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J/AJ/107/230         BVRI CCD photometry of NGC 1904            (Alcaino+, 1994)

BVRI CCD photometry of the globular cluster NGC 1904 (M79) ALCAINO G., LILLER W., ALVARADO F., WENDEROTH E. <Astron. J. 107, 230 (1994)> =1994AJ....107..230A (SIMBAD/NED Reference)
ADC_Keywords: Clusters, globular; Photometry, CCD; Positional data Abstract: We present BVRI photometry of three overlapping fields in the globular cluster NGC 1904 (M79), observed with a CCD camera and the 2.2m Max-Planck-Institute telescope at ESO/La Silla. We critically compare our photometry using the INVENTORY data reduction code with results derived by other investigators using different codes. These comparisons convince us that all modern codes give results reliable to at least ±0.3mag at all levels, as long as the fields are not overly crowded. Specifically, our results for NGC 1904 (M79) are as follows: V(TO)=19.60±0.10 (estimated external error), with turnoff colors at B-V=0.40, V-R=0.27, V-I=0.57, and B-I=0.97, all with estimated external errors of ±0.06. By fitting the four resulting ridge lines to the theoretical isochrones of VandenBerg & Bell [ApJS, 58, 561 (1985)] interpolated to [Fe/H]=-1.60, Y=0.20, and [O/Fe]=0.00, we derive an average value for the age of 16Gyr, where we have adopted E(B-V)=0.01. Addresses: Instituto Isaac Newton, Ministerio de Educacion de Chile, Casilla 8-9, Correo 9, Santiago, Chile File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table6.dat 69 750 CCD coordinates, magnitudes, and colors for 750 stars in NGC 1904
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
2- 4 I3 --- Star Star number 5- 6 A2 --- n_Star Additional note for Star (1) 8- 12 F5.1 pix X X CCD coordinate 16- 20 F5.1 pix Y Y CCD coordinate 24- 29 F6.3 mag Vmag V magnitude 33- 37 F5.3 mag B-V []? B-V color 41- 45 F5.3 mag V-R []? V-R color 49- 53 F5.3 mag R-I []? R-I color 57- 61 F5.3 mag V-I []? V-I color 65- 69 F5.3 mag B-I []? B-I color
Note (1): Two variables reported by Sawyer-Hogg (1973, Pub. David Dunlop Obs. (University of Toronto Press, Toronto), Vol. 3, No. 6) lie in the observed area, and are marked "V2" (Star 437) and "V4" (Star 470). Also, the 6 standard stars are labelled "B" (Star 311), "C" (Star 714), "D" (Star 385), "E" (Star 303), "F" (Star 289), and "G" (Star 405). Table 4 of the printed paper details the observations of the standards.
Origin: AAS CD-ROM series, Volume 2, 1994
(End) Lee Brotzman [ADS] 21-May-1994, Patricia Bauer [CDS] 19-Oct-1994
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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