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| Format: | Artículo científico |
| Sprache: | en |
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Universidad Nacional Autónoma de México
2002
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| Online-Zugang: | https://www.redalyc.org/articulo.oa?id=57112015 |
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Inhaltsangabe:
- Triggered star formation J. Palou S. Ehlerová Física, Astronomía y Matemáticas HYDRODYNAMICS ISM: STRUCTURE STARS: FORMATION SUPERNOVA REMNANTS GALAXIES: EVOLUTION The star formation triggered in dense walls of expanding shells is discussed. The fragmentation process isstudied using the linear and non-linear perturbation theory. The inuence of the energy input, the ISMdistribution, and the speed of sound is examined analytically and by numerical simulations. We formulatethe condition for the gravitational fragmentation of expanding shells: if the total surface density of the discis higher than a certain critical value, shells are unstable. This value depends on the energy of the shell andthe sound speed in the ISM. As an example the formation of OB associations near the Sun is discussed. Wetrace their orbits in the Milky Way to see where they have been born: 10{12 Myr ago progenitors of theScorpius-Centaurus OB associations and the Orion OB association resided together within a sheet-like regionelongated in the l = 20{200 direction, showing that the local OB associations may be formed as fragmentsof an expanding supershell. 2002 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57112015 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Vol.12