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J/A+A/383/580    BV polarimetric variability of 3 O-type stars   (Clarke+, 2002)
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On the polarimetric variability of bright O-type stars.
    Clarke D., McDavid D., Smith R.A., Henrichs H.F.
      <Astron. Astrophys. 383, 580 (2002)>
      =2002A&A...383..580C      (SIMBAD/NED BibCode)
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ADC_Keywords: Stars, O ; Stars, bright ; Polarization
Keywords: polarization - stars: early-type - stars: individual: {xi} Per -
          stars: individual: {lambda} Cep - stars: individual: 68 Cyg

Abstract:
    Polarimetric data associated with multi-parameter observational
    campaigns of selected bright O-type stars and their variable winds,
    are analysed in relation to the outcomes of the UV and optical
    spectroscopic studies. For the stars {xi} Per and {lambda} Cep,
    individual measurement uncertainties are {Delta}p~+/-0.0002 with
    nightly mean uncertainties of {Delta}p~+/-0.00007. Although
    variability is apparent on a night-to-night basis, with differences in
    {Delta}p~0.0002, no correlations are found between these and the
    periodic behaviours associated with the stellar SiIV and H{alpha}
    lines.

Objects:
    ----------------------------------------------------------
       RA   (2000)   DE     Designation(s)
    ----------------------------------------------------------
    03 58 57.9   +35 47 28  xi Per = HR 1228
    22 11 30.6   +59 24 52  lambda Cep = HR 8469
    21 18 27.2   +43 56 45  68 Cyg = HR 8154
    ----------------------------------------------------------

File Summary:
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 FileName      Lrecl  Records   Explanations
--------------------------------------------------------------------------------
ReadMe            80        .   This file
tablev.dat        64       48   Polarimetric data (V-band) from the 1991 October
                                 campaign for {xi} Per, {lambda} Cep and 68 Cyg
tableb.dat        64      125   Polarimetric data (B-band) form the 1989 October
                                 campaign for {xi} Per and {lambda} Cep
tables.tex        77      249   LaTeX version of the tables
tables.ps         72      442   PostScript version of the tables
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See also:
     J/A+AS/116/257 : Variability in O-stars wind (Kaper+, 1996)

Byte-by-byte Description of file: tableb.dat
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   Bytes Format Units   Label     Explanations
--------------------------------------------------------------------------------
   1- 12  A12   ---     Star      Star name (1)
  14- 25  F12.4 d       HJD       Heliocentric Julain date
  28- 33  F6.3  mag     q         Normalised Stokes parameter, q
  35- 40  F6.3  mag     u         Normalised Stokes parameter, u
  42- 46  F5.3  ---     p(B)      Degree of polarization
  48- 52  F5.3  ---   e_p(B)      rms uncertainty on p(B) (2)
  54- 59  F6.2  deg     theta     Vibration direction, {theta} relative to the
                                   standard equatorial frame
  61- 64  F4.2  deg   e_theta     rms uncertainty on theta (2)
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Note (1): For {xi} Per, data measured in the B-band (with the addition of a
            10% neutral density filter)
Note (2): Estimates for the uncertainty of the p(B) and {theta} based on the
           photon count associated with the individual measurement set.
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Byte-by-byte Description of file: tablev.dat
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   Bytes Format Units   Label     Explanations
--------------------------------------------------------------------------------
   1- 12  A12   ---     Star      Star name
  14- 25  F12.4 d       HJD       Heliocentric Julain date
  28- 33  F6.3  mag     q         Normalised Stokes parameter, q
  35- 39  F5.3  mag     u         Normalised Stokes parameter, u
  41- 46  F6.3  ---     p(V)      Degree of polarization
  48- 52  F5.3  ---   e_p(V)      rms uncertainty on p(B) (1)
  54- 58  F5.3  deg     theta     Vibration direction, {theta} relative to the
                                   standard equatorial frame
  60- 64  F5.3  deg   e_theta     rms uncertainty on theta (1)
--------------------------------------------------------------------------------
Note (1): Estimates for the uncertainty of the p(V) and {theta} based on the
           photon count associated with the individual measurement set.
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Acknowledgements: David Clarke <d.clarke@astro.gla.ac.uk>

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(End)                                          Patricia Bauer [CDS]  20-Dec-2001