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J/A+AS/132/361      Optical observations of eight BL Lacs (Raiteri+ 1998)
Optical observations of eight X-ray selected BL Lacertae objects
       Raiteri C.M., Villata M., De Francesco G., Lanteri L., Cavallone M.,
       Sobrito G.
      <Astron. Astrophys. Suppl. Ser. 132, 361 (1998)>
      =1998A&AS..132..361R      (SIMBAD/NED BibCode)
ADC_Keywords: BL Lac objects ; Magnitudes

Keywords: galaxies: active - BL Lacertae objects: general


Description:
    Optical data in the Johnson's BV and Cousins' R bands are presented
    for eight X-ray selected BL Lacertae objects that have recently been
    pointed by the Satellite per Astronomia X `Beppo'(BeppoSAX). The
    observations were done with the 1.05m telescope of the Torino
    Astronomical Observatory and the observational periods include, or are
    close to, the satellite pointings. These data provide optical
    information on sources that have been rarely observed in the optical
    band. Moreover, they can be compared to the X-ray ones for a better
    understanding of the emission properties of these objects. Variability
    on short time scales (a few days) was found for MS 0317.0+1834,
    1ES 0347-121, and MS 0737.9+7441.

    For a description of the (RI)c photometric system, see e.g. the
    General Catalog of Photometric Data GCPD/54

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
tab2-9.dat        34      144   BVR observations
mean.dat          66       20   Observations


See also:
  J/A+AS/116/403 : RI photometry of stars in 12 BL Lac objects (Fiorucci+, 1996)
  J/A+AS/144/481 : BVRI photometry of five BL Lacs  (Villata+, 2000)


Byte-by-byte Description of file: tab2-9.dat

   Bytes Format   Units   Label     Explanations

   1-  8  A8      ---     BLLac     Source designation
  10- 21  F12.4   d       HJD       Heliocentric Julian date
      23  A1      ---     Band      [VRB] Band
  25- 29  F5.2    mag     mag       Magnitude in the band Band
  31- 34  F4.2    mag     e_mag     rms uncertainty on mag


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

   Bytes Format   Units   Label     Explanations

   1-  8  A8      ---     BLLac     Source designation
  10- 11  I2      h       RAh       Right ascension (J2000.0) (from Simbad)
  13- 14  I2      min     RAm       Right ascension (J2000.0) (from Simbad)
  16- 19  F4.1    s       RAs       Right ascension (J2000.0) (from Simbad)
      21  A1      ---     DE-       Declination sign
  22- 23  I2      deg     DEd       Declination (J2000.0) (from Simbad)
  25- 26  I2      arcmin  DEm       Declination (J2000.0) (from Simbad)
  28- 29  I2      arcsec  DEs       Declination (J2000.0) (from Simbad)
      31  A1      ---     Band      [VRB] Band
  33- 40  A8   "DD/MM/YY" Date1     Observation date (beginning)
      42  A1      ---     ---       [-] Separation dash
  44- 51  A8   "DD/MM/YY" Date2     Observation date (end)
  53- 57  F5.2    mag     magmin    ? Minimum magnitude
  59- 63  F5.2    mag     magmax    ? Maximum magnitude
  65- 66  I2      ---     Nobs      Number of observations


Acknowledgements: Claudia M. Raiteri 

(End)       C.M. Raiteri [], Patricia Bauer [CDS] 11-Aug-1998