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J/A+A/384/1050     Interstellar polarization. VI.            (Berdyugin+, 2002)
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Interstellar polarization at high galactic latitudes from distant stars.
 VI. Extended polarization map and connection with the local spiral structure.
    Berdyugin A., Teerikorpi P.
      <Astron. Astrophys. 384, 1050 (2002)>
      =2002A&A...384.1050B      (SIMBAD/NED BibCode)
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ADC_Keywords: Polarization ; Galactic pole, north
Keywords: polarization - ISM: dust, extinction - Galaxy: structure -
          Galaxy: general

Abstract:
    We present new interstellar polarization measurements for 116 stars at
    high galactic latitudes. Our data show that Markkanen's cloud - the
    main polarization structure seen in the North Galactic Pole area
    (b>75{deg}) extends further towards lower latitudes. Especially, we
    have found a new dust formation in the area 35{deg}<l<45{deg},
    57{deg}<b<63{deg}. Interstellar polarization in this part of the sky
    peaks at 0.7%, which gives a lower limit to the extinction
    A_V_>0.23mag. Polarization vectors in this cloud are very well aligned
    along the direction of l=50{deg}. On the IRAS 100 micron map this dust
    structure shows up as a bright emission area. We discuss the new
    polarization map extending from circumpolar to lower latitudes and
    point out features which suggest that Markkanen's cloud may be a part
    of the dust lane in the inner edge of the local spiral or spur.

File Summary:
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 FileName      Lrecl  Records   Explanations
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ReadMe            80        .   This file
table1.dat        52      102   New polarization measurements
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See also:
   J/A+A/372/276 : Polarization catalogue for NGP area (Berdyugin+, 2001)

Byte-by-byte Description of file: table1.dat
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   Bytes Format Units   Label     Explanations
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   1-  9  A9    ---     BD        BD number of the star
  11- 14  F4.2  %       Pol       Polarization percentage.
      16  I1    ---   r_Pol       [1-2] Source of data (1)
  18- 21  F4.2  %     e_Pol       Error of polarization measurement
  23- 25  I3    deg     theta     ? Position angle of polarization vector
                                     measured in the equatorial coordinate frame
  27- 28  I2    deg   e_theta   ? Error of position angle measurement
  30- 32  I3    pc      Dist      Distance to the star
  34- 39  F6.2  deg     GLON      Galactic longitude
  41- 45  F5.2  deg     GLAT      Galactic latitude
  47- 51  A5    ---     SpType    Spectral type, when available
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Note (1): Source of polarisation data:
           1: from the KVA 60 cm telescope
           2: from the NOT 2.56 m telescope
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Acknowledgements: Andrei Berdyugin <andrei@oj287.astro.utu.fi>

References:
   Berdyugin et al.,       Paper I     1995A&A...294..568B
   Berdyugin & Teerikorpi, Paper II    1997A&A...318...37B
   Berdyugin et al.,       Paper III   2000A&A...358..717B
   Berdyugin et al.,       Paper IV    2001A&A...372..276B, Cat. <J/A+A/372/276>
   Berdyugin & Teerikorpi, Paper V     2001A&A...368..635B
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(End)                                        Patricia Bauer [CDS]    15-Mar-2002