Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003ala..conf..143a&link_type=abstract
Astronomy in Latin America, Second Meeting on Astrometry in Latin America and Third Brazilian Meeting on Fundamental Astronomy,
Astronomy and Astrophysics
Astronomy
1
Scientific paper
We present data, collected from the literature, for a group of earlytype stars which are presently situated at large distances from the galactic plane; for this group of stars the evidence of youth seems convincing. We discuss two possible formation mechanisms for these stars: ejection from the plane by dynamical interactions within small young clusters, and formation away from the plane, as a result of induced shocks created by spiral density waves. Times of flight are computed from the numerically integrated galactic orbits of the stars. By means of a study of their galactic orbits, we identify the stars that could be explained by these mechanisms. We conclude that the ejection mechanism can account for about two thirds of the stars, while a combination of star formation at z = 500-800 pc from the plane, plus ejection, can account for 90 percent of the stars. Neither mechanism, nor a combination of both, can explain the most extreme examples.
Allen Christine
Kinman Thomas D.
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