VII/13 Globular-Cluster Catalog (Arp 1965)
Globular-Cluster Catalog Arp H.C. <Stars and Stellar Systems, Vol. 5, gen. ed. G.P. Kuiper, eds. A. Blaauw and M. Schmidt, Chapter 19, p. 410. (1965)>
ADC_Keywords: Clusters, globular - 220 Description: This catalog is the Globular Cluster Catalog published by Halton C. Arp in 1965 as part of a review paper on globular Clusters. The review focused on the slightly more than a hundred roughly spherical star clusters that have integrated color indices between B-V = 0.6 an 0.8 mag and intrinsic magnitudes between Mbol = -4 and -10 mag. They are distributed about the center of the galaxy. Such clusters contain stars that are very old and metal poor. The catalog improves upon the earlier publication by Mrs. Hogg (1959). An estimate of the completeness of the catalog is 98 percent complete for galactic latitudes above b(II)=8 degrees and 94 percent complete for low latitudes for concentration classes less than XI. This catalog lists for all 119 clusters: the NGC number, or other ID, the name, the position in equatorial and galactic coordinates, the concentration class, galactic absorption, diameter at 0.9, magnitude of 25-st brightest star, distance modulus, galactic radius, x, y, and z positions, total brightness, apparent and intrinsic colors, spectral type and radial velocity. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file catalog.dat 135 119 *Catalog Data
Note on catalog.dat: NGC 2158 was dropped from Mrs. Hogg's list, because although Arp and McCuffey (1962) have shown this to be a transitional cluster in many respects, it is nevertheless similar in stellar content to NCG 7789 and NGC 752, which have been traditionally classified as galactic clusters. Also dropped was the so-called ''Russian cluster'' because under high resolution it proves to be a cluster of galaxies. Added was a faint, sparse globular cluster at 19h30m and -30d, a plate of which was found in Baade's files, and a globular cluster at low latitudes, NGC 6749, pictured in Setteducati and Weaver (1962), as well as a faint, distant cluster discovered by Arp and van den Bergh (1960).
See also: VII/151 : Parameters of Galactic Globular Clusters (Webbink 1985) Byte-by-byte Description of file: catalog.dat
Bytes Format Units Label Explanations
1- 6 A6 --- ID *NGC number or other 7 A1 --- n_ID *[ 5] note 9- 18 A10 --- name cluster name 20- 21 I2 --- Con_Cl *?Concentration Class 22 A1 --- uConCl uncertainty indicator Concentration Class 25- 26 I2 h RAh Right Ascension hours (1950.0) 28- 31 F4.1 min RAm Right Ascension minutes (1950.0) 32 A1 --- DE- Declination sign (1950) 33- 34 I2 deg DEd Declination degrees (1950) 36- 37 I2 arcmin DEm Declination arc minutes (1950) 39- 41 I3 deg GLON Galactic Longitude l II 42 A1 --- n_GLON note to GLON 45- 47 I3 deg GLAT Galactic Lattitude b II 48- 52 F5.2 --- ABS_LAW Galactic Absorption from formula 0.24 csc b 54- 57 F4.2 mag A(B) ? Kron-Mayal case II absorption law 58- 61 F4.1 arcsec D(0.9) ?Diameter (containing 0.9 of the light) 62 A1 --- u_D(0.9) uncertainty indicator Diameter 64- 68 F5.2 mag Bmean *?Mean B mag of 25 brightest stars 70- 74 F5.2 --- Dmod ?distance modulus (m-M)app from Bmean 76 A1 --- n_Dmod *note to Dmod 78- 82 F5.1 kpc r ?galactic radius from Dmod and ABS_LAW, Fig.7 85- 89 F5.1 kpc x *?Sun centered galactic X-coordinate 92- 96 F5.1 kpc y *?galactic y-coordinate in direction rotation 99-103 F5.1 kpc z *?height above galactic plane 106-110 F5.2 mag Btot *?apparent integrated B brightness 112-115 F4.2 mag B-V ?apparent color from Kron and Mayal (1960) 117-120 F4.1 mag M(B) *?absolute magnitudes from Btot 122-125 F4.2 mag (B-V)o ?intrinsic color using E(B-V) = 0.06 csc b 127-128 A2 --- Sp spectral type from Kron and Mayal (1960) 130 A1 --- n_Sp *[ :346]note on Spectral type 132-135 I4 km/s RV ?cluster radial velocity
Note on ID: 102 globular clusters have NGC designations 2 are listed in the Index catalogues Note on Con_Cl: The roman numerals have been replaced by arabic numerals. Note on Bmean: The apparent B magnitudes of the mean of the 25 brightest stars. Older photographic magnitudes have all been corrected using the photometric recalibration of the Selected Areas and the color index correction to the B system by Arp. Bmean can be used to estimate the distance of the cluster based on a mean intrinsic magnitude M(B) = -0.8 mag. This is used to derive the Dmod value. Note on n_ID, nSp,nDmod: Unmarked entries of Spectral Type are from Kron and Mayal (1960) : uncertain value 1 from V(hor br), table 6 in reference 2 adjusted to RR Lyrae distance scale via figure 7 in reference 3 Spectral type from Kinman (1959b). 4 Kinman (1959b) gives F2 5 Arp-Van den Bergh 6 Kinman (1959b) gives F3 Note on Btot, M(B): Apparent magnitudes measured by Kron and Mayal (1960) were transformed into the Johnson V system, transformed color indices were applied to derive Btot. Absolute magnitudes M(B) were found for the clusters that have distances using the CSC reddening law. Earlier measures of integrated globular cluster magnitudes by Christie (Hogg 1959) can be compared to the Kron-Mayal measures. Transforming both measures to the B system, it can be shown that they correlate well. The data for 12 additional clusters based on the Christie measures were included. Note on x,y,z: The coordinate system x,y, and z is centered on the Sun, with x directed toward the galaxy center, y in the direction of the rotation, and z perpendicular to the plane. In order to get a coordinate system with its center at the center of the galaxy it is only necessary to substract Ro, the distance between the Sun and the center of the galaxy, from x.
Other parameters: Cluster mass. Only for 2 clusters the mass was determined based on the internal kinematics. These are M92 (110,000 Msun) and 47 Tuc (2.5 to 6 million Msun). Remarks and Modifications: Arp's Globular Cluster Catalogue has been made machine-readable by Dr. N.P.M. Kuin at the ADC since catalog was requested frequently and the original version submitted by Dr. G. Share only contained ID and positions. References: H.C. Arp, in Galactic Structure, ed. A. Blaauw and M. Schmidt, 1965, University of Chicago Press, p. 401. Arp, H.C. and Van den Bergh S. 1960 PASP 72, 48 Arp, H.C. and McCuffey, J. 1962 ApJ 136, 51 (1962ApJ...136...51A) Hogg, Helen Sawyer 1959 Hdb. d. Phys., ed. S. Fluegge (Berlin: Springer Verlag) 53, 129 Kinman T.D. 1959b MNRAS 119, 538 (1959MNRAS.119..538K) Kron G.E. and Mayal N.U. 1960 AJ 65, 581 (1960AJ.....65..581K) Setteducati, A.F. and Weaver, H.F. 1962 Newly Found Star Clusters, Vol. 1 (Berkeley, University of California, Radio Astronomy Laboratory)
(End) N.P.M. Kuin 24-Apr-1996
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