Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...317..207v&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 317, June 1, 1987, p. 207-219.
Astronomy and Astrophysics
Astrophysics
12
Interstellar Magnetic Fields, Shock Fronts, Star Formation, Supernova Remnants, Magnetohydrodynamic Stability, Nebulae, Polarization Characteristics, Star Clusters
Scientific paper
Results are presented from a linear polarization survey at optical wavelengths of over 140 stars in the direction of the CMa R1 star-formation region; 26 of these are clearly associated with nebulosity within the area. The observations were obtained in order to test the argument of Herbst et al. (1978) that star formation in CMa R1 is driven by a shock wave from a nearby supernova (Herbs and Assousa, 1977 and 1978). The polarizations are found to be consistent with a simple model of the compression by a supernova-induced spherical shock front of an initially uniform interstellar magnetic field. The polarization vectors are inconsistent with a scenario of quiescent cloud collapse along magnetic-field lines. Multicolor polarimetry of the nebular stars provides evidence of grain growth toward increasing cloud optical depth, characterized by a ratio of total-to-selective extinction of R = 3.0 at E(B-V) = 0.23, increasing to R = 4.2 at E(B-V) = 0.7.
Baierlein Ralph
Herbst William
Vrba Fred J.
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