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J/AJ/132/1221   VJHK and SDSS photometry of DA white dwarfs (Holberg+, 2006)

Calibration of synthetic photometry using DA white dwarfs. Holberg J.B., Bergeron P. <Astron. J., 132, 1221-1233 (2006)> =2006AJ....132.1221H
ADC_Keywords: Stars, white dwarf ; Photometry, SDSS ; Photometry, infrared Keywords: standards - stars: fundamental parameters - stars: individual (Vega) - techniques: photometric - white dwarfs Abstract: We have calibrated four major ground-based photometric systems with respect to the Hubble Space Telescope (HST) absolute flux scale, which is defined by Vega and four fundamental DA white dwarfs. These photometric systems include the Johnson-Kron-Cousins UBVRI, the Stroemgren uvby filters, the Two Micron All Sky Survey JHKs, and the Sloan Digital Sky Survey ugriz filters. Synthetic magnitudes are calculated from model white dwarf spectra folded through the published filter response functions; these magnitudes in turn are absolutely calibrated with respect to the HST flux scale. Effective zero-magnitude fluxes and zero-point offsets of each system are determined. In order to verify the external observational consistency, as well as to demonstrate the applicability of these definitions, the synthetic magnitudes are compared with the respective observed magnitudes of larger sets of DA white dwarfs that have well-determined effective temperatures and surface gravities and span a wide range in both of these parameters. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table13.dat 53 188 Observed 2MASS Magnitudes and Model Input Parameters table14.dat 60 175 Observed SDSS Magnitudes and Model Input Parameters
See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) : SDSS Home Page Byte-by-byte Description of file: table13.dat
Bytes Format Units Label Explanations
1- 12 A12 --- WD White dwarf identification 14- 18 I5 K Teff Effective temperature 20- 23 F4.2 [cm/s2] log(g) Log of the surface gravity 25- 30 F6.3 mag Vmag The V band magnitude 32- 37 F6.3 mag Jmag 2MASS J band magnitude 39- 44 F6.3 mag Hmag ? 2MASS H band magnitude 46- 51 F6.3 mag Kmag ? 2MASS K band magnitude 53 A1 --- Note [*] Correction of WD0134+883 into WD0134+833
Byte-by-byte Description of file: table14.dat
Bytes Format Units Label Explanations
1- 12 A12 --- WD White dwarf identification 14- 19 I6 K Teff Effective temperature 21- 25 F5.3 [cm/s2] log(g) Log of the surface gravity 27- 32 F6.3 mag umag SDSS u band magnitude 34- 39 F6.3 mag gmag SDSS g band magnitude 41- 46 F6.3 mag rmag SDSS r band magnitude 48- 53 F6.3 mag imag SDSS i band magnitude 55- 60 F6.3 mag zmag SDSS z band magnitude
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 25-Apr-2008
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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