Grain Alignment and Crossover Events

Details Grain Alignment and Crossover Events Grain Alignment and Crossover Events

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...189.1603l&link_type=abstract

American Astronomical Society, 189th AAS Meeting, #16.03; Bulletin of the American Astronomical Society, Vol. 28, p.1294

Astronomy and Astrophysics

Astronomy

Scientific paper

We discuss the dynamics of grains subjected to uncompensated torques. In particular, we discuss grain dynamics when a grain spins down and goes through a crossover. We calculate the degree of correlation for the grain angular momentum before and after a crossover and quantitatively discuss how this correlation affects grain alignment. We show that thermal fluctuations within the grain material limit the degree to which the grain angular momentum is coupled with the grain principal axis of maximal inertia. We find that this imperfect coupling plays a critical role during crossovers and increases substantially the efficiency of paramagnetic alignment. We also discuss the role of crossovers for mechanical alignment and for the alignment by radiative torques.

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