Other
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000dda....31.1005f&link_type=abstract
American Astronomical Society, DDA Meeting #31, #10.05; Bulletin of the American Astronomical Society, Vol. 32, p.866
Other
Scientific paper
Resonance rings of star formation are a common phenomenon of early type barred spiral galaxies. Rings form by gas cloud gravitational coelesence near resonances with a turning perturbation. The resulting bright stars trace out the rings. We show how to use the Byrd et al. (1998) analytic formulation to model two-fold resonance rings with an example, NGC 3081. We obtain bar strength, orientation, and pattern speed reproducing the observed shapes and radial velocities. We show that an additional type, a one-fold resonance ring, can be produced by lop-sided perturbations. We identify shape, star formation, and velocity signatures of one-fold versus two-fold rings. As an example, we model the one-fold ring of NGC 4622. We study star formation in rings in more detail. Age of associations can be predicted as a function of angle around the ring. Correlating with observed colors or other age indicators permits empirical calibration of the indicator to study star formation and the ages of stellar complexes in other galaxies. Acknowledgements: T. Freeman and G. Byrd were supported by NSF grant 9802918. D. Ousley was supported by a Univerisyt of Alabama Mc Wane Undergraduate Research Fellowship. We thank R. But and G. Purcell for observational data on NGC 3081.
Byrd Gene Gilbert
Domingue Donovan
Freeman Tarsh
Ousley Derrick
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