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J/A+AS/131/401      Southern peculiar early-type stars polarimetry (Yudin+ 1998)
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Polarimetry of southern peculiar early-type stars
       Yudin R.V., Evans A.
      <Astron. Astrophys. Suppl. Ser. 131, 401 (1998)>
      =1998A&AS..131..401Y      (SIMBAD/NED BibCode)
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ADC_Keywords: Stars, early-type ; Polarization
Keywords: polarization - circumstellar matter - stars: emission-line; Be -
          stars: pre-main sequence

Abstract:
    We present and discuss optical polarimetry of a large group
    (60 objects) of peculiar early-type stars (Herbig Ae/Be stars and
    candidate members, B[e] stars, extreme emission line objects etc.).
    Most were taken from ``A new catalogue of members and candidate
    members of Herbig Ae/Be stellar group'' The et al. (1994,
    Cat. <J/A+AS/104/315>). For 40 out of the 60 objects polarization was
    measured for the first time. On the basis of the data we draw
    conclusions about the circumstellar shell configuration and
    orientation for several objects. Polarimetric variability on different
    time-scales (minutes...hours...days) was investigated, as well as
    comparison with earlier measurements to investigate variability over
    longer time-scales. No circular polarization was detected to a
    5{sigma} level in most of the investigated stars. Polarimetric data
    obtained here as well as data available from the literature were
    analyzed from the point of investigating the evolutionary status of
    the objects. The relationship between the polarimetric and photometric
    data was also investigated.

File Summary:
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  FileName      Lrecl  Records   Explanations
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ReadMe             80        .   This file
position.dat       35       59   Star positions
tables.dat         94      786   Polarimetry
tab6-11.tex        95      589   LaTeX version of tables 6 to 11
tab12-16.tex       97      434   LaTeX version of tables 12 to 16
tab17-22.tex       95      561   LaTeX version of tables 17 to 22
tab6-11.ps         72     1147   PostScript version of the tables (Part. 1)
tab12-16.ps        72     1110   PostScript version of the tables (Part. 2)
tab17-22.ps        72     1143   PostScript version of the tables (Part. 3)
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See also:
   J/A+AS/104/315 : Member of Herbig Ae/Be stellar group (The+ 1994)

Byte-by-byte Description of file: position.dat
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   Bytes Format Units   Label     Explanations
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   1- 10  A10   ---     Name      Star name
  13- 14  I2    h       RAh       Right ascension (J2000.0)
  16- 17  I2    min     RAm       Right ascension (J2000.0)
  19- 22  F4.1  s       RAs       Right ascension (J2000.0)
      24  A1    ---     DE-       Declination sign
  25- 26  I2    deg     DEd       Declination (J2000.0)
  28- 29  I2    arcmin  DEm       Declination (J2000.0)
  31- 32  I2    arcsec  DEs       Declination (J2000.0)
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Byte-by-byte Description of file: tables.dat
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   Bytes Format Units   Label   Explanations
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   1- 10  A10   ---     Name    Star name
  12- 24  F13.5 d       HJD     Julian date of the middle of observation
  26- 29  A4    ---     Filt    Filter used
  31- 34  I4    s       Tint    Basic integration time for the corresponding
                                 filter
  36- 37  I2    ---     Nint    Number of integrations from which the values
                                 were obtained
  39- 44  F6.3  %       Plin    Linear polarisation
  46- 50  F5.3  %     e_Plin    rms uncertainty on Plin
  52- 56  F5.1  deg     PA      Equatorial position angle
  58- 61  F4.1  deg   e_PA      rms uncertainty on PA (North through East)
  63- 66  F4.1  deg     sigma1  Internal error in PA (1)
  68- 73  F6.3  %       U       U Stokes parameter (x100)
  75- 80  F6.3  %       Q       Q Stokes parameter (x100)
  82- 88  F7.3  %       Pcirc   Circular polarization
  90- 94  F5.3  %     e_Pcirc   rms uncertainty on Pcirc
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Note (1): Internal error calculated from photon counting statistics
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Acknowledgements: Ruslan Yudin <ruslan@pulkovo.spb.su>
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(End)                                         Patricia Bauer [CDS]   06-Apr-1998