The Long-term Evolution of Main-sequence Binaries in DRAGON Simulations

Abstract We present a comprehensive investigation of main-sequence binaries in the DRAGON simulations, which are first one-million-particle direct N -body simulations globular clusters. analyze orbital parameters binary samples two D1-R7-IMF93 and D2-R7-IMF01, focusing on their secular evolution correlations up to 12 Gyr. These models have different initial stellar mass functions: Kroupa 1993 (D1-R7-IMF93) 2001 (D2-R7-IMF01); mass-ratio distributions: random paring power law (D1-R7-IMF93). In general, ratio population increases over time due evolution, is less significant D2-R7-IMF01. D1-R7-IMF93, primordial with q ≈ 0.2 most common, frequency linearly declines increasing at all times. Dynamical both higher eccentricities larger semimajor axes than binaries. They preferentially located inner part star cluster. Secular does not depend distribution, but sensitive distribution system. At t = Gyr, fraction decreases radially outwards, segregation present. A color difference 0.1 mag F330W − F814W NUV y between core outskirts clusters seen, reflection radial The complete set data for dynamical systems snapshot intervals made publicly available.