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II/202              Long-term photometry of Variables IV     (Sterken+, 1995)
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Long-Term Photometry of Variables at ESO. IV.
The Fourth Data Catalogue (1992-1994)
     Sterken C., Manfroid J., Beele D., de Koff S., Eggenkamp I.M.M.G.,
     Goecking K., Jorissen A., Kaufer A., Kuss C., Schoenmakers A.P.,
     Still J.M., van Loon J., Vink J., Vrielmann S., Waelde E.
    <ESO Scientific Report 16 (1996)>
    <Astron. Astrophys. Suppl. Ser. 113, 31 (1995)>
    =1995A&AS..113...31S
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ADC_Keywords: Photometry, uvby ; Stars, variable

Description:
    This is the fourth catalogue of photometric data in the Stroemgren
    system obtained during the period June 18, 1992 - August 23, 1994
    in the framework of the Long-Term Photometry of Variables (LTPV)
    program at the European Southern Observatory.
    Since our goal is not absolute (all-sky) photometry, the observations
    should be used for differential photometry only.
    The mean values of the r.m.s. deviations of the differential
    measurements of comparison stars are around (from Table 3 of paper)
                ------------------------------
                   y     b-y      m1      c1
                ------------------------------
                0.005   0.002   0.004   0.007
                ------------------------------

Important Notice:
    The file "ltpv4.dat" which was accessible at CDS before 20 October 1996
    was incorrect.

File Summary:
--------------------------------------------------------------------------------
 FileName   Lrecl    Records    Explanations
--------------------------------------------------------------------------------
ReadMe         80          .    This file
ltpv4.dat      64      14102   *The observations
stars4.dat     77        324    The list of stars observed
--------------------------------------------------------------------------------
Note on ltpv4.dat: this file has been corrected in October 1996 at CDS
     (see the Important Notice above)
--------------------------------------------------------------------------------

See also:
    II/170 : Long-Term Photometry of Variables at ESO I   (1991)
    II/188 : Long-Term Photometry of Variables at ESO II  (1993)
    II/200 : Long-Term Photometry of Variables at ESO III (1995)

Byte-by-byte Description of file: ltpv4.dat
--------------------------------------------------------------------------------
   Bytes Format  Units   Label    Explanations
--------------------------------------------------------------------------------
   1-  5  A5     ---     Name     Star Identification (1)
  10- 20  F11.3  d       HJD      [2448791/2449596] Heliocentric Julian Date
  22- 26  F5.3   ---     Airmass  Airmass quantity (sec.z)
  28- 33  F6.3   mag     ymag     Stroemgren's y magnitude
  37- 42  F6.3   mag     b-y      Stroemgren's b-y colour
  46- 51  F6.3   mag     m1       Stroemgren's m1 ((v-b)-(b-y)) colour
  55- 60  F6.3   mag     c1       Stroemgren's c1 ((u-v)-(v-b)) colour
      64  A1     ---     T/S      [N] Telescope/system  code ("N" is the
                                      "natural" system")
--------------------------------------------------------------------------------
Note (1): The cross-identifications are explained in "stars4.dat" file.
    Program stars start with the letter P, and comparison stars
    with A, B ...
--------------------------------------------------------------------------------

Byte-by-byte Description of file: stars4.dat
--------------------------------------------------------------------------------
   Bytes Format  Units   Label    Explanations
--------------------------------------------------------------------------------
   1-  5  A5     ---     Name     Star Identification, as in file "ltpv4.dat".
   7- 14  A8     ---     HD       HD designation
  16- 21  A6     ---     HR       HR (Bright Star) designation
  23- 34  A12    ---     DM       Durchmusterung (BD, CoD, CPD) designations
  36- 45  A10    ---     Name2    Other designation
  47- 48  I2     h       RAh      Right Ascension J2000 (hours)
  50- 51  I2     min     RAm      Right Ascension J2000 (minutes)
  53- 54  I2     s       RAs      Right Ascension J2000 (seconds)
      56  A1     ---     DE-      Declination J2000 (sign)
  57- 58  I2     deg     DEd      Declination J2000 (degrees)
  60- 61  I2     arcmin  DEm      Declination J2000 (minutes)
  63- 64  I2     arcsec  DEs      Declination J2000 (seconds)
  66- 77  A12    ---     Sp       Spectral classification
--------------------------------------------------------------------------------

History of the Catalogue:
  * The original LaTeX files were provided by Chris Sterken in LaTeX
    format in November 1995; an unfortunate error in the translation
    from latex to ascii made at CDS generated an erroneous "ltpv4"
    file, which was only detected in October 1996 thanks to
    Ali Moujtahid <moujtahi@mesioq.obspm.fr>
  * 21-Oct-1996: file "ltpv4.dat" recreated at CDS.

Acknowledgements:
    We thank Chris Sterken <csterken@vub.ac.be> for providing the
    original catalogue in LaTeX format.
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(End)                                    Francois Ochsenbein [CDS]   21-Oct-1996