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J/PASP/117/37    BVRI photometry in NGC 2419, Pal 4, and Pal 14    (Saha+, 2005)

Faint BVRI photometric sequences in selected fields. Saha A., Dolphin A.E., Thim F., Whitmore B. <Publ. Astron. Soc. Pac., 117, 37-78 (2005)> =2005PASP..117...37S
ADC_Keywords: Photometry, UBVRI ; Clusters, globular ; Photometry, Cousins Abstract: The results from work done to extend the Johnson-Cousins BVRI photometric standard sequence to faint levels of V∼21mag in compact fields is presented. Such calibration and extension of sequences is necessary to fill a calibration gap if reliable photometry from modest aperture telescopes in space (e.g., the Hubble Space Telescope) or terrestrial telescopes with apertures exceeding 4m is to be done. Sequences like the ones presented here, which cover a large range in brightness as well as color, will allow photometric calibration to be done efficiently and will also make such work less prone to systematic sources of error. Photometry of stars in approximately 10'x10' fields around three globular clusters (NGC 2419, Pal 4, and Pal 14) are presented from data acquired over several photometric nights. In each field, several stars are measured in B, V, R, and I passbands, with standard errors in the mean less than 0.015mag from random errors, to levels fainter than V=21mag. Description: Observations were made primarily with the WIYN 3.5m telescope at the Kitt Peak National Observatory. In addition, our target fields and standard stars were also observed at the WIYN 0.9m telescope at Kitt Peak. Observations of NGC 2419, Pal 4, and Pal 14, all of which are distant globular clusters in our galaxy and have the additional virtue of having been observed repeatedly with the WFPC2 camera of the HST, were made on nights that appeared to be cloudless. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 07 38 08.5 +38 52 55 NGC 2419 = C 0734+390 11 29 16.8 +28 58 25 Pal 4 = UGCA 237 16 10 59.0 +14 57 42 Pal 14 = GCl 38 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table4.dat 145 3989 Stars in the NGC 2419 field with at least V and I photometry table7.dat 145 624 Stars in the Pal 4 field with at least V and I photometry table10.dat 145 1651 Stars in the Pal 14 field with at least V and I photometry
See also: J/AJ/117/247 : Ages for globular clusters in the halo (Stetson+, 1999) Byte-by-byte Description of file: table4.dat table7.dat table10.dat
Bytes Format Units Label Explanations
1- 8 F8.3 pix Xpos X position 10- 17 F8.3 pix Ypos Y position 19- 20 I2 h RAh Hour of Right Ascension (J2000.0) (1) 22- 23 I2 min RAm Minute of Right Ascension (J2000.0) (1) 25- 29 F5.2 s RAs Second of Right Ascension (J2000.0) (1) 30 A1 --- DE- Sign of the Declination (J2000.0) (1) 31- 32 I2 deg DEd Degree of Declination (J2000.0) (1) 34- 35 I2 arcmin DEm Arcminute of Declination (J2000.0) (1) 37- 40 F4.1 arcsec DEs Arcsecond of Declination (J2000.0) (1) 42- 47 F6.3 mag Vmag Mean V magnitude 49- 53 F5.3 mag e_Vmag Error in Vmag 55- 56 I2 --- o_Vmag Number of observations of Vmag 58- 65 F8.2 --- VChi2 ? Reduced χ^2 (I band) 67- 72 F6.3 mag Imag Mean I magnitude 74- 78 F5.3 mag e_Imag Error in Imag 80- 81 I2 --- o_Imag Number of observations of Imag 83- 89 F7.2 --- IChi2 ? Reduced χ^2 (I band) 91- 96 F6.3 mag Rmag ? Mean R magnitude 98-102 F5.3 mag e_Rmag ? Error in Rmag 104-105 I2 --- o_Rmag ? Number of observations of Rmag 107-114 F8.2 --- RChi2 ? Reduced χ^2 (R band) 116-122 F7.3 mag Bmag ? Mean B magnitude 124-129 F6.3 mag e_Bmag ? Error in Bmag 131-132 I2 --- o_Bmag ? Number of observations of Bmag 134-141 F8.2 --- BChi2 ? Reduced χ^2 (B band) 143-145 A3 --- SDT SDT identification number (2)
Note (1): Designations in Simbad: [SDT2005] NGC 2419 in table4.dat [SDT2005] Pal 4 in table7.dat [SDT2005] Pal 14 in table10.dat Note (2): NNN for star with best photometry, VNN for likely variable star. Designations in Simbad: Cl* NGC 2419 SDT NNN in table4.dat Cl* NGC 2419 SDT VNN in table4.dat Cl* Palomar 4 SDT NN in table7.dat Cl* Palomar 4 SDT VN in table7.dat Cl* Palomar 14 SDT NNN in table10.dat Cl* Palomar 14 SDT VN in table10.dat
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 03-Feb-2006
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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