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J/A+A/420/447   VRI photometry of lensed quasar QSO B2237+0305  (Vakulik+, 2004)
Color effects associated with the 1999 microlensing brightness peaks in
gravitationally lensed quasar Q2237+0305.
    Vakulik V.G., Schild R., Dudinov V.N., Minakov A.A., Nuritdinov S.N.,
    Tsvetkova V.S., Zheleznyak A.P., Konichek V.V., Sinelnikov I.Ye.,
    Burkhonov O.A.,B.P.Artamonov, Bruevich V.V.
   <Astron. Astrophys. 420, 447 (2004)>
   =2004A&A...420..447V
ADC_Keywords: QSOs ; Gravitational lensing ; Magnitudes

Keywords: cosmology: gravitational lensing -
          galaxies: quasars: individual: QSO 2237+0305 -
          methods: observational - techniques: image processing

Description:
    Spatially resolved CCD photometry of the Q2237+0305 gravitationally
    lensed quasar in V, R and I spectral bands from observations with the
    Maidanak 1.5-m telescope made in 1995-2000 is presented. For each of
    the four quasar components, - A, B, C and D, - stellar magnitudes for
    78 dates in R filter, and for 17 dates in V and I and shown in Tables
    4-6. The color indices V-R and V-I for 17 dates during 1995-2000 are
    also presented (Table 7), which permitted to analyse a behavior of
    colors of the lensed quasar images in microlensing, and to discover a
    significant correlation between the color changes and magnitude
    changes in the sense, that the components tend to become bluer as
    their brightness increases.
Objects:
    ----------------------------------------------------------
       RA   (2000)   DE    Designation(s)
    ----------------------------------------------------------
    22 40 30.3 +03 21 31   QSO J2240+0321 = QSO B2237+030
    ----------------------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table4.dat        72       31   Photometry of Q2237+0305A,B,C,D in the R band
                              from observations in 1995-1999.
table5.dat        70       46   Photometry of Q2237+0305 A,B,C,D in the R band
                              from observation in 2000
table6.dat        64       51   VRI photometry of Q2237+0305 A,B,C,D, 1995-2000
table7.dat        50       17   Color indices (V-R) and (V-I) of Q2237+0305
                              components


See also:
   J/A+A/412/707 : Absorption-line systems in QSO - CoALS (Ryabinkov+, 2003)
   J/ApJS/77/203 : QSO absorption systems (Junkkarinen+ 1991)


Byte-by-byte Description of file: table4.dat

   Bytes Format   Units        Label     Explanations

   1- 10  A10     "YYYY/MM/DD" Obs.Date  Observation date
  12- 16  F5.2    mag          RmagA     R magnitude of the component A
  18- 21  F4.2    mag          e_RmagA   The mean error for A magnitude
  23- 27  F5.2    mag          RmagB     R magnitude of the component B
  29- 32  F4.2    mag          e_RmagB   The mean error for B magnitude
  34- 38  F5.2    mag          RmagC     R magnitude of the component C
  40- 43  F4.2    mag          e_RmagC   The mean error for C magnitude
  45- 49  F5.2    mag          RmagD     R magnitude of the component D
  51- 54  F4.2    mag          e_RmagD   The mean error for D magnitude
  56- 59  F4.2    arcsec       FWHM      Seeing, Full Width on Half Maximum
  61- 66  A6      ---          CCD       CCD camera
  68- 72  F5.3    arcsec/pix   Scale     Scale at the chip plane


Byte-by-byte Description of file: table5.dat

   Bytes Format   Units        Label     Explanations

   1- 10  A10     "YYYY/MM/DD" Obs.Date  Date of observation
  12- 17  F6.3    mag          RmagA     R magnitude of the component A
  19- 23  F5.3    mag          e_RmagA   The mean error for A magnitude
  25- 30  F6.3    mag          RmagB     R magnitude of the component B
  32- 36  F5.3    mag          e_RmagB   The mean error for B magnitude
  38- 43  F6.3    mag          RmagC     R magnitude of the component C
  45- 49  F5.3    mag          e_RmagC   The mean error for C magnitude
  51- 56  F6.3    mag          RmagD     R magnitude of the component D
  58- 62  F5.3    mag          e_RmagD   The mean error for C magnitude
  64- 67  F4.2    arcsec       FWHM      Seeing, Full Width on Half Maximum
  69- 70  I2      ---          NFrame    Number of frames in series


Byte-by-byte Description of file: table6.dat

   Bytes Format   Units        Label     Explanations

   1- 10  A10     "YYYY/MM/DD" Obs.Date  Date of observation
  12- 17  F6.3    mag          magA      Magnitude of component A in Band "Band"
  19- 23  F5.3    mag          e_magA    The mean error for A component
  25- 30  F6.3    mag          magB      Magnitude of component B in Band "Band"
  32- 36  F5.3    mag          e_magB    The mean error for B component
  38- 43  F6.3    mag          magC      Magnitude of component C in Band "Band"
  45- 49  F5.3    mag          e_magC    The mean error for C component
  51- 56  F6.3    mag          magD      Magnitude of component D in Band "Band"
  58- 62  F5.3    mag          e_magD    The mean error for D component
      64  A1      ---          Band      [VRI] Spectral band


Byte-by-byte Description of file: table7.dat

   Bytes Format   Units        Label     Explanations

   1- 10  A10     "YYYY/MM/DD" Obs.Date  Date of observation
  12- 15  F4.2    mag          (V-R)A    Color-index (V-R) for component A
  17- 20  F4.2    mag          (V-I)A    Color-index (V-I) for component A
  22- 25  F4.2    mag          (V-R)B    Color-index (V-R) for component B
  27- 30  F4.2    mag          (V-I)B    Color-index (V-I) for component B
  32- 35  F4.2    mag          (V-R)C    Color-index (V-R) for component C
  37- 40  F4.2    mag          (V-I)C    Color-index (V-I) for component C
  42- 45  F4.2    mag          (V-R)D    Color-index (V-R) for component D
  47- 50  F4.2    mag          (V-I)D    Color-index (V-I) for component D


Acknowledgements: Victor Vakulik 

(End)                                          Patricia Bauer [CDS]  23-Mar-2004