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J/A+A/466/1031      Photometry of DE CVn             (van den Besselaar+, 2007)
DE CVn: a bright, eclipsing red dwarf - white dwarf binary.
    van den Besselaar E.J.M., Greimel R., Morales-Rueda L., Nelemans G.,
    Thorstensen R., Marsh T.R., Dhillon V.S., Robb R.M., Balam D.D.,
    Guenther E.W., Kemp J., Augusteijn T., Groot P.J.
   <Astron. Astrophys. 466, 1031 (2007)>
   =2007A&A...466.1031V
ADC_Keywords: Binaries, eclipsing ; Photometry

Keywords: stars: individual: DE CVn - stars: binaries: eclipsing -
          stars: binaries: close - stars: late-type - stars: white dwarfs -
          stars: fundamental parameters

Abstract:
    Close white dwarf-red dwarf binaries must have gone through a
    common-envelope phase during their evolution. DE CVn is a detached
    white dwarf-red dwarf binary with a relatively short (∼8.7h) orbital
    period. Its brightness and the presence of eclipses makes this system
    ideal for a more detailed study.

    From a study of photometric and spectroscopic observations of DE CVn
    we derive the system parameters that we discuss in the framework of
    common-envelope evolution.

Description:
    These are photometric observations of the eclipsing red dwarf - white
    dwarf binary DE CVn. The observations have been taken with a number of
    telescopes and instruments between 1997 and 2006. UVic is the
    automatic 0.5-meter telescope of the Climenhage Observatory in
    Victoria, Canada. DAO is the 1.8-meter telescope of the Dominion
    Astrophysical Observatory in Victoria, Canada. MDM is the 1.3-meter
    telescope of the Michigan-Dartmouth-MIT Observatory in Arizona.
    ULTRACAM has been used on the 4.2-meter William Herschel Telescope to
    simultaneously obtain u', g' and i' data. The data is given in
    Heliocentric Julian Date, phase and differential magnitude.
Objects:
    --------------------------------------------
       RA   (2000)   DE      Designation(s)
    --------------------------------------------
    13 26 54.3   +45 32 55   DE CVn = V* DE CVn
    --------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        98        9   List of light curves
uvic_r.dat        39     1109   UVic R (12+21+22+24 April 1997, 02+08 May 1997,
                             01 Jul 1998, 21 May 2001)
uvic_v.dat        39       39   UVic V (08 May 1997)
uvic_cle.dat      39      965  *UVic clear (10 May 1997, 02 Jun 2001, 05 Apr 2006)
dao_b.dat         39      149   DAO B (26 May 2001, 30 May 2002)
mdm_b.dat         52      709   MDM B (21 Jan 2002, 03 Feb 2003, 19 Jun 2003)
mdm_bg38.dat      52      813   MDM BG38 (24 Jan 2002, 01 Jul 2002)
ultrac_g.dat      51    19977   ULTRACAM g' (22+24+25 May 2003, 04 May 2004)
ultrac_i.dat      51    20090   ULTRACAM i' (22+24+25 May 2003, 04 May 2004)
ultrac_u.dat      51    20240   ULTRACAM u' (22+24+25 May 2003, 04 May 2004)

Note on uvic_cle.dat: The observations taken on 09 May 1997 and 17 March 2000
   are not available electronically.


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

   Bytes Format Units   Label     Explanations

   1- 12  A12   ---     FileName  Name of the file containing the ligth curve
  14- 18  A5    ---     Filt      Filter (1)
  20- 24  I5    ---     Nobs      Number of observations
  26- 33  A8    ---     Inst      Instrument used for observation (2)
  35- 98  A64   ---     Dates     Dates of observations

Note (1): BG38 = Schott Blue-Green filter.

Note (2): Instruments as follows:
     UVic = automatic 0.5-m telescope of the Climenhage Observatory
            in Victoria, Canada
     DAO  = 1.8-m telescope of the Dominion Astrophysical Observatory
     MDM  = 1.3-m telescope of the Michigan-Dartmouth-MIT Observatory
            in Arizona
 ULTRACAM = ULTRACAM 4.2-m William Herschel Telescope on La Palma


Byte-by-byte Description of file: uvic*.dat dao_b.dat

   Bytes Format Units   Label     Explanations

   1- 13  F13.5 d       HJD       Heliocentric Julian Date
  16- 24  F9.6  ---     Phase     Orbital phase
  27- 33  F7.4  mag     dmag      Differential magnitude in R,V, clear or
                                   B filter (1)
  35- 39  A5    ---     Band      [RVB clear] Band of the magnitude

Note (1): For "clear" filter, not all observations use the same
          comparison star for the differential magnitudes


Byte-by-byte Description of file: mdm*.dat

   Bytes Format Units   Label     Explanations

   1- 14  F14.6 d       HJD       Heliocentric Julian Date
  17- 25  F9.6  ---     Phase     Orbital phase
  28- 36  F9.6  mag     dmag      Differential magnitude in B or BG38 filter
  40- 47  F8.6  mag     e_dmag    ?=0 Uncertainty on differential magnitude
  49- 52  A4    ---     Band      [B BG38] Band on the magnitude


Byte-by-byte Description of file: ultrac*.dat

   Bytes Format Units   Label     Explanations

   1- 18 F18.10 d       HJD       Heliocentric Julian Date
  20- 28  F9.6  ---     Phase     Orbital phase
  30- 38  F9.6  mag     dmag      Differential magnitude in u', g' or i' band
  41- 48  F8.6  mag     e_dmag    Uncertainty on differential magnitude
  50- 51  A2    ---     Band      [u' g' i'] Band of the magnitude


Acknowledgements:
    Else van den Besselaar, besselaar(at)astro.ru.nl
(End)                                        Patricia Vannier [CDS]  08-Feb-2007