Abstract
This chapter discusses the most important modes that trigger the formation of stars in expanding H ii regions. In Sect. 3.1 we give a brief overview of the observational characteristics that point where and how star formation may be triggered in nebulae. In Sect. 3.2 we describe the very basic physics followed in a gravitationally unstable cloud and in particular we describe the Jeans criterion, Jeans mass and Jeans length that are frequently used in literature. Section 3.3 presents the two dominant hydrodynamical instabilities found in expanding H ii regions and which create the potential sites of triggered star formation. These are the Vishniac instability (Sect. 3.3.1) and the Rayleigh-Taylor instability (Sect. 3.3.2). The two sections that follow up (Sects. 3.4 and 3.5 respectively) discuss the Collect and Collapse mechanism and the radiation-driven implosion mechanism for triggered star formation that are observed in expanding H ii regions. We close this chapter by discussing how our Solar System was formed (Sect. 3.6) as all observational evidence point to the fact that it was closely connected with a massive star that underwent a supernova explosion.
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Notes
- 1.
However, there are some authors who describe this effect as radiation-driven compression.
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Bisbas, T.G. (2016). Triggered Star Formation. In: The Interstellar Medium, Expanding Nebulae and Triggered Star Formation. SpringerBriefs in Astronomy. Springer, Cham. https://doi.org/10.1007/978-3-319-26142-3_3
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