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J/A+AS/114/337      CCD photometric observations of blazars      (Guibin+, 1995)
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CCD photometric observations of blazars
    Guibin J., Huiyu M., Xuefen C., Zhili L., Shengquan L., Guanghua L.
   <Astron. Astrophys. Suppl. Ser. 114, 337 (1995)>
   =1995A&AS..114..337G      (SIMBAD/NED BibCode)
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ADC_Keywords: BL Lac objects ; QSOs
Keywords: BL Lacertae objects - quasars

Description:
    The results of both BVRI CCD photometric monitoring and fast
    photometry in a certain optical waveband for 4 blazar objects and
    variable quasar are presented. The results show that 1) 3C 120 has a
    short time scale variability about 20 minutes, with the different
    shape of light curve and with different amplitude (one is
    0.21+/-0.06mag, the other is 0.053+/-0.014mag) in different night. One
    day timescale variability was also observed, with a maximum decrease
    of the flux near 20%. 2) OJ 287 has a variability on a timescale of
    one day, with the maximum amplitude of changes about 0.2mag. Since
    1990, the source brightened near 0.8mag. 3) 3C 345 is fainter during
    observing periods, the faintest magnitude B~17.5 mag it seems variable
    from night to night. 4) The variability with a small amplitude about
    0.1mag appear on a timescale of about 10 months in the data of PHL
    658. The values of the colour index of the blazars in each night are
    given.

Objects:
    ------------------------------
       RA  (2000)   DE    Name    
    ------------------------------
    08 54 48.9 +20 06 31  OJ 287   
    04 33 11.1 +05 21 15  3C 120   
    16 42 58.8 +39 48 37  3C 345   
    00 05 59.1 +16 09 48  PHL 658  
    ------------------------------

File Summary:
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  FileName      Lrecl  Records   Explanations
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ReadMe             80        .   This file
table1             41      519   Observed results for blazars
table2             92       28   Average colour indices and average
                                 magnitudes of blazars
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Byte-by-byte Description of file: table1
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   Bytes Format  Units   Label    Explanations
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   2-  8  A7     ---       Name     Object name
   9- 16  A8    "MM/DD/YY" Date     Date of observation
  18- 28  F11.3  d         JD       Julian day
  30- 34  F5.2   mag       Mag      Magnitude
  36- 39  F4.2   mag     e_Mag      Error on the magnitude
      41  A1     ---       Band     [BVRI] Observed waveband
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Byte-by-byte Description of file: table2
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   Bytes Format  Units   Label    Explanations
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   1-  6  A6     ---       Name    Object name
   8- 15  A8    "MM/DD/YY" Date    Date of observation
  17- 20  F4.2   mag       <B-V>   []? <B-V> average of colour indices
  22- 25  F4.2   mag     e_<B-V>   []? Error on <B-V>
  27- 30  F4.2   mag       <V-R>   []? <V-R> average of colour indices
  32- 35  F4.2   mag     e_<V-R>   []? Error on <V-R>
  37- 40  F4.2   mag       <R-I>   []? <R-I> average of colour indices
  42- 45  F4.2   mag     e_<R-I>   []? Error on <R-I>
      48  I1     ---       Ncol    []? Number of observed colour indices
  50- 54  F5.2   mag       <Bmag>  []? Average of B magnitude <B>
  56- 59  F4.2   mag     e_<Bmag>  []? Error on <B>
  61- 65  F5.2   mag       <Vmag>  []? Average of V magnitude <V>
  67- 70  F4.2   mag     e_<Vmag>  []? Error on <V>
  72- 76  F5.2   mag       <Rmag>  []? Average of R magnitude <R>
  78- 81  F4.2   mag     e_<Rmag>  []? Error on <R>
  83- 87  F5.2   mag       <Imag>  []? Average of I magnitude <I>
  89- 92  F4.2   mag     e_<Imag>  []? Error on <I>
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(End)                                             Simona Mei [CDS]   07-Jun-1995