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J/A+A/384/504       Broadband polarimetry of novae in outburst (Evans+, 2002)
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Broadband polarimetry of novae in outburst.
    Evans A., Yudin R.V., Naylor T., Ringwald F.A., Koch Miramond L.
   <Astron. Astrophys. 384, 504 (2002)>
   =2002A&A...384..504E
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ADC_Keywords: Novae ; Binaries, cataclysmic ; Polarization
Keywords: polarization - stars: circumstellar matter -
          stars: novae, cataclysmic variables

Abstract:
    We present broadband optical polarimetry of the classical novae
    V705 Cas, V4362 Sgr, V2313 Oph and BY Cir in outburst. The data
    indicate that, in all cases, there is an intrinsic component of
    polarization and in some cases the variability is very rapid, on a
    time-scale ~1day. In the case of V705 Cas, we suggest that the origin
    of the intrinsic component may lie in the clumpiness and/or
    inhomogeneities of the ejecta, while electron scattering is the most
    likely cause in V2313 Oph. The wavelength-dependence of polarization
    in the case of V4362 Sgr suggests scattering by small dust grains,
    while polarization in resonance lines is the most probable cause of
    the observed polarization in BY Cir.

Objects:
    -----------------------------------------
       RA   (2000)   DE    Designation(s)
    -----------------------------------------
    14 44 53.6 -63 53 56   BY Cir
    17 35 44.6 -19 19 34   V2313 Oph
    18 30 22.0 -17 12 06   V4362 Sgr
    23 41 47.3 +57 31 00   V705 Cas
    -----------------------------------------

File Summary:
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 FileName      Lrecl  Records   Explanations
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ReadMe            80        .   This file
table2.dat        83       65   Polarimetric data for novae
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Byte-by-byte Description of file: table2.dat
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   Bytes Format Units   Label     Explanations
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   1- 10  A10   --      Name      Name of source (1)
  12- 21  F10.2 d       JD        JD of mid-observation
  23- 27  F5.1  d       Time      Time since outburst (-9.99 = field star)
  29- 32  A4    --      Site      Observatory name (2)
      34  A1    --      Filter    [UVBRIC] Filters. RI = Cousins
  36- 40  F5.2  mag     Vmag      ?=-9.99 V magnitude estimate
                                   (-9.99 = other filters)
  42- 46  F5.2  %       q         Stokes normalized Q parameter
  48- 51  F4.2  %     e_q         1sigma error in Q
  53- 57  F5.2  %       u         Stokes normalized U parameter
  59- 62  F4.2  %     e_u         1sigma error in U
  64- 67  F4.2  %       P         Polarization
  69- 72  F4.2  %     e_P         1sigma error in Polarization
  74- 78  F5.1  deg     Theta     Position angle
  80- 83  F4.1  deg   e_Theta     1sigma error in Position angle
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Note (1): A number of field stars were also observed; they are designated as
     Sgr star a, Sgr star b and Sgr star c for V4362 Sgr field stars,
     Cas star b and Cas star e for V705 Cas field stars,
     Cir star a, Cir star c and Cir star d for BY Cir field stars, and
     Oph star a for V2313 Oph field star.
     The finding charts are in the paper.
Note (2): Sites:
    SAAO: Observations at South African Astronomical Observatories were
          carried out during 1994 August 2-15 and 1995 January 23-February 6.
          The University of Cape Town (UCT) photometer-polarimeter module
          was used on the SAAO 0.75m telescope, although the observations
          for the period 1994 August 9-15 were carried out on the
          SAAO 1m telescope.
     PdM: observations at the Pic du Midi were carried out with the
          Sterenn polarimeter at the Cassegrain focus of the 2m
          Bernard Lyot telescope during the period 1994 July 2-July 15.
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Acknowledgements: Aneurin Evans <ae@astro.keele.ac.uk>
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(End)                                        Patricia Bauer [CDS]    05-Mar-2002