ADC/CDS Standard Document for Catalog:
/journal_tables/A+AS/146/169/

1. Use the ADC Data Viewer Suite to visualize the data.
2. Get the data files via anonymous FTP. (See Note.)

J/A+AS/146/169      Secondary UBVRI-CCD standard stars      (Galadi+, 2000)
================================================================================
Secondary UBVRI-CCD standard stars in the neighbourhood of
Landolt standard stars
     Galadi-Enriquez D., Trullols E., Jordi C.
      <Astron. Astrophys. Suppl. Ser. 146, 169 (2000)>
      =2000A&AS..146..169G      (SIMBAD/NED BibCode)
================================================================================
ADC_Keywords: Photometry, UBVRI
Keywords: methods: observational - techniques: photometric - stars: general

Description:
    Table 4 contains astrometric (alpha, delta) and photometric (UBVRI)
    data for 681 secondary standard stars in the neighbourhood of several
    Landolt standard stars. Several columns contain information related to
    the origin and quality of the photometry. Cross-identifications with
    USNO-A2.0 catalogue (<I/252>) are given. Further cross-identifications
    are given in notes.

File Summary:
--------------------------------------------------------------------------------
  FileName   Lrecl  Records   Explanations
--------------------------------------------------------------------------------
ReadMe          80        .   This file
table4.dat     124      681   UBVRI-CCD secondary standard stars
notes.dat       56       21   Notes to Table 4
--------------------------------------------------------------------------------

See also:
    I/252  : The USNO-A2.0 Catalogue (Monet+ 1998)
    II/183 : UBVRI Photometric Standards (Landolt, 1992)

Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
   Bytes Format Units   Label    Explanations
--------------------------------------------------------------------------------
   2-  3  I2    ---     Field    Field number
   5-  7  I3    ---     Star     Star number inside its field
   9- 10  I2    h       RAh      Right ascension (J2000)
  12- 13  I2    min     RAm      Right ascension (J2000)
  15- 19  F5.2  s       RAs      Right ascension (J2000)
      23  A1    ---     DE-      Declination sign (J2000)
  24- 25  I2    deg     DEd      Declination (J2000)
  27- 28  I2    arcmin  DEm      Declination (J2000)
  30- 33  F4.1  arcsec  DEs      Declination (J2000)
  36- 41  F6.3  mag     Vmag     Magnitude in V band
  43- 47  F5.3  mag   e_Vmag     Error of V magnitude
  49- 54  F6.3  mag     B-V      ?=99.999 Colour index B-V
  56- 60  F5.3  mag   e_B-V      ?=9.999 Error of B-V colour index
  62- 67  F6.3  mag     U-B      ?=99.999 Colour index U-B
  69- 73  F5.3  mag   e_U-B      ?=9.999 Error of U-B colour index
  75- 80  F6.3  mag     V-R      Colour index V-R
  82- 86  F5.3  mag   e_V-R      Error of V-R colour index
  88- 93  F6.3  mag     V-I      Colour index V-I
  95- 99  F5.3  mag   e_V-I      Error of V-R colour index
 101-102  I2    ---   o_Star     Observational runs with useful data
 104-105  I2    ---   o_Vmag     Number of useful measurements in V
     107  A1    ---     ---      [U] for USNO-A2.0 
 108-120  A13   ---   USNO-A2.0  ? Cross-identification with USNO-A2.0 (<I/252>)
 122-124  A3    ---     Notes    ? Callings to table notes.dat
--------------------------------------------------------------------------------

Byte-by-byte Description of file: notes.dat
--------------------------------------------------------------------------------
   Bytes Format Units   Label     Explanations
--------------------------------------------------------------------------------
   2-  2  A1    ---     Calling   [ *a-t] Calling from Table 4
   4-  6  I3    ---     Field    *?=0 Field number
   8- 10  I3    ---     Star     *?=0 Star number inside its field
  13- 56  A44   ---     Text     *Cross-identifications and comments
--------------------------------------------------------------------------------
Note on Field, Star: The null value (0) indicates that this comment holds
     not for just one star, but for any star labelled with the same calling
Note on Text: the cross-identification refer to
     AC  = AC2000 (Cat. <I/247>)
     HIP and TYC = Hipparcos & Tycho Catalogues (Cat. <I/239>)
--------------------------------------------------------------------------------

Acknowledgements: David Galadi <dgaladi@am.ub.es>
================================================================================
(End)          David Galadi-Enriquez [Centro de Astrobiologia]       18-Jul-2000