Completing the Massive Star Population: Striking Into the Field

Details Completing the Massive Star Population: Striking Into the Field Completing the Massive Star Population: Striking Into the Field

2011-09-04

arxiv.org/abs/1109.0759v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

Invited review to appear in Four Decades of Research on Massive Stars, eds. L. Drissen, C. Robert, and N. St-Louis, ASP Confer

Scientific paper

As a population, field massive stars are relatively enigmatic, and this review attempts to illuminate this sector of the high-mass stellar population, which comprises 20 - 25% of the massive stars in star-forming galaxies. The statistical properties of the field population are vital diagnostics of star formation theory, cluster dynamical evolution, and stellar evolution. We present evidence that field massive stars originate both in situ and as runaways from clusters, based on the clustering law, IMF, rotation velocities, and individual observed in situ candidate field stars. We compare the known properties of field and cluster massive stars from studies in the Magellanic Clouds and the Galaxy, including our RIOTS4 complete spectroscopic survey of SMC OB stars. In addition to the origin of the field massive stars, we discuss additional properties including binarity, runaway mechanisms, and some evolved spectral types.

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