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J/AJ/120/3111       Stromgren photometry of NGC 6397     (Anthony-Twarog+, 2000)

CCD uvbyHβ photometry in clusters. II. The nearest globular cluster, NGC 6397. Anthony-Twarog B.J., Twarog B.A. <Astron. J., 120, 3111-3126 (2000)> =2000AJ....120.3111A
ADC_Keywords: Clusters, globular ; Photometry, uvby, beta Keywords: globular clusters: individual (NGC 6397) - techniques: photometric Abstract: CCD photometry extending below the turnoff of the globular cluster NGC 6397 on the uvbyHβ system is presented and analyzed. Restricting the sample to stars with small photometric errors and highly probable cluster membership, the reddening from approximately 1500 stars at the turnoff is E(b-y)=0.127±0.002 (standard error of the mean), equivalent to E(B-V)=0.179±0.003. The photometric abundance for the same sample, on the revised spectroscopic scale for globular clusters, is [Fe/H]=-1.82±0.04 (standard error of the mean). From 220 cluster red giants, well-defined relations are established for m1 and c1 as a function of b-y. Description: Photoelectric photometry on the uvbyCa system of a modest sample of brighter stars in NGC 6397 was obtained over a series of runs at Cerro Tololo Inter-American Observatory between 1990 and 1992. The data were collected within the context of a program to observe field halo giants using traditional photometers on the 1.0m and 1.5m telescopes; the data for NGC 6397 were obtained only with the 1.5m telescope. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 17 40 41.4 -53 40 25 NGC 6397 = GCl 74 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 60 15 Photoelectric photometry in NGC 6397 table2.dat 105 5137 CCD Photometry in NGC 6397 table3.dat 79 50 Normal sequences for NGC 6397
See also: J/AJ/119/2282 : Stromgren photometry of IC 4651 (Anthony-Twarog+, 2000) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 7 A7 --- Name Stellar identification (1) 9- 14 F6.3 mag Vmag ? V-band magnitude 16- 20 F5.3 mag e_Vmag ? uncertainty in Vmag 22- 26 F5.3 mag b-y ? b-y color index 28- 32 F5.3 mag e_b-y ? uncertainty in b-y 34 I1 --- Nyb ? Number of stars observed in y and b 36- 40 F5.3 mag m1 ? m1 metallicity-sensitive index magnitude 42- 46 F5.3 mag e_m1 ? uncertainty in m1 48- 52 F5.3 mag c1 ? c1 band magnitude 54- 58 F5.3 mag e_c1 ? uncertainty in c1 60 I1 --- Nvu ? Number of stars observed in u and v
Note (1): Reference for the stars: Alc = Alcaino 1977A&AS...29..397A, Cl* NGC 6397 ALC NNN ROB = Woolley et al. 1961RGOB...43..303W, NGC 6397 NNNN
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 7 A7 --- Name Stellar identification (1) 9- 14 F6.1 pix Xpos X position on the CCD 16- 21 F6.1 pix Ypos Y position on the CCD 23- 28 F6.3 mag Vmag V-band magnitude 31- 35 F5.3 mag b-y b-y color index 37- 42 F6.3 mag m1 m1 metallicity-sensitive index magnitude 44- 49 F6.3 mag c1 c1-band magnitude 51- 57 F7.3 mag beta Hβ-band magnitude 59- 63 F5.3 mag e_Vmag uncertainty in Vmag 65- 69 F5.3 mag e_b-y uncertainty in b-y 71- 75 F5.3 mag e_m1 uncertainty in m1mag 77- 81 F5.3 mag e_c1 uncertainty in C1mag 83- 87 F5.3 mag e_beta uncertainty in beta 89- 90 I2 --- Ny Number of stars observed in y 92- 93 I2 --- Nb Number of stars observed in b 95- 96 I2 --- Nv Number of stars observed in v 98- 99 I2 --- Nu Number of stars observed in u 101-102 I2 --- Nw Number of stars observed in β-wide 104-105 I2 --- Nn Number of stars observed in β-narrow
Note (1): Reference for the star names: Alc = Alcaino, 1977A&AS...29..397A, Cl* NGC 6397 ALC ROB = Woolley et al., 1961RGOB...43..303W, NGC 6397 NNNN A&L = Alcaino & Liller, 1980AJ.....85..680A, Cl* NGC 6397 AL R&B = Rubenstein & Bailyn, 1996AJ....111..260R V = Kaluzny, 1997A&AS..122....1K, Cl* NGC 6397 SAW VNN
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 6 A6 --- Type Stellar type (Giants, AGB or BHB) 8- 13 F6.3 mag Vmag V-band magnitude 15- 19 F5.3 mag e_Vmag ? uncertainty in Vmag 21- 25 F5.3 mag b-y b-y color index 27- 31 F5.3 mag e_b-y ? uncertainty in b-y 33- 37 F5.3 mag m1 m1 metallicity-sensitive index magnitude 39- 43 F5.3 mag e_m1 ? uncertainty in m1 45- 47 I3 --- Nybv ? Number of stars observed in y, b and v 49- 53 F5.3 mag c1 c1-band magnitude 55- 59 F5.3 mag e_c1 ? uncertainty in c1 61- 63 I3 --- Nu ? Number of stars observed in u 65- 69 F5.3 mag beta Hβ-band magnitude 71- 75 F5.3 mag e_beta ? uncertainty in beta 77- 79 I3 --- Nbeta ? Number of stars observed in β
History: From electronic version of the journal References: Anthony-Twarog & Twarog, Paper I 2000AJ....119.2282A, Cat. J/AJ/119/2282
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 27-May-2010
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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