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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 126 4708 The photometry
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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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
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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
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History: From ApJS electronic version
References:
Richer et al., Paper I 1995ApJ...451L..17R 1995ApJ...451L..17R
Richer et al., Paper II 1997ApJ...484..741R 1997ApJ...484..741R
Fahlman et al., Paper III 1999, ApJ, submitted
(End) James Marcout, Patricia Bauer [CDS] 27-May-1999