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J/A+AS/119/37       EZ CMa UBV & VBLUW photometry              (Duijsens+, 1996)
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Multi-colour photometric and spectroscopic monitoring of the WN5 star
EZ Canis Majoris
       Duijsens M.F.J., van der Hucht K.A., van Genderen A.M., Schwarz H.E.,
       Linders H.P.J., Kolkman O.M.
      <Astron. Astrophys. Suppl. Ser. 119, 37 (1996)>
      =1996A&AS..119...37D      (SIMBAD/NED BibCode)
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ADC_Keywords: Stars, Wolf-Rayet ; Photometry, Vilnius ; Photometry, UBV
Keywords: stars: Wolf-Rayet - stars: individual: WR 6 = HD 50896 = EZ CMa -
          stars: variable - binaries: close

Description:
    We present and analyse photometric and spectroscopic observations of
    the WN5 star EZ Canis Majoris obtained over a period of 7 years. We
    discuss the changing light curve, the shift in phase of the maxima and
    point to flare type variability seen in one night. Small amplitude
    variations are reported in another night. We have investigated the
    change of the average visual magnitude over a time span of 18 years
    and found a tentative cyclic variation with a time scale of
    2425d (6.6yr) with a range of ~0.07mag. This, of course, should be
    verified. If true, a precession phenomenon may offer an explanation.
    The trend of the maximum light amplitude of the 3.766d cycle is also
    investigated and it shows a saw-tooth character with a timescale of
    ~400d. A possible relation with the magnetic activity of the star is
    discussed. We conclude that the line emission variability can be
    caused by both a single star model with an ever-changing wind and a
    binary (WN+NS) model.

Objects:
    --------------------------------------------------------------
         RA  (2000) DE            Name
    --------------------------------------------------------------
    06 54 12.97  -23 55 42.0      EZ CMa = WR 6 = HD 50896
    --------------------------------------------------------------

File Summary:
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  FileName      Lrecl  Records   Explanations
--------------------------------------------------------------------------------
ReadMe             80        .   This file
table7             38      281  *Relative Johnson magnitudes and colours of
                                  January 11 1987 through January 16 1987
table13            56      408  *Relative VBLUW data of EZ CMa, epoch I
table21            56      218  *Relative VBLUW data of EZ CMa, epoch II
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Note on table7: corresponds to tables 7-12 of the printed version
Note on table13: Epoch I = November 25, 1988 through December 23, 1988
                 corresponds to tables 13-20 of the printed version
Note on table21: Epoch II= December  9, 1989 through December 12, 1989
                 corresponds to tables 21-25 of the printed version

See also:
    J/A+A/347/583 : EZ CMa spectroscopy (Georgiev+, 1999)

Byte-by-byte Description of file: table7
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   Bytes Format Units   Label     Explanations
--------------------------------------------------------------------------------
   1- 11  F11.3 d       HJD       Heliocentric julian date
  16- 20  F5.3  mag     DVmag     Relative V Johnson magnitude
  24- 29  F6.3  mag     DB-V      Relative Johnson B-V color
  33- 38  F6.3  mag     DU-B      Relative Johnson U-B color
--------------------------------------------------------------------------------

Byte-by-byte Description of file: table13 table21
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   Bytes Format Units   Label     Explanations
--------------------------------------------------------------------------------
   1- 11  F11.3 d       HJD       Heliocentric julian date
  14- 20  F7.4  mag     DVmag     Relative V magnitude (log intensity)
  23- 29  F7.4  mag     DBmag     Relative B magnitude (log intensity)
  32- 38  F7.4  mag     DLmag     Relative L magnitude (log intensity)
  42- 47  F6.4  mag     DUmag     Relative U magnitude (log intensity)
  51- 56  F6.4  mag     DWmag     Relative W magnitude (log intensity)
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Courtesy: M.F.J. Duijsens <duijsens@strw.LeidenUniv.nl>
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(End)                                         Patricia Bauer [CDS]   14-Feb-1996