Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...317..231b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 317, June 1, 1987, p. 231-240. Research supported by the National Research
Astronomy and Astrophysics
Astronomy
36
Infrared Sources (Astronomy), Linear Polarization, Pre-Main Sequence Stars, Radio Jets (Astronomy), Stellar Envelopes, T Tauri Stars, Cosmic Dust, Stellar Winds
Scientific paper
Available linear polarization data and information about jets and bipolar outflows observed near T Tauri stars and other young infrared objects are used in conjunction with polarization models to discuss the distribution of circumstellar dust grains around these stars. Two general cases are investigated: (1) axially symmetric distributions of spherical grains and (2) nonspherical grains aligned preferentially in some direction. It is shown that if case 1 is assumed, then one can distinguish between two families of models: (a) where the polarizing dust is distributed in an oblate configuration as in a circumstellar disk around the star and (b) where the dust lies in a prolate configuration as in two oppositely directed jets. If, on the other hand, the polarization is due to linear dichroism instead of scattering (case 2), then asymmetric grains are aligned preferentially perpendicular to the plane of the disk; if the alignment is by a magnetic field, the field is predominantly in the plane of the disk, contrary to some models proposed recently to explain the jets. The distribution of the linear polarization is considered, and also the information on position angles of the polarization and of the jets. Other possible explanations, e.g., with polarization reversals, are discussed and the constraints derived. The data show that both cases considered occur in T Tauri stars, and that in case 1 a prolate configuration for the polarizing dust in the optical is to be preferred.
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