Young stars at large distances from the galactic plane: mechanisms of formation

Details Young stars at large distances from the galactic plane: mechanisms of formation Young stars at large distances from the galactic plane: mechanisms of formation

2002-12-11

arxiv.org/abs/astro-ph/0212272v1

Astronomy and Astrophysics

Astrophysics

6 pages, No figures. Sixth Pacific Rim Conference on Stellar Astrophysics - A tribute to Helmut Abt, (Kluwer)

Scientific paper

We have collected from the literature a list of early-type stars, situated at large distances from the galactic plane, for which evidence of youth seems convincing. We discuss two possible formation mechanisms for these stars: ejection from the plane by dynamical interactions within small clusters, and formation away from the plane, via induced shocks created by spiral density waves. We identify the stars that could be explained by each mechanism. 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 and ejection, can account for 90 percent of these stars. Neither mechanism, nor both together, can explain the most extreme examples.

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