | G4 |
v_r | Heliocentric radial velocity (km/s) | -18.7 |
+/- | Observational (internal) uncertainty in radial velocity | 0.2 |
v_LSR | Radial velocity relative to Solar local standard of rest | -28.0 |
c | Central concentration, c = log(r_t/r_c) | 2.03 |
r_c | Core radius in arcmin | 0.44 |
r_h | Half-mass radius in arcmin | 2.79 |
r_t | Tidal radius in arcmin | 47.25 |
lg(tc) | Logarithm of core relaxation time, in log_10(years) | 8.06 |
lg(th | Logarithm of relaxation time at the half-mass radius, in log_10(years) | 9.48 |
mu_V | Central surface brightness, V magnitudes per square arcsecond | 14.43 |
rho_0 | Logarithm of central luminosity density (Solar luminosities per cubic parsec | 4.77 |
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