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J/AJ/109/817         Photometry of WN8 Stars                    (Antokhin+ 1995)
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The Enigmatic WN8 Stars: Intensive Photometry of Four Southern Stars on Time
Scales From 30 min to 3 Months
    Antokhin I., Bertrand J.-F., Lamontagne R., Moffat A.F.J., Matthews J.
    <Astron. J. 109, 817 (1995)>
    =1995AJ....109..817A
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ADC_Keywords: Stars, Wolf-Rayet; Photometry 

Abstract:
  We present the first results of an extensive photometric study of the
  most intrinsically variable Wolf-Rayet stars: the WN8 subclass.  Some
  375 individual differential observations of WR16 and WR40 were obtained
  over a contiguous interval of ~3 months in a narrow visual continuum
  bandpass.  Over the same interval, we obtained roughly 200 broadband V
  observations of the fainter WN8 stars WR66 and WR82.  All four WN8
  stars show significant random variability on time scales of hours to ~a
  day -- probably related to the stochastic formation, propagation, and
  decay of emitting/scattering inhomogeneities in the winds.  Unlike for
  WR66 and WR82, the photometric behaviour of WR16 and WR40 is more
  deterministic with ~two possible periods in the range ~2-30 days --
  possibly related to some kind of LBV, binary, or rotation phenomenon.
  In addition, WR82 shows a possible secular decline during the 3 months
  and WR66 reveals a clear periodicity of 3.51 h.  This short period may
  be related to nonradial pulsations or a spiral-in binary process
  invoking a low-mass, compact companion as seen in the massive x-ray
  binary Cyg X-3, a WN7 + c system of period 4.8 h.


File Summary:
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 FileName    Lrecl    Records   Explanations
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ReadMe          80          .   This file
table1.dat      79          8   Comparison stars for the WN8 stars
table2          33        367   Narrowband visual photometry for WR16
table3          33        381   Narrowband visual photometry for WR40
table4          33        219   Broadband visual photometry for WR66
table5          33        163   Broadband visual photometry for WR82
table.tex       69          9   LaTeX document to format tables 2, 3, 4, & 5
table2.tex      67        382   AASTeX version of Table 2
table3.tex      67        396   AASTeX version of Table 3
table4.tex      66        234   AASTeX version of Table 4
table5.tex      66        178   AASTeX version of Table 5
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Byte-by-byte Description of file: table1.dat
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   Bytes Format  Units    Label      Explanations
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   1- 4   A4     ---      WR         WR number
   6-14   A9     ---      Other      Other name
  15-20   F6.2   mag      vmag       []? v magnitude
  21-25   F5.2   mag      b-v        []? b-v color
  28-29   A2     ---      Cmp        Comparison star number (C1 or C2)
  31-39   A9     ---      Name       Comparison star name
  41-42   A2     ---      Sp         Spectral type
  43-47   F5.1   mag      Vmag       V magnitude
  48-55   F8.4   mag      WR-C       Difference between comparison and WR
  56-63   F8.4   mag      e_WR-C     Error (sigma) in WR-C
  64-71   F8.4   mag      C2-C1      ? Difference between comparison star
  72-79   F8.4   mag      e_C2-C1    ? Error (sigma) in C2-C1
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Byte-by-byte Description of file: table2 table3 table4 table5
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   Bytes Format  Units   Label    Explanations
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   1- 12  F12.4  d       HJD      Heliocentric Julian Date
  14- 19  F6.4   mag     WR-C1    WR-C1 differential magnitude
  21- 26  F6.4   mag     WR-C2    WR-C2 differential magnitude
  28- 33  F6.4   mag     C2-C1    C2-C1 differential magnitude
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Origin: AAS CD-ROM series, Volume 4, 1995         Lee Brotzman [ADS] 26-Apr-1995
        (JD completed at CDS)
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(End)                                                         [CDS]  11-Jul-1995