Transient Spiral Patterns -- Support from HIPPARCOS

Details Transient Spiral Patterns -- Support from HIPPARCOS Transient Spiral Patterns -- Support from HIPPARCOS

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999dda....31.1301s&link_type=abstract

American Astronomical Society, DDA meeting #31, #13.01

Astronomy and Astrophysics

Astronomy

Scientific paper

A long-standing controversy in theoretical studies of spiral structure has concerned the lifetimes of individual spiral patterns. Much theoretical work has sought quasi-stationary spiral modes while N-body simulations have consistently displayed recurrent, short-lived patterns. The simulations manifest a recurrent cycle of true instabilities related to small-scale features in the angular momentum distribution of particles, with the decay of each instability seeding the growth of the next. Data from the recent HIPPARCOS mission seem to offer support for the recurrent transient picture.

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