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J/PAZh/25/893         Optical outbursts of the blazar 3C 345    (Belokon+, 1999)
Spectral slope of the emission in "fast" and "slow" optical outbursts
of the blazar 3C 345.
       Belokon E.T., Babadzhanyants M.K.
      <Pis'ma Astron. Zh. 25, 893 (1999)>
      =1999PAZh...25..893B
      =1999AstL...25..781B
ADC_Keywords: QSOs ; Photometry, UBV ; Photometry, photographic


Abstract:
    We present photographic UBV photometry of the blazar 3C 345 that were
    made during 79 nights in 1971-1974 and 1983-1984 as a part of the
    Petersburg Quasar Monitoring Program (PQMP) carried out at the
    Astronomical Institute of the St.-Petersburg University. These data
    were previously published by piecemeal (references are presented in
    Section 4). Now after partial revision these data are united in Table
    1 that presents nightly averaged UBV magnitudes together with its rms
    errors (see Section 4 of the paper for the details). These data were
    used for the comparison of the spectral indices of the emission in the
    "fast" (time scales of nearly 10-20 days) and "slow" (time scales of
    nearly 1 yeas) outbursts in 3C 345.
Object:
    ----------------------------------------------------------------------
        RA   (2000)   DE      Designation
    ----------------------------------------------------------------------
     16 42 58.9   +39 48 37   3C 345 = B2 1641+39 = DA 420 = 1ES 1641+399
    ----------------------------------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        59       79   Photographic UBV photometry 3C 345


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

   Bytes Format     Units      Label   Explanations

   1-  8  A8        "DD/MM/YY" Date    Observation date
  11- 20  F10.2     d          JD      [2441073/2445439] Julian date
  23- 27  F5.2      mag        Umag    ? U magnitude (1)
  30- 33  F4.2      mag        e_Umag  ? Standard error in Umag (2)
  36- 40  F5.2      mag        Bmag    ? B magnitude (1)
  43- 46  F4.2      mag        e_Bmag  ? Standard error in Umag (2)
  49- 53  F5.2      mag        Vmag    ? V magnitude (1)
  56- 59  F4.2      mag        e_Vmag  ? Standard error in Umag (2)

Note (1): The magnitude estimates in U, B, V bands.
          If there were several magnitude estimates during a night,
           then their mean is given;
Note (2): rms errors calculated from the typical errors for the single
           estimation (0.07mag for B and V; 0.10mag for U) and then the number
           of the estimates were averaged.

(End)                          Veta Avedisova   [INASAN]             05-May-2000