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J/A+A/385/55        Long-Term Polarization of BL Lac        (Hagen-Thorn+ 2002)
Analysis of the long-term polarization behaviour of BL Lac.
     Hagen-Thorn V.A., Larionova E.G., Jorstad S.G., Bjornsson C.-I.,
     Larionov V.M.
    <Astron. Astrophys. 385, 55 (2002)>
    =2002A&A...385...55H
ADC_Keywords: BL Lac objects ; Polarization

Keywords: BL Lac objects: individual: BL Lac - techniques: polarimetric


Description:
    Both photometric and polarimetric data of BL Lac were obtained with
    the .5-m telescopes of the Byurakan station of the Astronomical
    Institute of St.-Petersburg University.
Objects:
    ----------------------------------------------------------
       RA   (2000)   DE      Designation(s)
    ----------------------------------------------------------
    22 02 43.3   +42 16 40   BL Lac = QSO B2200+420
    ----------------------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        71      451   Polarisation parameters


See also:
        II/206 : Stellar Polarization Bibliography (Belous, 1996)
        II/226 : Stellar polarization catalogs agglomeration (Heiles, 2000)
 J/A+A/332/410 : Quasar polarization (Hutsemekers 1998)
 J/A+A/340/371 : Quasar polarization of BAL and lensed QSOs (Hutsemekers+ 1998)
 J/A+A/353/77  : Variability + polarization of luminous QSOs (Teerikorpi+, 2000)


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

   Bytes Format Units   Label     Explanations

   2- 12  F11.3 d       JD        Julian Date of Observation
  16- 20  F5.3  mJy     I         Intensity of radiation in B band (1)
  23- 28  F6.3  mJy     Q         Q Stokes parameter (in B band)
  31- 36  F6.3  mJy     U         U Stokes parameter (in B band)
  39- 45  F7.3  %       Px        Relative Stokes parameter Q/I (in B band)
  48- 54  F7.3  %       Py        Relative Stokes parameter U/I (in B band)
  58- 63  F6.3  %       p         Polarization degree (in B band)
  67- 71  F5.1  deg     Theta     Polarizaton electric vector direction
                                        (North through East)

Note (1): Both intensity and polarization parameters refer to BL Lac central
     point source (host galaxy subtracted)


Acknowledgements: Valeri Larionov 

(End)                                        Patricia Bauer  [CDS]   06-Feb-2002