Models for the Formation of Massive Stars

Abstract

The formation of massive stars is currently an unsolved problems in astrophysics. Understanding the formation of massive stars is essential because they dominate the luminous, kinematic, and chemical output of stars. Furthermore, their feedback is likely to play a dominant role in the evolution of molecular clouds and any subsequent star formation therein. Although significant progress has been made observationally and theoretically, we still do not have a consensus as to how massive stars form. There are two contending models to explain the formation of massive stars, Core Accretion and Competitive Accretion. They differ primarily in how and when the mass that ultimately makes up the massive star is gathered. In the core accretion model, the mass is gathered in a prestellar stage due to the overlying pressure of a stellar cluster or a massive pre-cluster cloud clump. In contrast, competitive accretion envisions that the mass is gathered during the star formation process itself, being funneled to the centre of a stellar cluster by the gravitational potential of the stellar cluster. Although these differences may not appear overly significant, they involve significant differences in terms of the physical processes involved. Furthermore, the differences also have important implications in terms of the evolutionary phases of massive star formation, and ultimately that of stellar clusters and star formation on larger scales. Here we review the dominant models, and discuss prospects for developing a better understanding of massive star formation in the future.

25 pages, 4 figures, CUP press format. To be published in "Structure Formation in the Universe", ed. G. Chabrier. This version is has a slightly revised discussion of massive binaries

References in corpus (19)

• Modelling Accretion in Protobinary Systems
• The Formation of a Star Cluster: Predicting the Properties of Stars and Brown Dwarfs
• Competitive accretion in embedded stellar cluster
• On the Formation of Massive Stars
• The hierarchical formation of a stellar cluster
• Massive star formation: Nurture, not nature
• Accretion in stellar clusters and the IMF
• On the Rapid Collapse and Evolution of Molecular Clouds
• Photoionising feedback in star cluster formation
• WR 20a is an Eclipsing Binary: Accurate Determination of Parameters for an Extremely Massive Wolf-Rayet System
• Binary systems and stellar mergers in massive star formation
• The Jeans mass and the origin of the knee in the IMF
• On the Similarity between Cluster and Galactic Stellar Initial Mass Functions
• Clump Lifetimes and the Initial Mass Function
• Fragmentation in Massive Star Formation
• Caught in the act: The Onset of massive star formation
• Precursors of UCHII regions & the evolution of massive outflows
• Dynamical parallax of sigma Ori AB: mass, distance and age
• On the relative motions of dense cores and envelopes in star-forming molecular clouds

Cited by in corpus (2)

• Concurrent formation of supermassive stars and globular clusters: implications for early self-enrichment
• Formation of stellar clusters