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Massive star formation in 100,000 years from turbulent and pressurized molecular clouds

Nature volume 416, pages 59–61 (2002)Cite this article

Abstract

Massive stars (with mass m* > 8 solar masses M⊙) are fundamental to the evolution of galaxies, because they produce heavy elements, inject energy into the interstellar medium, and possibly regulate the star formation rate. The individual star formation time, t*f, determines the accretion rate of the star; the value of the former quantity is currently uncertain by many orders of magnitude1,2,3,4,5,6, leading to other astrophysical questions. For example, the variation of t*f with stellar mass dictates whether massive stars can form simultaneously with low-mass stars in clusters. Here we show that t*f is determined by the conditions in the star's natal cloud, and is typically ∼105 yr. The corresponding mass accretion rate depends on the pressure within the cloud—which we relate to the gas surface density—and on both the instantaneous and final stellar masses. Characteristic accretion rates are sufficient to overcome radiation pressure from ∼100M⊙ protostars, while simultaneously driving intense bipolar gas outflows. The weak dependence of t*f on the final mass of the star allows high- and low-mass star formation to occur nearly simultaneously in clusters.

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Figure 1: Variation of model parameters and results with kρ.
Figure 2: Derived properties of nearby massive protostars.

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Acknowledgements

We thank S. Stahler, R. Pudritz, M. Walmsley and M. Krumholz for discussions. This work was supported by the NSF, by NASA (which supports the Center for Star Formation Studies) and (for J.C.T.) by a Spitzer-Cotsen fellowship from Princeton University.

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Authors and Affiliations

  1. Department of Physics, University of California, Berkeley, 94720, California, USA

    Christopher F. McKee

  2. Department of Astronomy, University of California, Berkeley, 94720, California, USA

    Christopher F. McKee & Jonathan C. Tan

  3. Princeton University Observatory, Peyton Hall, Princeton, 08544, New Jersey, USA

    Jonathan C. Tan

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Correspondence to Christopher F. McKee.

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McKee, C., Tan, J. Massive star formation in 100,000 years from turbulent and pressurized molecular clouds. Nature 416, 59–61 (2002). https://doi.org/10.1038/416059a

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