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J/AJ/131/1184    A recalibration of optical photometry   (Maiz-Apellaniz+, 2006)
A recalibration of optical photometry: Tycho-2, Stromgren, and Johnson systems.
    Maiz-Apellaniz J.
   <Astron. J., 131, 1184-1199 (2006)>
   =2006AJ....131.1184M
ADC_Keywords: Photometry, sensitivity functions ; Photometry, UBV ;
              Photometry, uvby
Keywords: space vehicles: instruments - stars: fundamental parameters -
          techniques: photometric - techniques: spectroscopic

Abstract:
    I use high-quality Hubble Space Telescope (HST) spectrophotometry to
    analyze the calibration of three popular optical photometry systems:
    Tycho-2 BT and VT, Stromgren uvby, and Johnson UBV.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        21       42   Recommended photon-counting sensitivity curves
                              for the Tycho BTVT system
table2.dat        43       29   Recommended photon-counting sensitivity curves
                              for the Stromgren uvby standard system
table3.dat        32       47   Recommended photon-counting sensitivity curves
                              for the Johnson UBV standard system


Byte-by-byte Description of file: table1.dat

   Bytes Format Units   Label     Explanations

   1-  4  I4    0.1nm   BTlambda  ? Tycho BT filter wavelength in Angstroms
   6- 10  F5.3  ---     BTph      ? Tycho BT filter sensitivity
  12- 15  I4    0.1nm   VTlambda  Tycho VT filter wavelength in Angstroms
  17- 21  F5.3  ---     VTph      Tycho VT filter sensitivity


Byte-by-byte Description of file: table2.dat

   Bytes Format Units   Label     Explanations

   1-  4  I4    0.1nm   ulambda   ? Stromgren u filter wavelength in Angstroms
   6- 10  F5.3  ---     uph       ? Stromgren u filter sensitivity
  12- 15  I4    0.1nm   vlambda   Stromgren v filter wavelength in Angstroms
  17- 21  F5.3  ---     vph       Stromgren v filter sensitivity
  23- 26  I4    0.1nm   blambda   Stromgren b filter wavelength in Angstroms
  28- 32  F5.3  ---     bph       Stromgren b filter sensitivity
  34- 37  I4    0.1nm   ylambda   Stromgren y filter wavelength in Angstroms
  39- 43  F5.3  ---     yph       Stromgren y filter sensitivity


Byte-by-byte Description of file: table3.dat

   Bytes Format Units   Label     Explanations

   1-  4  I4    0.1nm   Ulambda   ? Johnson U filter wavelength in Angstroms
   6- 10  F5.3  ---     Uph       ? Johnson U filter sensitivity
  12- 15  I4    0.1nm   Blambda   ? Johnson B filter wavelength in Angstroms
  17- 21  F5.3  ---     Bph       ? Johnson B filter sensitivity
  23- 26  I4    0.1nm   Vlambda   Johnson V filter wavelength in Angstroms
  28- 32  F5.3  ---     Vph       Johnson V filter sensitivity


History:
    From electronic version of the journal

References:
  Maiz-Apellaniz J., Paper I     2005PASP..117..615M
(End)                   Greg Schwarz [AAS], Marianne Brouty [CDS]    09-Jan-2007