Other
Scientific paper
Nov 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....108.1834v&link_type=abstract
The Astronomical Journal (ISSN 0004-6256), vol. 108, no. 5, p. 1834-1842
Other
6
Astronomical Polarimetry, H Ii Regions, Interstellar Matter, Polarization (Waves), Star Clusters, Star Distribution, Stellar Color, Visible Spectrum, Interplanetary Magnetic Fields, Polarimeters
Scientific paper
We present UBVRI polarimetric observations of 30 stars belonging to the rich stellar aggregate IC 2944, which is embedded in an extensive H II region. Within the galaxy, it is located at the inner border of the Carina spiral feature. To analyze the characteristics of the interstellar material associated with the aggregate, we have separated the frontside contribution of both color excesses and polarizations, leaving the intra-arm values of these quantities. We have found that the foreground polarization in the direction to IC 2944 is normal and has a bar-lambdamax value of 0.550 +/- 0.025 microns. Its average direction in equatorial coordinates is 91.2 deg. About half of the stars not considered to be frontside have some indication of intrinsic polarization. Interpreting the polarization of the rest as intra-arm polarization, we find that Ardeberg & Maurice's Groups I, II, and III cannot be separated in terms of polarization data and that the Bright Rim Group and Group IV are significantly different from the others. Finally, stars in Groups I, II, III, and IV show that the intra-arm (beyond 1.4 kpc) magnetic field is essentially contained in the plane of the sky.
Marraco Hugo G.
Orsatti Ana Maria
Vega Irene E.
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