J/A+A/384/1050 Interstellar polarization. VI. (Berdyugin+, 2002)
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 2002A&A...384.1050B
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°) extends further towards lower latitudes. Especially, we
have found a new dust formation in the area 35°<l<45°,
57°<b<63°. Interstellar polarization in this part of the sky
peaks at 0.7%, which gives a lower limit to the extinction
AV>0.23mag. Polarization vectors in this cloud are very well aligned
along the direction of l=50°. 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:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 52 102 New polarization measurements
--------------------------------------------------------------------------------
See also:
J/A+A/372/276 : Polarization catalogue for NGP area (Berdyugin+, 2001)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
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
--------------------------------------------------------------------------------
Note (1): Source of polarisation data:
1: from the KVA 60 cm telescope
2: from the NOT 2.56 m telescope
--------------------------------------------------------------------------------
History:
* 08-Jun-2002: the BD number originally written "+91 2793" was
corrected to "+19 2793"
Acknowledgements: Andrei Berdyugin
References:
Berdyugin et al., Paper I 1995A&A...294..568B 1995A&A...294..568B
Berdyugin & Teerikorpi, Paper II 1997A&A...318...37B 1997A&A...318...37B
Berdyugin et al., Paper III 2000A&A...358..717B 2000A&A...358..717B
Berdyugin et al., Paper IV 2001A&A...372..276B 2001A&A...372..276B, Cat. J/A+A/372/276
Berdyugin & Teerikorpi, Paper V 2001A&A...368..635B 2001A&A...368..635B
(End) Patricia Bauer [CDS] 15-Mar-2002