Access to Astronomical Catalogues

J/A+AS/132/83       BVRI photometry of 7 BL Lac objects (Bai+ 1998)
The intraday variability in the radio-selected and X-ray-selected BL Lac objects
       Bai J.M, Xie G.Z., Li K.H., Zhang X., Liu W.W.
      <Astron. Astrophys. Suppl. Ser. 132, 83 (1998)>
      =1998A&AS..132...83B      (SIMBAD/NED BibCode)
ADC_Keywords: BL Lac objects ; Photometry, UBVRI

Keywords: BL Lacertae objects: general - galaxies: photometry


Abstract:
    Seven BL Lac objects have been photometrically observed in an effort
    to study the difference of optical intraday variability between the
    radio-selected BL Lac objects (RBLs) and X-ray-selected BL Lac objects
    (XBLs). The objects we observed are selected arbitrarily. They are
    four RBLs, PKS 0735+178, PKS 0754+101, OJ 287 and BL Lac, and three
    XBLs, H 0323+022, H 0548-322 and H 2154-304. During the observation
    all of them exhibited microvariation, and H 0323+022 and H 0548-322
    sometimes showed brightness oscillation. PKS 0735+178 and BL Lac were
    in their faint states and not very active. It seems that RBLs do not
    show microvariability more frequently than XBLs.
Objects:
    ----------------------------------------------------------
       RA   (2000)   DE      Designation(s)
    ----------------------------------------------------------
    22 02 43.3   +42 16 40   BL Lac
    03 26 13.8   +02 25 15   H 0323+022
    05 50 41.5   -32 16 09   H 0548-322
    21 58 51.9   -30 13 30   H 2154-304
    08 54 48.9   +20 06 31   OJ 287 = PKS 0851+203
    07 38 07.4   +17 42 19   PKS 0735+178
    07 57 06.7   +09 56 35   PKS 0754+101
    ----------------------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table2.dat        48      341   Photometric data of seven BL Lac objects


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

   Bytes Format  Units     Label   Explanations

   1-  8  A8    "DD/MM/YY" Date    Observation date
  10- 20  F11.3  d         JD      Julian Date
  22- 26  F5.2   mag       mag     Magnitude
  28- 30  F3.2   mag       e_mag   One sigma uncertainty on mag
      33  A1     ---       Band    [BVRI] Filter used
  37- 48  A12    ---       Object  Name of the object observed


Acknowledgements: Bifang LIU 

(End)                                         Patricia Bauer [CDS]   25-Jun-1998