Stellar Multiplicity and the Initial Mass Function: Most Stars Are Single

@article{Lada2006StellarMA,
  title={Stellar Multiplicity and the Initial Mass Function: Most Stars Are Single},
  author={Charles J. Lada},
  journal={The Astrophysical Journal Letters},
  year={2006},
  volume={640},
  pages={L63 - L66}
}
  • C. Lada
  • Published 17 January 2006
  • Physics, Geology
  • The Astrophysical Journal Letters
In this Letter I compare recent findings suggesting a low binary star fraction for late-type stars with knowledge concerning the forms of the stellar initial and present-day mass functions for masses down to the hydrogen-burning limit. This comparison indicates that most stellar systems formed in the Galaxy are likely single and not binary, as has been often asserted. Indeed, in the current epoch two-thirds of all main-sequence stellar systems in the Galactic disk are composed of single stars… 

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References

SHOWING 1-10 OF 35 REFERENCES

The Luminosity function and stellar evolution

The evolutionary significance of the observed luminosity function for main-sequence stars in the solar neighborhood is discussed. The hypothesis is made that stars move off the main sequence after

The Initial Mass Function of Stars: Evidence for Uniformity in Variable Systems

Combining IMF estimates for different populations in which the stars can be observed individually unveils an extraordinary uniformity of the IMF, which appears to hold for populations including present-day star formation in small molecular clouds.

Multiplicity of Massive Stars

We review the multiplicity of massive stars by compiling the abstracts of the most relevant papers in the field. We start by discussing the massive stars in the Orion Trapezium Cluster and in other

Star Formation in Molecular Clouds: Observation and Theory

Star-formation (SF) processes occurring on the scale of giant molecular clouds (10 to the 6th solar masses and 10 to the 20th cm) or smaller are discussed, reviewing the results of recent theoretical

Galactic Stellar and Substellar Initial Mass Function

We review recent determinations of the present‐day mass function (PDMF) and initial mass function (IMF) in various components of the Galaxy—disk, spheroid, young, and globular clusters—and in

A two-step initial mass function: Consequences of clustered star formation for binary properties

If stars originate in transient bound clusters of moderate size, these clusters will decay due to dynamic interactions in which a hard binary forms and ejects most or all the other stars. When the

The Initial mass function and stellar birthrate in the solar neighborhood

We examine the initial mass function (IMF) and time history of the stellar birthrate in the solar neighborhood assuming a time-independent IMF. The present-day mass function is constructed from the

Inverse dynamical population synthesis and star formation

We investigate the hypothesis that stars form in aggregates of binary systems and that the dynamical evolution of these aggregates leads to the observed properties of binary stars in the Galactic

Planets Orbiting Other Suns

After a century fraught with false claims, evidence for planets around other stars finally appears robust. Infrared imaging and spectroscopy of disks around stars foreshadow detailed models of the

The Luminosity and Mass Function of the Trapezium Cluster: From B Stars to the Deuterium-burning Limit

We use the results of a new multiepoch, multiwavelength, near-infrared census of the Trapezium cluster in Orion to construct and analyze the structure of its infrared (K-band) luminosity function.