Dynamical population synthesis: Constructing the stellar single and binary contents of galactic field populations

Abstract

[abridged] The galactic field's late-type stellar single and binary population is calculated on the supposition that all stars form as binaries in embedded star clusters. A recently developed tool (Marks, Kroupa & Oh) is used to evolve the binary star distributions in star clusters for a few Myr so that a particular mixture of single and binary stars is achieved. On cluster dissolution the population enters the galactic field with these characteristics. The different contributions of single stars and binaries from individual star clusters which are selected from a power-law embedded star cluster mass function are then added up. This gives rise to integrated galactic field binary distribution functions (IGBDFs) resembling a galactic field's stellar content (Dynamical Population Synthesis). It is found that the binary proportion in the galactic field of a galaxy is larger the lower the minimum cluster mass, the lower the star formation rate, the steeper the embedded star cluster mass function and the larger the typical size of forming star clusters in the considered galaxy. In particular, period-, mass-ratio- and eccentricity IGBDFs for the Milky Way are modelled. The afore mentioned theoretical IGBDFs agree with independently observed distributions. Of all late-type binaries, 50% stem from M<300M_sun clusters, while 50% of all single stars were born in M>10^4M_sun clusters. Comparison of the G-dwarf and M-dwarf binary population indicates that the stars formed in mass-segregated clusters. In particular it is pointed out that although in the present model all M-dwarfs are born in binary systems, in the Milky Way's Galactic field the majority ends up being single stars. This work predicts that today's binary frequency in elliptical galaxies is lower than in spiral and in dwarf-galaxies. The period and mass-ratio distributions in these galaxies are explicitly predicted.

14 pages, 9 figures, accepted for publication in MNRAS

References in corpus (12)

• Stellar Multiplicity and the IMF: Most Stars Are Single
• The present-day star formation rate of the Milky-Way determined from Spitzer detected young stellar objects
• The Importance of Radiative Feedback for the Stellar Initial Mass Function
• The Nature of the Dense Core Population in the Pipe Nebula: Thermal Cores Under Pressure
• The mass function of young star clusters in spiral galaxies
• A Possible Origin of the Mass-Metallicity Relation of Galaxies
• A Spitzer census of the IC 348 nebula
• The distribution of the ISM in the Milky Way A three-dimensional large-scale model
• Diverging UV and Halpha fluxes of star forming galaxies predicted by the IGIMF theory
• The Evolution of the Multiplicity of Embedded Protostars II: Binary Separation Distribution & Analysis
• ACS imaging of star clusters in M51. I. Identification and radius distribution
• Exploring the consequences of pairing algorithms for binary stars

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• Testing the universality of star formation - II. Comparing separation distributions of nearby star-forming regions and the field
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• The statistical properties of early-type stars from LAMOST DR8
• A New Approach to Convective Core Overshooting: Probabilistic Constraints from Color-Magnitude Diagrams of LMC Clusters
• Dynamical equivalence, the origin of the Galactic field stellar and binary population, and the initial radius--mass relation of embedded clusters
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• Binary interactions as a possible scenario for the formation of multiple stellar populations in globular clusters
• Bayesian Approach for Determining Microlens System Properties with High-Angular-Resolution Follow-up Imaging
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• Primordial mass segregation of star clusters with primordial binaries
• Do individual Spitzer young stellar object candidates enclose multiple UKIDSS sources?
• A possible solution to the Milky Way's binary-deficient retrograde stellar population. Evidence that $\omega$ Centauri has formed in an extreme starburst
• GeMS in the Outer Galaxy: Near-Infrared Imaging of Three Young Clusters at Large Galactic Radii
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