Interstellar polarization at high galactic latitudes from distant stars. 2: First results for Z less than or equal to 600 PC

Details Interstellar polarization at high galactic latitudes from distant stars. 2: First results for Z less than or equal to 600 PC Interstellar polarization at high galactic latitudes from distant stars. 2: First results for Z less than or equal to 600 PC

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...294..568b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 294, no. 2, p. 568-574

Astronomy and Astrophysics

Astrophysics

19

Astronomical Polarimetry, Interstellar Extinction, Milky Way Galaxy, Stars, Linear Polarization, Magnetic Fields, Solar Neighborhood

Scientific paper

We present the first results from our Crimean-Tuorla program for polarimetry of distant stars at high galactic latitudes. The available observations reveal a clear increase in the interstellar linear polarization of A and F stars, up to Z approximately equals 600 pc where one reaches PV approximately equals 0.25%. This means an average AB greater than or equal to 0.11 mag over the northern polar cap for the diffuse component of the interstellar extinction that we are probing. There is no clear indication in the data that the asymptotic level of PV has been reached, and with future observations above Z = 600 pc we shall investigate this question. The trend found is in agreement with the stellar reddening analysis by Teerikorpi (1990). The directions of the plane of vibration are in agreement with Markkanen's (1979) analysis of closer (Z less than 200 pc) stars in his 'Area II'. Outside of this area we define two sectors B and C which encompass the Local Spiral Arm and had little stars in previous investigations. Here the polarization vectors deviate strongly from those in Markkanen's Area II, where one is probably looking at an interarm region, close to the edge of the Local Spiral Arm. Our measurements indicate for B and C average polarization vectors consistent with the direction l approximately equals 110 deg obtained by other authors for the magnetic field in the Local Spiral Arm using the rotation measure method.

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