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J/ApJS/120/265      HST photometry of M4                     (Ibata+, 1999)

Hubble Space Telescope photometry of the globular cluster M4. Ibata R.A., Richer H.B., Fahlman G.G., Bolte M., Bond H.E., Hesser J.E., Pryor C., Stetson P.B. <Astrophys. J. Suppl. Ser. 120, 265 (1999)> =1999ApJS..120..265I
ADC_Keywords: Clusters, globular ; Photometry, UBVRI Mission_Name: HST Keywords: globular clusters: individual (M4) - Hertzsprung-Russell diagram - white dwarfs Abstract: This paper presents a detailed description of the acquisition and processing of a large body of imaging data for three fields in the globular cluster M4 taken with the Wide Field and Planetary Camera 2 aboard the Hubble Space Telescope. Analysis with the ALLFRAME package yielded the deepest photometry yet obtained for this cluster. The resulting data set for 4708 stars (positions and calibrated photometry in V, I, and, in two fields, U) spanning approximately six cluster core radii is presented. The scientific analysis is deferred to three companion papers, which investigate the significant white dwarf population discovered and the main-sequence population. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table5.dat 126 4708 The photometry
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 4 I4 --- IRF Identification number (Cl* NGC 61621 IRF NNNN) 6 A1 --- Field [016] Field number (1) 8 I1 --- Chip [1/4] Chip number (2) 10 I1 --- Class [0] Visual classification (3) 12- 17 F6.2 pix xpos x position (4) 19- 24 F6.2 pix ypos y position (4) 26- 34 F9.5 deg RAdeg Right ascension (J2000) 36- 44 F9.5 deg DEdeg Declination (J2000) 46- 52 F7.3 mag F336W ?=999.990 F336W magnitude 54- 60 F7.3 mag Umag ?=999.990 U magnitude 62- 67 F6.3 mag e_Umag ?=99.990 rms uncertainty on Umag 69- 74 F6.3 --- 2_Umag ?=99.990 χ-value associated to Umag 76- 81 F6.3 mag F555W F555W magnitude 83- 88 F6.3 mag Vmag Johnson V magnitude 90- 94 F5.3 mag e_Vmag rms uncertainty on Vmag 96-100 F5.3 --- 2_Vmag χ-value associated to Vmag 102-107 F6.3 mag F814W F814W magnitude 109-114 F6.3 mag Imag Kron-Cousins I magnitude 116-120 F5.3 mag e_Imag rms uncertainty on Imag 122-126 F5.3 --- 2_Imag χ-value associated to Imag
Note (1): the fields are: 0: first field centered at 16h 23min 20s, -26° 31' 30" (J2000), approximately at the center of M4; 1: second field centered at 16h 23min 42s, -26° 30' 48" (J2000), about one core radius (=50.1") 6: third field centered at 16h 23min 56s, -26° 32' 27" (J2000), approximately six core radii from the center. Note (2): 1: PC chip; 2: WF1 chip; 3: WF2 chip; 4: WF3 chip Note (3): 0: the object is "clearly a star" 1: undecided Note (4): Pixel position of the object in the coordinate system of the first-observed F814W frame in that field
History: From ApJS electronic version References: Richer et al., Paper I 1995ApJ...451L..17R Richer et al., Paper II 1997ApJ...484..741R Fahlman et al., Paper III 1999, ApJ, submitted
(End) James Marcout, Patricia Bauer [CDS] 27-May-1999
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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